{"id":53174,"date":"2026-05-15T07:26:18","date_gmt":"2026-05-15T07:26:18","guid":{"rendered":"https:\/\/zobai.com\/?page_id=53174"},"modified":"2026-05-15T07:28:19","modified_gmt":"2026-05-15T07:28:19","slug":"high-back-pressure","status":"publish","type":"page","link":"https:\/\/zobai.com\/de\/applications\/high-back-pressure\/","title":{"rendered":"Hoher Gegendruck"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"53174\" class=\"elementor elementor-53174\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-709fc1ee e-con-full e-flex cmsmasters-bg-hide-none cmsmasters-bg-hide-none cmsmasters-block-default e-con e-parent\" data-id=\"709fc1ee\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-89ee4e8 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"89ee4e8\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1b72728f cmsmasters-breadcrumbs-alignment-left cmsmasters-breadcrumbs-type-rank cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-cmsmasters-breadcrumbs cmsmasters-widget-breadcrumbs\" data-id=\"1b72728f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"cmsmasters-breadcrumbs.default\">\n\t\t\t\t\t<div class=\"cmsmasters-widget-breadcrumbs__container\"><div class=\"cmsmasters-widget-breadcrumbs__content\"><nav aria-label=\"breadcrumbs\" class=\"rank-math-breadcrumb\"><p><span class=\"last\">Home<\/span><\/p><\/nav><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-71bbac68 elementor-widget__width-initial cmsmasters-block-default cmsmasters-sticky-default elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"71bbac68\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;cmsmasters-fade-in-up&quot;,&quot;_animation_delay&quot;:150}\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">High Back Pressure Safety Valves for Flare, Scrubber, Closed Vent and Return Line Systems<\/h1>\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4b0b6d76 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"4b0b6d76\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-96ade77 cmsmasters-button-mobile-align-center cmsmasters-icon-arrangement-together cmsmasters-block-default cmsmasters-sticky-default elementor-invisible elementor-widget elementor-widget-cmsmasters-button\" data-id=\"96ade77\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;cmsmasters-pop-in&quot;,&quot;_animation_delay&quot;:300}\" data-widget_type=\"cmsmasters-button.default\">\n\t\t\t\t\t<div class=\"elementor-widget-cmsmasters-button__button-container\"><div class=\"elementor-widget-cmsmasters-button__button-container-inner\"><a href=\"https:\/\/zobai.com\/de\/?page_id=48437\" class=\"cmsmasters-button-link elementor-widget-cmsmasters-button__button cmsmasters-icon-view-default cmsmasters-icon-shape- cmsmasters-button-size-sm\" role=\"button\" tabindex=\"0\"><span class=\"elementor-widget-cmsmasters-button__content-wrapper cmsmasters-align-icon-right\"><span class=\"elementor-widget-cmsmasters-button__icon\"><i aria-hidden=\"true\" class=\"cmsmsdemo-icon- cmsms-demo-icon-arrows-1\"><\/i><\/span><span class=\"elementor-widget-cmsmasters-button__text\">CONTACT SALES<\/span><\/span><\/a><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-44b20853 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"44b20853\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-25321c09 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"25321c09\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5c2d03dc e-con-full cmsmasters-effect cmsmasters-effect-type-transform e-flex cmsmasters-effect-hover-type-element cmsmasters-block-default e-con e-child\" data-id=\"5c2d03dc\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;position&quot;:&quot;absolute&quot;,&quot;cms_transform_hover_type&quot;:&quot;element&quot;}\">\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7051652c e-con-full e-flex cmsmasters-block-default e-con e-parent\" data-id=\"7051652c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6b922d1f cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-html\" data-id=\"6b922d1f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t\t<style>\r\n  .zobai-hbp-page {\r\n    --z-green: #0fad87;\r\n    --z-green-dark: #087761;\r\n    --z-ink: #20242a;\r\n    --z-muted: #66727f;\r\n    --z-bg: #f3f4f5;\r\n    --z-card: #ffffff;\r\n    --z-line: #e3e8ec;\r\n    --z-soft: #eef8f5;\r\n    --z-dark: #102522;\r\n    --z-radius: 22px;\r\n    font-family: inherit;\r\n    color: var(--z-ink);\r\n    background: var(--z-bg);\r\n  }\r\n\r\n  .zobai-hbp-page * {\r\n    box-sizing: border-box;\r\n  }\r\n\r\n  .zobai-hbp-section {\r\n    max-width: 100%;\r\n    margin: 0 auto;\r\n    padding: 88px 80px;\r\n  }\r\n\r\n  .zobai-hbp-section-soft {\r\n    background: #f8faf9;\r\n  }\r\n\r\n  .zobai-hbp-eyebrow {\r\n    display: inline-flex;\r\n    align-items: center;\r\n    gap: 8px;\r\n    color: var(--z-green);\r\n    font-size: 13px;\r\n    font-weight: 800;\r\n    letter-spacing: 0.14em;\r\n    text-transform: uppercase;\r\n    margin-bottom: 18px;\r\n  }\r\n\r\n  .zobai-hbp-eyebrow:before {\r\n    content: \"\u203a\u203a\u203a\";\r\n    color: var(--z-green);\r\n    font-size: 20px;\r\n    letter-spacing: -2px;\r\n  }\r\n\r\n  .zobai-hbp-title {\r\n    font-size: clamp(34px, 5vw, 76px);\r\n    line-height: 1.04;\r\n    letter-spacing: -0.04em;\r\n    margin: 0 0 26px;\r\n    color: var(--z-ink);\r\n    max-width: 1120px;\r\n  }\r\n\r\n  .zobai-hbp-lead {\r\n    font-size: clamp(17px, 1.5vw, 21px);\r\n    line-height: 1.75;\r\n    color: #35404a;\r\n    max-width: 1120px;\r\n    margin: 0 0 34px;\r\n  }\r\n\r\n  .zobai-hbp-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(12, 1fr);\r\n    gap: 28px;\r\n  }\r\n\r\n  .zobai-hbp-span-4 { grid-column: span 4; }\r\n  .zobai-hbp-span-5 { grid-column: span 5; }\r\n  .zobai-hbp-span-6 { grid-column: span 6; }\r\n  .zobai-hbp-span-7 { grid-column: span 7; }\r\n  .zobai-hbp-span-12 { grid-column: span 12; }\r\n\r\n  .zobai-hbp-card,\r\n  .zobai-hbp-case {\r\n    background: var(--z-card);\r\n    border: 1px solid var(--z-line);\r\n    border-radius: var(--z-radius);\r\n    padding: 30px;\r\n    box-shadow: 0 14px 38px rgba(18, 31, 42, 0.06);\r\n  }\r\n\r\n  .zobai-hbp-card h2,\r\n  .zobai-hbp-card h3,\r\n  .zobai-hbp-case h3 {\r\n    margin: 0 0 14px;\r\n    color: var(--z-ink);\r\n  }\r\n\r\n  .zobai-hbp-card h3,\r\n  .zobai-hbp-case h3 {\r\n    font-size: 24px;\r\n    line-height: 1.25;\r\n  }\r\n\r\n  .zobai-hbp-card p,\r\n  .zobai-hbp-case p {\r\n    font-size: 16px;\r\n    line-height: 1.72;\r\n    color: #48525d;\r\n    margin: 0 0 16px;\r\n  }\r\n\r\n  .zobai-hbp-card p:last-child,\r\n  .zobai-hbp-case p:last-child {\r\n    margin-bottom: 0;\r\n  }\r\n\r\n  .zobai-hbp-hero-panel {\r\n    background: linear-gradient(135deg, #09201d 0%, #0b3c34 48%, #0f8a6d 100%);\r\n    border-radius: 34px;\r\n    color: #fff;\r\n    padding: 50px;\r\n    position: relative;\r\n    overflow: hidden;\r\n  }\r\n\r\n  .zobai-hbp-hero-panel:after {\r\n    content: \"\";\r\n    position: absolute;\r\n    width: 360px;\r\n    height: 360px;\r\n    border-radius: 50%;\r\n    right: -150px;\r\n    top: -170px;\r\n    background: rgba(255,255,255,0.08);\r\n  }\r\n\r\n  .zobai-hbp-hero-panel h2 {\r\n    color: #fff;\r\n    font-size: clamp(34px, 4.6vw, 66px);\r\n    line-height: 1.06;\r\n    letter-spacing: -0.04em;\r\n    margin: 0 0 22px;\r\n    position: relative;\r\n    z-index: 1;\r\n  }\r\n\r\n  .zobai-hbp-hero-panel p {\r\n    color: rgba(255,255,255,0.88);\r\n    line-height: 1.75;\r\n    font-size: 18px;\r\n    max-width: 980px;\r\n    margin: 0;\r\n    position: relative;\r\n    z-index: 1;\r\n  }\r\n\r\n  .zobai-hbp-kpi {\r\n    display: grid;\r\n    grid-template-columns: repeat(4, 1fr);\r\n    gap: 14px;\r\n    margin-top: 34px;\r\n    position: relative;\r\n    z-index: 1;\r\n  }\r\n\r\n  .zobai-hbp-kpi-item {\r\n    border: 1px solid rgba(255,255,255,0.18);\r\n    background: rgba(255,255,255,0.08);\r\n    border-radius: 20px;\r\n    padding: 22px;\r\n  }\r\n\r\n  .zobai-hbp-kpi-item strong {\r\n    display: block;\r\n    color: #a9f4df;\r\n    font-size: 13px;\r\n    letter-spacing: 0.08em;\r\n    text-transform: uppercase;\r\n    margin-bottom: 10px;\r\n  }\r\n\r\n  .zobai-hbp-kpi-item span {\r\n    display: block;\r\n    color: #fff;\r\n    font-size: 20px;\r\n    line-height: 1.28;\r\n    font-weight: 850;\r\n  }\r\n\r\n  .zobai-hbp-flow {\r\n    display: grid;\r\n    gap: 16px;\r\n    margin-top: 28px;\r\n  }\r\n\r\n  .zobai-hbp-flow-item {\r\n    display: grid;\r\n    grid-template-columns: 90px 1fr;\r\n    gap: 20px;\r\n    background: #fff;\r\n    border: 1px solid var(--z-line);\r\n    border-radius: 22px;\r\n    padding: 24px;\r\n    box-shadow: 0 12px 30px rgba(18, 31, 42, 0.04);\r\n  }\r\n\r\n  .zobai-hbp-flow-num {\r\n    width: 64px;\r\n    height: 64px;\r\n    border-radius: 18px;\r\n    background: var(--z-soft);\r\n    color: var(--z-green-dark);\r\n    display: flex;\r\n    align-items: center;\r\n    justify-content: center;\r\n    font-size: 22px;\r\n    font-weight: 900;\r\n  }\r\n\r\n  .zobai-hbp-flow-item h3 {\r\n    margin: 0 0 8px;\r\n    font-size: 24px;\r\n    color: var(--z-ink);\r\n  }\r\n\r\n  .zobai-hbp-flow-item p {\r\n    margin: 0;\r\n    color: #4d5863;\r\n    line-height: 1.68;\r\n  }\r\n\r\n  .zobai-hbp-table-wrap {\r\n    overflow-x: auto;\r\n    border-radius: 20px;\r\n    border: 1px solid var(--z-line);\r\n    background: #fff;\r\n    box-shadow: 0 14px 34px rgba(18, 31, 42, 0.04);\r\n  }\r\n\r\n  .zobai-hbp-table {\r\n    width: 100%;\r\n    border-collapse: collapse;\r\n    min-width: 980px;\r\n    font-size: 15px;\r\n  }\r\n\r\n  .zobai-hbp-table th {\r\n    background: #102522;\r\n    color: #fff;\r\n    padding: 17px 18px;\r\n    text-align: left;\r\n    font-weight: 850;\r\n    white-space: nowrap;\r\n  }\r\n\r\n  .zobai-hbp-table td {\r\n    padding: 17px 18px;\r\n    border-bottom: 1px solid var(--z-line);\r\n    color: #3d4953;\r\n    vertical-align: top;\r\n    line-height: 1.55;\r\n  }\r\n\r\n  .zobai-hbp-table tr:nth-child(even) td {\r\n    background: #fbfcfc;\r\n  }\r\n\r\n  .zobai-hbp-table tr:last-child td {\r\n    border-bottom: 0;\r\n  }\r\n\r\n  .zobai-hbp-list {\r\n    display: grid;\r\n    gap: 12px;\r\n    margin: 20px 0 0;\r\n    padding: 0;\r\n    list-style: none;\r\n  }\r\n\r\n  .zobai-hbp-list li {\r\n    position: relative;\r\n    padding-left: 30px;\r\n    color: #48525d;\r\n    line-height: 1.62;\r\n  }\r\n\r\n  .zobai-hbp-list li:before {\r\n    content: \"\u2713\";\r\n    position: absolute;\r\n    left: 0;\r\n    top: 0;\r\n    color: var(--z-green);\r\n    font-weight: 900;\r\n  }\r\n\r\n  .zobai-hbp-case {\r\n    border-radius: 24px;\r\n    padding: 28px;\r\n  }\r\n\r\n  .zobai-hbp-case-top {\r\n    display: flex;\r\n    justify-content: space-between;\r\n    gap: 16px;\r\n    align-items: flex-start;\r\n    margin-bottom: 18px;\r\n  }\r\n\r\n  .zobai-hbp-case-tag {\r\n    display: inline-flex;\r\n    align-items: center;\r\n    white-space: nowrap;\r\n    border-radius: 999px;\r\n    background: var(--z-soft);\r\n    color: var(--z-green-dark);\r\n    padding: 8px 12px;\r\n    font-size: 13px;\r\n    font-weight: 850;\r\n  }\r\n\r\n  .zobai-hbp-case-data {\r\n    display: grid;\r\n    grid-template-columns: repeat(2, 1fr);\r\n    gap: 10px 18px;\r\n    margin: 18px 0;\r\n    padding: 18px;\r\n    border-radius: 18px;\r\n    background: #f8fbfa;\r\n    border: 1px solid #dcebe7;\r\n  }\r\n\r\n  .zobai-hbp-case-data div {\r\n    color: #42505b;\r\n    line-height: 1.5;\r\n    font-size: 14px;\r\n  }\r\n\r\n  .zobai-hbp-case-data b {\r\n    color: var(--z-ink);\r\n  }\r\n\r\n  .zobai-hbp-chip-row {\r\n    display: flex;\r\n    flex-wrap: wrap;\r\n    gap: 10px;\r\n    margin-top: 22px;\r\n  }\r\n\r\n  .zobai-hbp-chip {\r\n    display: inline-flex;\r\n    align-items: center;\r\n    border: 1px solid #cde6df;\r\n    background: #f5fffb;\r\n    color: #0a6d5b;\r\n    border-radius: 999px;\r\n    padding: 9px 14px;\r\n    font-size: 14px;\r\n    font-weight: 700;\r\n  }\r\n\r\n  .zobai-hbp-link-grid {\r\n    display: grid;\r\n    grid-template-columns: repeat(3, 1fr);\r\n    gap: 14px;\r\n    margin-top: 24px;\r\n  }\r\n\r\n  .zobai-hbp-link-card {\r\n    display: block;\r\n    text-decoration: none;\r\n    background: #fff;\r\n    border: 1px solid var(--z-line);\r\n    border-radius: 18px;\r\n    padding: 20px;\r\n    transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;\r\n  }\r\n\r\n  .zobai-hbp-link-card:hover {\r\n    transform: translateY(-2px);\r\n    border-color: #a7ded1;\r\n    box-shadow: 0 14px 34px rgba(18,31,42,0.08);\r\n  }\r\n\r\n  .zobai-hbp-link-card strong {\r\n    display: block;\r\n    color: var(--z-ink);\r\n    font-size: 17px;\r\n    margin-bottom: 8px;\r\n  }\r\n\r\n  .zobai-hbp-link-card span {\r\n    display: block;\r\n    color: #5d6873;\r\n    line-height: 1.55;\r\n    font-size: 14px;\r\n  }\r\n\r\n  .zobai-hbp-accordion {\r\n    display: grid;\r\n    gap: 14px;\r\n  }\r\n\r\n  .zobai-hbp-acc-item {\r\n    background: #fff;\r\n    border: 1px solid var(--z-line);\r\n    border-radius: 18px;\r\n    overflow: hidden;\r\n  }\r\n\r\n  .zobai-hbp-acc-btn {\r\n    width: 100%;\r\n    border: 0;\r\n    background: #fff;\r\n    padding: 22px 24px;\r\n    display: flex;\r\n    justify-content: space-between;\r\n    align-items: center;\r\n    text-align: left;\r\n    cursor: pointer;\r\n    color: var(--z-ink);\r\n    font-size: 18px;\r\n    font-weight: 850;\r\n  }\r\n\r\n  .zobai-hbp-acc-btn span {\r\n    width: 34px;\r\n    height: 34px;\r\n    border-radius: 50%;\r\n    background: var(--z-soft);\r\n    color: var(--z-green-dark);\r\n    display: inline-flex;\r\n    align-items: center;\r\n    justify-content: center;\r\n    flex: 0 0 34px;\r\n    margin-left: 16px;\r\n    transition: transform 0.2s ease;\r\n  }\r\n\r\n  .zobai-hbp-acc-item.is-open .zobai-hbp-acc-btn span {\r\n    transform: rotate(45deg);\r\n  }\r\n\r\n  .zobai-hbp-acc-body {\r\n    display: none;\r\n    padding: 0 24px 24px;\r\n    color: #4a5661;\r\n    line-height: 1.72;\r\n    font-size: 16px;\r\n  }\r\n\r\n  .zobai-hbp-acc-item.is-open .zobai-hbp-acc-body {\r\n    display: block;\r\n  }\r\n\r\n  .zobai-hbp-rfq {\r\n    background: linear-gradient(135deg, #09201d 0%, #0d6f5d 100%);\r\n    border-radius: 34px;\r\n    padding: 48px;\r\n    color: #fff;\r\n    display: grid;\r\n    grid-template-columns: 1.05fr 0.95fr;\r\n    gap: 36px;\r\n    align-items: center;\r\n  }\r\n\r\n  .zobai-hbp-rfq h2 {\r\n    font-size: clamp(32px, 4vw, 56px);\r\n    line-height: 1.08;\r\n    letter-spacing: -0.04em;\r\n    color: #fff;\r\n    margin: 0 0 18px;\r\n  }\r\n\r\n  .zobai-hbp-rfq p {\r\n    color: rgba(255,255,255,0.86);\r\n    line-height: 1.72;\r\n    font-size: 17px;\r\n    margin: 0 0 24px;\r\n  }\r\n\r\n  .zobai-hbp-rfq-box {\r\n    background: rgba(255,255,255,0.10);\r\n    border: 1px solid rgba(255,255,255,0.18);\r\n    border-radius: 24px;\r\n    padding: 26px;\r\n  }\r\n\r\n  .zobai-hbp-rfq-box h3 {\r\n    color: #fff;\r\n    font-size: 22px;\r\n    margin: 0 0 16px;\r\n  }\r\n\r\n  .zobai-hbp-rfq-grid {\r\n    display: grid;\r\n    grid-template-columns: 1fr 1fr;\r\n    gap: 10px;\r\n  }\r\n\r\n  .zobai-hbp-rfq-item {\r\n    background: rgba(255,255,255,0.10);\r\n    border-radius: 14px;\r\n    padding: 12px 14px;\r\n    color: rgba(255,255,255,0.92);\r\n    font-size: 14px;\r\n    font-weight: 700;\r\n  }\r\n\r\n  .zobai-hbp-btn-row {\r\n    display: flex;\r\n    flex-wrap: wrap;\r\n    gap: 14px;\r\n  }\r\n\r\n  .zobai-hbp-btn {\r\n    display: inline-flex;\r\n    align-items: center;\r\n    justify-content: center;\r\n    min-height: 48px;\r\n    border-radius: 12px;\r\n    padding: 0 22px;\r\n    text-decoration: none;\r\n    font-weight: 850;\r\n    transition: transform 0.18s ease, opacity 0.18s ease;\r\n  }\r\n\r\n  .zobai-hbp-btn:hover {\r\n    transform: translateY(-2px);\r\n    opacity: 0.92;\r\n  }\r\n\r\n  .zobai-hbp-btn-primary {\r\n    background: #ffc400;\r\n    color: #18201f;\r\n  }\r\n\r\n  .zobai-hbp-btn-secondary {\r\n    background: rgba(255,255,255,0.12);\r\n    color: #fff;\r\n    border: 1px solid rgba(255,255,255,0.32);\r\n  }\r\n\r\n  .zobai-hbp-note {\r\n    margin-top: 18px;\r\n    color: #66727f;\r\n    font-size: 14px;\r\n    line-height: 1.6;\r\n  }\r\n\r\n  @media (max-width: 1024px) {\r\n    .zobai-hbp-span-4,\r\n    .zobai-hbp-span-5,\r\n    .zobai-hbp-span-6,\r\n    .zobai-hbp-span-7,\r\n    .zobai-hbp-span-12 {\r\n      grid-column: span 12;\r\n    }\r\n\r\n    .zobai-hbp-kpi,\r\n    .zobai-hbp-link-grid {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .zobai-hbp-rfq {\r\n      grid-template-columns: 1fr;\r\n    }\r\n  }\r\n\r\n  @media (max-width: 640px) {\r\n    .zobai-hbp-section {\r\n      padding: 58px 18px;\r\n    }\r\n\r\n    .zobai-hbp-card,\r\n    .zobai-hbp-hero-panel,\r\n    .zobai-hbp-rfq,\r\n    .zobai-hbp-case {\r\n      padding: 26px 20px;\r\n      border-radius: 24px;\r\n    }\r\n\r\n    .zobai-hbp-flow-item {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .zobai-hbp-case-top {\r\n      flex-direction: column;\r\n    }\r\n\r\n    .zobai-hbp-case-data {\r\n      grid-template-columns: 1fr;\r\n    }\r\n\r\n    .zobai-hbp-rfq-grid {\r\n      grid-template-columns: 1fr;\r\n    }\r\n  }\r\n<\/style>\r\n\r\n<div class=\"zobai-hbp-page\">\r\n\r\n  <section class=\"zobai-hbp-section\">\r\n    <div class=\"zobai-hbp-hero-panel\">\r\n      <div class=\"zobai-hbp-eyebrow\">High Back Pressure Service<\/div>\r\n      <h2>High Back Pressure Safety Valves for Flare Headers, Scrubbers, Closed Vents and Return Lines<\/h2>\r\n      <p>\r\n        High back pressure safety valves protect pressure vessels, reactors, compressors, heat exchangers, storage vessels, pipelines and skid systems when the PSV outlet discharges into a pressurized or variable-pressure system. Correct selection starts with set pressure, required capacity, superimposed back pressure, built-up back pressure, total back pressure, constant or variable outlet pressure, medium phase, relieving temperature, allowable overpressure, discharge header design, flare or scrubber pressure drop, material compatibility and valve type selection between conventional spring-loaded, balanced bellows and pilot operated safety valves.\r\n      <\/p>\r\n\r\n      <div class=\"zobai-hbp-kpi\">\r\n        <div class=\"zobai-hbp-kpi-item\">\r\n          <strong>Core Systems<\/strong>\r\n          <span>Flare headers, scrubbers, closed vents, vapor recovery and liquid return lines<\/span>\r\n        <\/div>\r\n        <div class=\"zobai-hbp-kpi-item\">\r\n          <strong>Key Review<\/strong>\r\n          <span>Superimposed, built-up and total back pressure under relieving conditions<\/span>\r\n        <\/div>\r\n        <div class=\"zobai-hbp-kpi-item\">\r\n          <strong>Valve Options<\/strong>\r\n          <span>Conventional PSV, bellows balanced PSV and pilot operated safety valve<\/span>\r\n        <\/div>\r\n        <div class=\"zobai-hbp-kpi-item\">\r\n          <strong>RFQ Output<\/strong>\r\n          <span>Datasheet, sizing basis, back pressure data, drawings and test records<\/span>\r\n        <\/div>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"zobai-hbp-section zobai-hbp-section-soft\">\r\n    <div class=\"zobai-hbp-eyebrow\">High Back Pressure Applications<\/div>\r\n    <h2 class=\"zobai-hbp-title\">Where High Back Pressure Safety Valves Are Used<\/h2>\r\n    <p class=\"zobai-hbp-lead\">\r\n      High back pressure service appears whenever the valve outlet cannot freely discharge to atmosphere. The outlet pressure may already exist before the valve opens, or it may build up during relief because of discharge piping, flare header load, scrubber pressure drop, vapor recovery pressure or liquid return resistance.\r\n    <\/p>\r\n\r\n    <div class=\"zobai-hbp-grid\">\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-4\">\r\n        <h3>Flare Header Relief Systems<\/h3>\r\n        <p>\r\n          Used in refineries, petrochemical plants, LNG terminals, gas plants and offshore facilities. Multiple PSVs may discharge into one flare header, creating variable back pressure during simultaneous relief or system depressuring.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-4\">\r\n        <h3>Scrubber and Absorber Discharge<\/h3>\r\n        <p>\r\n          Used for toxic, acid gas, chlorine, ammonia, solvent vapor and corrosive gas relief. Scrubber liquid level, packing pressure drop, demister fouling and emergency flow can increase back pressure at the PSV outlet.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-4\">\r\n        <h3>Closed Vent and Vapor Recovery Lines<\/h3>\r\n        <p>\r\n          Used where emissions, flammable vapor or toxic gas cannot be released directly to atmosphere. Valve selection should review normal header pressure, upset pressure, condensation, liquid pockets and header capacity.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-4\">\r\n        <h3>Liquid Return and Closed Drain Systems<\/h3>\r\n        <p>\r\n          Used on pump discharge relief, thermal relief, chemical dosing skids, LPG return lines and liquid transfer packages. Return line static head, tank pressure and friction loss can create back pressure.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-4\">\r\n        <h3>Compressor and Gas Skid Relief<\/h3>\r\n        <p>\r\n          Used on compressor discharge, interstage bottles, fuel gas skids, hydrogen skids and pressure reducing stations. Header pressure and pulsation can affect valve stability, leakage and reseating.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-4\">\r\n        <h3>Reactor and Chemical Relief Systems<\/h3>\r\n        <p>\r\n          Used when reactor PSVs discharge to condenser, quench tank, scrubber, flare or closed collection. Two-phase flow, foaming, fouling and variable back pressure must be reviewed together.\r\n        <\/p>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"zobai-hbp-section\">\r\n    <div class=\"zobai-hbp-eyebrow\">Back Pressure Fundamentals<\/div>\r\n    <h2 class=\"zobai-hbp-title\">Back Pressure Must Be Defined Before Choosing the Valve Type<\/h2>\r\n    <p class=\"zobai-hbp-lead\">\r\n      The same set pressure and capacity can require different valve constructions depending on outlet pressure behavior. Before selecting a conventional, bellows balanced or pilot operated valve, the back pressure should be separated into superimposed, built-up and total back pressure.\r\n    <\/p>\r\n\r\n    <div class=\"zobai-hbp-flow\">\r\n      <div class=\"zobai-hbp-flow-item\">\r\n        <div class=\"zobai-hbp-flow-num\">01<\/div>\r\n        <div>\r\n          <h3>Superimposed Back Pressure<\/h3>\r\n          <p>\r\n            Superimposed back pressure exists at the valve outlet before the valve opens. It can be constant, such as a stable closed header pressure, or variable, such as a flare header pressure that changes with other relieving devices.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-flow-item\">\r\n        <div class=\"zobai-hbp-flow-num\">02<\/div>\r\n        <div>\r\n          <h3>Built-Up Back Pressure<\/h3>\r\n          <p>\r\n            Built-up back pressure is generated after the valve opens because flow passes through the outlet pipe, discharge header, silencer, scrubber, flare line, return line or treatment system. It increases with relieving flow.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-flow-item\">\r\n        <div class=\"zobai-hbp-flow-num\">03<\/div>\r\n        <div>\r\n          <h3>Total Back Pressure<\/h3>\r\n          <p>\r\n            Total back pressure is the combination of superimposed back pressure and built-up back pressure under relieving conditions. This value is central to valve capacity correction and valve type selection.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-flow-item\">\r\n        <div class=\"zobai-hbp-flow-num\">04<\/div>\r\n        <div>\r\n          <h3>Constant vs Variable Back Pressure<\/h3>\r\n          <p>\r\n            Constant back pressure can often be corrected in set pressure or valve configuration. Variable back pressure is more difficult because it changes during plant upset, multi-valve relief, flare load or scrubber operation.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-flow-item\">\r\n        <div class=\"zobai-hbp-flow-num\">05<\/div>\r\n        <div>\r\n          <h3>Capacity and Stability Impact<\/h3>\r\n          <p>\r\n            High back pressure can reduce effective capacity, delay opening, affect blowdown, cause instability or prevent proper reseating. The discharge system must be reviewed as part of the relief valve selection.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-flow-item\">\r\n        <div class=\"zobai-hbp-flow-num\">06<\/div>\r\n        <div>\r\n          <h3>Valve Type Decision<\/h3>\r\n          <p>\r\n            Conventional spring-loaded valves are sensitive to back pressure. Balanced bellows valves reduce back pressure effect on opening pressure and capacity. Pilot operated valves may be suitable for higher back pressure or tight operating margins when service conditions allow.\r\n          <\/p>\r\n        <\/div>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"zobai-hbp-section zobai-hbp-section-soft\">\r\n    <div class=\"zobai-hbp-eyebrow\">Application Case Data<\/div>\r\n    <h2 class=\"zobai-hbp-title\">High Back Pressure Safety Valve Application Cases with Typical RFQ Data<\/h2>\r\n    <p class=\"zobai-hbp-lead\">\r\n      These cases show how high back pressure PSV requirements are commonly described before model selection. Final sizing must be confirmed by process conditions, relief calculation, outlet system data, project standard and engineering review.\r\n    <\/p>\r\n\r\n    <div class=\"zobai-hbp-grid\">\r\n      <div class=\"zobai-hbp-case zobai-hbp-span-6\">\r\n        <div class=\"zobai-hbp-case-top\">\r\n          <h3>Case 1: Refinery Vessel PSV Discharging to Flare Header<\/h3>\r\n          <span class=\"zobai-hbp-case-tag\">Variable Flare Back Pressure<\/span>\r\n        <\/div>\r\n        <div class=\"zobai-hbp-case-data\">\r\n          <div><b>Protected equipment:<\/b> Hydrocarbon pressure vessel<\/div>\r\n          <div><b>Medium:<\/b> Hydrocarbon vapor<\/div>\r\n          <div><b>Set pressure:<\/b> 16 barg<\/div>\r\n          <div><b>Relief cause:<\/b> Blocked outlet or fire case<\/div>\r\n          <div><b>Discharge:<\/b> Plant flare header<\/div>\r\n          <div><b>Back pressure:<\/b> Variable during multi-valve relief<\/div>\r\n          <div><b>Valve review:<\/b> Bellows balanced or pilot operated PSV<\/div>\r\n          <div><b>Key review:<\/b> Flare header pressure, built-up back pressure, capacity correction and reaction force<\/div>\r\n        <\/div>\r\n        <p>\r\n          A flare-connected PSV should not be selected as if it discharges to atmosphere. Variable flare header pressure can change valve capacity and stability, especially during simultaneous relief cases.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-case zobai-hbp-span-6\">\r\n        <div class=\"zobai-hbp-case-top\">\r\n          <h3>Case 2: Acid Gas Reactor PSV to Caustic Scrubber<\/h3>\r\n          <span class=\"zobai-hbp-case-tag\">Scrubber Back Pressure<\/span>\r\n        <\/div>\r\n        <div class=\"zobai-hbp-case-data\">\r\n          <div><b>Protected equipment:<\/b> Chemical reactor<\/div>\r\n          <div><b>Medium:<\/b> Acid gas, solvent vapor and nitrogen<\/div>\r\n          <div><b>Set pressure:<\/b> 6 barg<\/div>\r\n          <div><b>Relief cause:<\/b> Blocked vent or reaction gas generation<\/div>\r\n          <div><b>Discharge:<\/b> Caustic scrubber<\/div>\r\n          <div><b>Back pressure source:<\/b> Packing pressure drop, demister fouling and liquid seal<\/div>\r\n          <div><b>Valve review:<\/b> Bellows balanced PSV with corrosion-resistant trim<\/div>\r\n          <div><b>Key review:<\/b> Corrosion, toxicity, scrubber capacity, two-phase risk and drainability<\/div>\r\n        <\/div>\r\n        <p>\r\n          Scrubber-connected PSVs require both hydraulic and chemical review. Corrosive vapor, liquid carryover and scrubber pressure drop can affect valve material, capacity and reliability.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-case zobai-hbp-span-6\">\r\n        <div class=\"zobai-hbp-case-top\">\r\n          <h3>Case 3: Pump Relief Valve Returning to Pressurized Tank<\/h3>\r\n          <span class=\"zobai-hbp-case-tag\">Liquid Return Line<\/span>\r\n        <\/div>\r\n        <div class=\"zobai-hbp-case-data\">\r\n          <div><b>Protected equipment:<\/b> Chemical transfer pump discharge<\/div>\r\n          <div><b>Medium:<\/b> Solvent, glycol, amine or chemical liquid<\/div>\r\n          <div><b>Set pressure:<\/b> Below piping design limit<\/div>\r\n          <div><b>Relief cause:<\/b> Pump deadhead or blocked discharge<\/div>\r\n          <div><b>Discharge:<\/b> Return line to storage tank<\/div>\r\n          <div><b>Back pressure source:<\/b> Tank pressure, static head and return line friction<\/div>\r\n          <div><b>Valve review:<\/b> Liquid relief valve with back pressure correction<\/div>\r\n          <div><b>Key review:<\/b> Pump curve, return capacity, liquid hammer and chemical compatibility<\/div>\r\n        <\/div>\r\n        <p>\r\n          Liquid relief to a return line can see significant outlet pressure. Tank pressure, elevation and pipe loss should be included before the valve is sized.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-case zobai-hbp-span-6\">\r\n        <div class=\"zobai-hbp-case-top\">\r\n          <h3>Case 4: Compressor Discharge PSV to Closed Vent Header<\/h3>\r\n          <span class=\"zobai-hbp-case-tag\">Gas Compressor Relief<\/span>\r\n        <\/div>\r\n        <div class=\"zobai-hbp-case-data\">\r\n          <div><b>Protected equipment:<\/b> Compressor discharge line or receiver<\/div>\r\n          <div><b>Medium:<\/b> Natural gas, hydrogen, nitrogen or process gas<\/div>\r\n          <div><b>Set pressure:<\/b> Equipment MAWP-based value<\/div>\r\n          <div><b>Relief cause:<\/b> Blocked discharge or control failure<\/div>\r\n          <div><b>Discharge:<\/b> Closed vent or flare header<\/div>\r\n          <div><b>Back pressure source:<\/b> Header load and downstream restriction<\/div>\r\n          <div><b>Valve review:<\/b> Bellows balanced or pilot operated gas PSV<\/div>\r\n          <div><b>Key review:<\/b> Compressor maximum flow, pulsation, vibration, leakage and safe gas routing<\/div>\r\n        <\/div>\r\n        <p>\r\n          Compressor relief is sensitive to pulsation and outlet header pressure. Valve stability, outlet support and gas dispersion should be reviewed before final selection.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-case zobai-hbp-span-6\">\r\n        <div class=\"zobai-hbp-case-top\">\r\n          <h3>Case 5: Reboiler PSV Discharging to Flare<\/h3>\r\n          <span class=\"zobai-hbp-case-tag\">Two-Phase Relief Risk<\/span>\r\n        <\/div>\r\n        <div class=\"zobai-hbp-case-data\">\r\n          <div><b>Protected equipment:<\/b> Kettle or thermosiphon reboiler<\/div>\r\n          <div><b>Medium:<\/b> Hydrocarbon vapor, solvent vapor or flashing liquid<\/div>\r\n          <div><b>Set pressure:<\/b> Reboiler MAWP-based value<\/div>\r\n          <div><b>Relief cause:<\/b> Blocked vapor outlet or excessive heat input<\/div>\r\n          <div><b>Discharge:<\/b> Flare header<\/div>\r\n          <div><b>Back pressure source:<\/b> Flare header and outlet piping pressure drop<\/div>\r\n          <div><b>Valve review:<\/b> Bellows balanced PSV or engineered pilot solution<\/div>\r\n          <div><b>Key review:<\/b> Two-phase relief, flashing, reaction force, flare back pressure and liquid carryover<\/div>\r\n        <\/div>\r\n        <p>\r\n          Reboiler relief can involve flashing liquid and two-phase flow. High back pressure can further reduce capacity, so the outlet system must be evaluated with the relief case.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-case zobai-hbp-span-6\">\r\n        <div class=\"zobai-hbp-case-top\">\r\n          <h3>Case 6: Thermal Relief Valve to Closed Drain Header<\/h3>\r\n          <span class=\"zobai-hbp-case-tag\">Closed Drain Back Pressure<\/span>\r\n        <\/div>\r\n        <div class=\"zobai-hbp-case-data\">\r\n          <div><b>Protected equipment:<\/b> Blocked-in liquid line or heat exchanger section<\/div>\r\n          <div><b>Medium:<\/b> Water, glycol, solvent, condensate or chemical liquid<\/div>\r\n          <div><b>Set pressure:<\/b> Below protected line or equipment limit<\/div>\r\n          <div><b>Relief cause:<\/b> Trapped liquid thermal expansion<\/div>\r\n          <div><b>Discharge:<\/b> Closed drain or recovery header<\/div>\r\n          <div><b>Back pressure source:<\/b> Header pressure and liquid static head<\/div>\r\n          <div><b>Valve review:<\/b> Thermal relief valve with compatible seat<\/div>\r\n          <div><b>Key review:<\/b> Liquid expansion, seat tightness, drain header pressure and return route availability<\/div>\r\n        <\/div>\r\n        <p>\r\n          Thermal relief valves are small, but outlet pressure still matters. If a closed drain header is pressurized or isolated, the valve may not relieve correctly.\r\n        <\/p>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"zobai-hbp-section\">\r\n    <div class=\"zobai-hbp-eyebrow\">Valve Type Matrix<\/div>\r\n    <h2 class=\"zobai-hbp-title\">Conventional, Bellows Balanced and Pilot Operated Safety Valves in Back Pressure Service<\/h2>\r\n\r\n    <div class=\"zobai-hbp-table-wrap\">\r\n      <table class=\"zobai-hbp-table\">\r\n        <thead>\r\n          <tr>\r\n            <th>Valve Type<\/th>\r\n            <th>Back Pressure Behavior<\/th>\r\n            <th>Typical Use<\/th>\r\n            <th>Engineering Checks<\/th>\r\n            <th>Main Advantage<\/th>\r\n            <th>Risk if Misapplied<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td>Conventional spring-loaded PSV<\/td>\r\n            <td>Sensitive to outlet pressure; back pressure can affect opening pressure, capacity and reseating.<\/td>\r\n            <td>Atmospheric discharge or low, stable back pressure.<\/td>\r\n            <td>Superimposed pressure, built-up pressure, allowable back pressure and blowdown.<\/td>\r\n            <td>Simple structure and broad service familiarity.<\/td>\r\n            <td>Capacity loss, set pressure shift, chatter or failure to reseat under high back pressure.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Balanced bellows PSV<\/td>\r\n            <td>Bellows helps reduce the effect of back pressure on opening characteristics.<\/td>\r\n            <td>Flare headers, scrubbers, closed vents and variable back pressure service.<\/td>\r\n            <td>Bellows material, bellows vent, corrosion, fatigue, outlet pressure and rupture indication.<\/td>\r\n            <td>Better stability than conventional valve in many back pressure cases.<\/td>\r\n            <td>Bellows corrosion, fatigue failure or unsafe venting if installation is wrong.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Pilot operated safety valve<\/td>\r\n            <td>Can handle higher back pressure in suitable clean service and offers tight operating margin.<\/td>\r\n            <td>Gas service, high-pressure systems, large capacity duties and tight shutoff applications.<\/td>\r\n            <td>Medium cleanliness, pilot sensing line, freezing, plugging, backflow, soft seat and maintenance plan.<\/td>\r\n            <td>High capacity, tight shutoff and good performance in selected high back pressure applications.<\/td>\r\n            <td>Pilot plugging, sensing line issues or unsuitability for dirty, viscous or polymerizing service.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Rupture disc plus PSV<\/td>\r\n            <td>Back pressure and interspace pressure must be considered carefully.<\/td>\r\n            <td>Corrosive, toxic, sticky or fouling service upstream of a safety valve.<\/td>\r\n            <td>Disc burst pressure, combination capacity factor, pressure monitoring and discharge header data.<\/td>\r\n            <td>Protects valve from corrosive or fouling process fluid.<\/td>\r\n            <td>Undetected disc leakage, capacity reduction or incorrect pressure monitoring.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Thermal relief valve<\/td>\r\n            <td>Outlet pressure can prevent relief if return or drain header pressure is too high.<\/td>\r\n            <td>Blocked-in liquid lines, heat exchangers, pump discharge sections and cryogenic liquid piping.<\/td>\r\n            <td>Static head, return pressure, liquid expansion, set pressure and seat leakage.<\/td>\r\n            <td>Compact protection for trapped liquid expansion.<\/td>\r\n            <td>Blocked return path, overpressure of trapped liquid section or continuous leakage.<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Modulating pilot valve<\/td>\r\n            <td>May limit relief flow to demand and reduce header load in suitable services.<\/td>\r\n            <td>Large gas systems, storage vessels, process gas and high operating pressure margin cases.<\/td>\r\n            <td>Process cleanliness, stability, turndown, pilot protection and header pressure variation.<\/td>\r\n            <td>Reduced product loss and smoother relief behavior in selected services.<\/td>\r\n            <td>Unstable operation if process, piping or pilot conditions are not suitable.<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"zobai-hbp-section zobai-hbp-section-soft\">\r\n    <div class=\"zobai-hbp-eyebrow\">Selection Framework<\/div>\r\n    <h2 class=\"zobai-hbp-title\">How to Specify a High Back Pressure Safety Valve Correctly<\/h2>\r\n\r\n    <div class=\"zobai-hbp-grid\">\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-6\">\r\n        <h3>1. Define the protected equipment and set pressure<\/h3>\r\n        <p>\r\n          Start with protected equipment MAWP, design pressure, set pressure, allowable overpressure and relief scenario. Back pressure review cannot replace the basic requirement that the valve protects the lowest-rated pressure boundary.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-6\">\r\n        <h3>2. Separate superimposed and built-up back pressure<\/h3>\r\n        <p>\r\n          Provide existing outlet header pressure before relief and calculated outlet pressure during relief. Separate constant, variable, superimposed and built-up components so the correct valve type and correction factors can be applied.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-6\">\r\n        <h3>3. Confirm the discharge system design basis<\/h3>\r\n        <p>\r\n          Review flare header, scrubber, silencer, vent stack, condenser, closed drain, return line, vapor recovery or BOG header data. Multi-valve relief and simultaneous depressuring cases may control total back pressure.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-6\">\r\n        <h3>4. Select valve construction from service conditions<\/h3>\r\n        <p>\r\n          Conventional valves may be acceptable for low and stable back pressure. Bellows balanced valves are commonly reviewed for variable outlet pressure. Pilot operated valves may be suitable for clean gas, high-pressure or tight shutoff service.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-6\">\r\n        <h3>5. Check capacity, stability and blowdown<\/h3>\r\n        <p>\r\n          Back pressure can reduce capacity and affect stable operation. Confirm corrected relieving capacity, inlet pressure loss, outlet pressure loss, reaction force, blowdown, reseating pressure and whether the valve may chatter.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-6\">\r\n        <h3>6. Confirm material, documents and testing<\/h3>\r\n        <p>\r\n          Bellows material, trim, gasket, soft seat and body material should match temperature, corrosion and medium. Required documents should include datasheet, back pressure basis, sizing calculation, MTC, calibration and test reports.\r\n        <\/p>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"zobai-hbp-section\">\r\n    <div class=\"zobai-hbp-eyebrow\">Installation & Discharge<\/div>\r\n    <h2 class=\"zobai-hbp-title\">High Back Pressure PSVs Must Be Reviewed With the Complete Outlet System<\/h2>\r\n\r\n    <div class=\"zobai-hbp-grid\">\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-7\">\r\n        <h3>Why outlet piping changes PSV performance<\/h3>\r\n        <p>\r\n          The relief valve and discharge system work as one system. Long outlet piping, small headers, flare load, scrubber pressure drop, liquid pockets, closed valves, silencers, vent stacks, return lines and shared headers can increase back pressure and reduce capacity.\r\n        <\/p>\r\n        <p>\r\n          High back pressure installations should review outlet line size, equivalent length, reaction force, pipe support, drainage, liquid seal, flare or scrubber hydraulic model, simultaneous relief cases, bellows vent location, maintenance access and whether the outlet header pressure can exceed the valve\u2019s approved back pressure range.\r\n        <\/p>\r\n        <div class=\"zobai-hbp-chip-row\">\r\n          <span class=\"zobai-hbp-chip\">Superimposed Back Pressure<\/span>\r\n          <span class=\"zobai-hbp-chip\">Built-Up Back Pressure<\/span>\r\n          <span class=\"zobai-hbp-chip\">Bellows Balanced PSV<\/span>\r\n          <span class=\"zobai-hbp-chip\">Pilot Operated PSV<\/span>\r\n          <span class=\"zobai-hbp-chip\">Flare Header<\/span>\r\n          <span class=\"zobai-hbp-chip\">Scrubber Discharge<\/span>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-5\">\r\n        <h3>Field installation checks<\/h3>\r\n        <ul class=\"zobai-hbp-list\">\r\n          <li>Confirm total back pressure at maximum relieving flow.<\/li>\r\n          <li>Check whether back pressure is constant or variable during plant upset.<\/li>\r\n          <li>Keep inlet pressure loss within the project design limit.<\/li>\r\n          <li>Support outlet piping without loading the valve body.<\/li>\r\n          <li>Prevent liquid pockets, frozen lines and blocked drains in discharge piping.<\/li>\r\n          <li>Vent balanced bellows safely according to project and manufacturer requirements.<\/li>\r\n          <li>Review flare, scrubber, closed vent or return line pressure before final valve selection.<\/li>\r\n        <\/ul>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"zobai-hbp-section zobai-hbp-section-soft\">\r\n    <div class=\"zobai-hbp-eyebrow\">Standards & Documentation<\/div>\r\n    <h2 class=\"zobai-hbp-title\">Standards and Documents to Confirm Before Ordering<\/h2>\r\n\r\n    <div class=\"zobai-hbp-grid\">\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-6\">\r\n        <h3>Common high back pressure references<\/h3>\r\n        <p>\r\n          High back pressure safety valve specifications may reference ASME, API, ISO, EN, GB, local pressure equipment regulations, owner flare design standards and project relief system documents. The applicable design basis should be confirmed before quotation.\r\n        <\/p>\r\n        <ul class=\"zobai-hbp-list\">\r\n          <li><a href=\"\/standards\/api-520\/\">API 520<\/a> for pressure-relieving device sizing and selection reference where required by the project.<\/li>\r\n          <li><a href=\"\/standards\/api-521\/\">API 521<\/a> for pressure-relieving and depressuring system review, including flare and closed relief systems.<\/li>\r\n          <li><a href=\"\/standards\/api-526\/\">API 526<\/a> when flanged steel pressure relief valve dimensions and ratings are specified.<\/li>\r\n          <li><a href=\"\/standards\/api-527\/\">API 527<\/a> when seat tightness testing is required by specification.<\/li>\r\n          <li><a href=\"\/standards\/asme-section-viii\/\">ASME BPVC Section VIII<\/a> where pressure vessels are part of the protected equipment scope.<\/li>\r\n          <li><a href=\"\/standards\/asme-b31-3\/\">ASME B31.3<\/a> where outlet piping, flare connections or process piping are specified under process piping rules.<\/li>\r\n          <li>Owner specifications for flare header back pressure, scrubber pressure drop, bellows venting and pilot valve application limits.<\/li>\r\n        <\/ul>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-6\">\r\n        <h3>Typical document package<\/h3>\r\n        <p>\r\n          Documentation should be agreed before manufacturing, especially for flare-connected valves, toxic service, corrosive scrubber discharge, pilot operated valves and bellows balanced PSV packages.\r\n        <\/p>\r\n        <ul class=\"zobai-hbp-list\">\r\n          <li>Technical datasheet with model, size, orifice, set pressure and connection.<\/li>\r\n          <li>Sizing calculation with superimposed, built-up and total back pressure values.<\/li>\r\n          <li>Back pressure correction basis and valve type selection note.<\/li>\r\n          <li>Set pressure calibration certificate.<\/li>\r\n          <li>Pressure test report and seat tightness test report when required.<\/li>\r\n          <li>Material certificates for body, bonnet, trim, bellows, spring and pressure-retaining parts.<\/li>\r\n          <li>General arrangement drawing with outlet orientation, weight and bellows vent details.<\/li>\r\n          <li>Nameplate, tag number, inspection witness record and project marking confirmation.<\/li>\r\n        <\/ul>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"zobai-hbp-section\">\r\n    <div class=\"zobai-hbp-eyebrow\">RFQ Checklist<\/div>\r\n    <h2 class=\"zobai-hbp-title\">High Back Pressure Safety Valve RFQ Data Checklist<\/h2>\r\n\r\n    <div class=\"zobai-hbp-table-wrap\">\r\n      <table class=\"zobai-hbp-table\">\r\n        <thead>\r\n          <tr>\r\n            <th>Required Data<\/th>\r\n            <th>Why It Matters<\/th>\r\n            <th>Example Input<\/th>\r\n          <\/tr>\r\n        <\/thead>\r\n        <tbody>\r\n          <tr>\r\n            <td>Protected equipment<\/td>\r\n            <td>Defines pressure boundary, MAWP and set pressure limit.<\/td>\r\n            <td>Pressure vessel, reactor, compressor, heat exchanger, pump line, storage vessel<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Set pressure<\/td>\r\n            <td>Defines valve opening pressure and back pressure ratio review.<\/td>\r\n            <td>6 barg, 16 barg, 45 barg, 150 psi, 10 MPa<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Required relieving capacity<\/td>\r\n            <td>Confirms whether the valve can protect equipment after capacity correction.<\/td>\r\n            <td>kg\/h, Nm\u00b3\/h, SCFM, t\/h, GPM, L\/min<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Relief scenario<\/td>\r\n            <td>Determines capacity, medium phase and discharge load.<\/td>\r\n            <td>Blocked outlet, fire case, pump deadhead, compressor failure, reaction relief<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Medium and phase<\/td>\r\n            <td>Affects sizing, valve type, back pressure correction and material.<\/td>\r\n            <td>Hydrocarbon vapor, natural gas, steam, solvent vapor, liquid, two-phase flow<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Superimposed back pressure<\/td>\r\n            <td>Identifies outlet pressure before the valve opens.<\/td>\r\n            <td>Constant 1 barg, variable flare header 0\u20134 barg, scrubber pressure 0.5 barg<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Built-up back pressure<\/td>\r\n            <td>Identifies outlet pressure generated by relief flow.<\/td>\r\n            <td>Outlet pipe loss, flare header loss, scrubber pressure drop, silencer loss<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Total back pressure<\/td>\r\n            <td>Controls valve selection and capacity correction.<\/td>\r\n            <td>Superimposed plus built-up back pressure at relieving condition<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Discharge destination<\/td>\r\n            <td>Determines whether outlet pressure is stable, variable or simultaneous-case dependent.<\/td>\r\n            <td>Flare header, scrubber, closed vent, vapor recovery, tank return, closed drain<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Relieving temperature<\/td>\r\n            <td>Affects body rating, spring, bellows, trim and seat selection.<\/td>\r\n            <td>-196\u00b0C, ambient, 120\u00b0C, 250\u00b0C, 450\u00b0C<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Material \/ special service<\/td>\r\n            <td>Prevents corrosion, bellows failure, leakage or plugging.<\/td>\r\n            <td>316SS bellows, Inconel bellows, sour gas, acid gas, oxygen clean, PTFE seat<\/td>\r\n          <\/tr>\r\n          <tr>\r\n            <td>Required documents<\/td>\r\n            <td>Avoids inspection, installation and commissioning delays.<\/td>\r\n            <td>Datasheet, drawing, MTC, sizing report, calibration report, pressure test, seat test<\/td>\r\n          <\/tr>\r\n        <\/tbody>\r\n      <\/table>\r\n    <\/div>\r\n\r\n    <p class=\"zobai-hbp-note\">\r\n      Final selection must be confirmed by protected equipment datasheet, relief case, back pressure calculation, applicable standard, valve manufacturer data and engineering review.\r\n    <\/p>\r\n  <\/section>\r\n\r\n  <section class=\"zobai-hbp-section zobai-hbp-section-soft\">\r\n    <div class=\"zobai-hbp-eyebrow\">Selection Errors<\/div>\r\n    <h2 class=\"zobai-hbp-title\">Common High Back Pressure PSV Selection Mistakes<\/h2>\r\n\r\n    <div class=\"zobai-hbp-grid\">\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-4\">\r\n        <h3>Assuming outlet pressure is zero<\/h3>\r\n        <p>\r\n          A PSV connected to flare, scrubber, closed vent or return line does not discharge to atmosphere. Outlet pressure must be included in sizing and valve type selection.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-4\">\r\n        <h3>Mixing up superimposed and built-up back pressure<\/h3>\r\n        <p>\r\n          Existing header pressure and pressure generated during relief are different. Mixing them can lead to wrong correction factors and unsuitable valve construction.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-4\">\r\n        <h3>Using conventional PSV in variable back pressure service<\/h3>\r\n        <p>\r\n          Conventional valves can be strongly affected by changing outlet pressure. Bellows balanced or pilot operated valves should be reviewed when back pressure is high or variable.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-4\">\r\n        <h3>Ignoring flare header simultaneous relief<\/h3>\r\n        <p>\r\n          A single PSV may look acceptable, but multiple valves relieving together can increase flare header pressure and reduce available capacity.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-4\">\r\n        <h3>Forgetting bellows material and venting<\/h3>\r\n        <p>\r\n          Bellows must match corrosion, temperature and fatigue conditions. Bellows venting must be handled safely and should not be blocked or connected incorrectly.\r\n        <\/p>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-card zobai-hbp-span-4\">\r\n        <h3>Ignoring liquid pockets in discharge piping<\/h3>\r\n        <p>\r\n          Liquid accumulation can increase back pressure, cause corrosion, freeze, block the outlet or create unstable relief. Discharge piping should be drained and reviewed.\r\n        <\/p>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"zobai-hbp-section\">\r\n    <div class=\"zobai-hbp-eyebrow\">Related Engineering Resources<\/div>\r\n    <h2 class=\"zobai-hbp-title\">Continue Your Back Pressure and PSV Selection Review<\/h2>\r\n    <p class=\"zobai-hbp-lead\">\r\n      These related pages help move from back pressure evaluation to detailed valve type selection, sizing, equipment-specific review and document preparation.\r\n    <\/p>\r\n\r\n    <div class=\"zobai-hbp-link-grid\">\r\n      <a class=\"zobai-hbp-link-card\" href=\"\/engineering\/safety-valve-selection-guide\/\">\r\n        <strong>Safety Valve Selection Guide<\/strong>\r\n        <span>Step-by-step guidance for selecting safety valves by medium, pressure, capacity, material and installation condition.<\/span>\r\n      <\/a>\r\n\r\n      <a class=\"zobai-hbp-link-card\" href=\"\/engineering\/safety-valve-sizing\/\">\r\n        <strong>Safety Valve Sizing<\/strong>\r\n        <span>Review required capacity, orifice selection, pressure data and sizing inputs before RFQ.<\/span>\r\n      <\/a>\r\n\r\n      <a class=\"zobai-hbp-link-card\" href=\"\/products\/bellows-safety-valves\/\">\r\n        <strong>Bellows Balanced Safety Valves<\/strong>\r\n        <span>For variable back pressure, corrosive service isolation and flare-connected applications.<\/span>\r\n      <\/a>\r\n\r\n      <a class=\"zobai-hbp-link-card\" href=\"\/products\/pilot-operated-safety-valves\/\">\r\n        <strong>Pilot Operated Safety Valves<\/strong>\r\n        <span>For clean gas, high capacity, high operating pressure and selected high back pressure service.<\/span>\r\n      <\/a>\r\n\r\n      <a class=\"zobai-hbp-link-card\" href=\"\/equipment\/reactors\/\">\r\n        <strong>Reactor Safety Valves<\/strong>\r\n        <span>For reactor relief to scrubbers, condensers, quench tanks, flares and closed collection systems.<\/span>\r\n      <\/a>\r\n\r\n      <a class=\"zobai-hbp-link-card\" href=\"\/equipment\/compressors\/\">\r\n        <strong>Compressor Safety Valves<\/strong>\r\n        <span>For compressor discharge PSVs, gas skids, flare headers, pulsation and vibration review.<\/span>\r\n      <\/a>\r\n\r\n      <a class=\"zobai-hbp-link-card\" href=\"\/equipment\/heat-exchangers\/\">\r\n        <strong>Heat Exchanger Safety Valves<\/strong>\r\n        <span>For tube rupture, reboilers, condensers, thermal relief and two-phase discharge.<\/span>\r\n      <\/a>\r\n\r\n      <a class=\"zobai-hbp-link-card\" href=\"\/applications\/corrosive-service\/\">\r\n        <strong>Corrosive Service<\/strong>\r\n        <span>For acid gas, scrubber discharge, sour gas, chlorides, solvents and special alloy requirements.<\/span>\r\n      <\/a>\r\n\r\n      <a class=\"zobai-hbp-link-card\" href=\"\/standards\/api-521\/\">\r\n        <strong>API 521 Relief System Review<\/strong>\r\n        <span>For flare, depressuring, closed relief systems and system-level pressure relief review.<\/span>\r\n      <\/a>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"zobai-hbp-section zobai-hbp-section-soft\">\r\n    <div class=\"zobai-hbp-eyebrow\">FAQ<\/div>\r\n    <h2 class=\"zobai-hbp-title\">High Back Pressure Safety Valve FAQ<\/h2>\r\n\r\n    <div class=\"zobai-hbp-accordion\" data-zobai-hbp-accordion>\r\n      <div class=\"zobai-hbp-acc-item is-open\">\r\n        <button class=\"zobai-hbp-acc-btn\" type=\"button\">What is back pressure on a safety valve? <span>+<\/span><\/button>\r\n        <div class=\"zobai-hbp-acc-body\">\r\n          Back pressure is the pressure at the outlet of a safety valve. It may already exist before the valve opens, or it may be generated by flow through outlet piping, flare headers, scrubbers, closed vents or return lines during relief.\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-acc-item\">\r\n        <button class=\"zobai-hbp-acc-btn\" type=\"button\">What is the difference between superimposed and built-up back pressure? <span>+<\/span><\/button>\r\n        <div class=\"zobai-hbp-acc-body\">\r\n          Superimposed back pressure exists at the valve outlet before the valve opens. Built-up back pressure is generated after the valve opens because relieving flow passes through the discharge system.\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-acc-item\">\r\n        <button class=\"zobai-hbp-acc-btn\" type=\"button\">When should a bellows balanced safety valve be used? <span>+<\/span><\/button>\r\n        <div class=\"zobai-hbp-acc-body\">\r\n          A bellows balanced safety valve should be reviewed when outlet back pressure is high, variable or connected to flare, scrubber or closed vent systems. The final choice depends on pressure, capacity, medium, temperature and back pressure calculation.\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-acc-item\">\r\n        <button class=\"zobai-hbp-acc-btn\" type=\"button\">Can a conventional PSV be used with back pressure? <span>+<\/span><\/button>\r\n        <div class=\"zobai-hbp-acc-body\">\r\n          A conventional PSV may be acceptable when back pressure is low, stable and within the valve\u2019s approved application limit. High or variable back pressure usually requires review of a bellows balanced or pilot operated valve.\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-acc-item\">\r\n        <button class=\"zobai-hbp-acc-btn\" type=\"button\">What data is required for a high back pressure PSV quotation? <span>+<\/span><\/button>\r\n        <div class=\"zobai-hbp-acc-body\">\r\n          Provide protected equipment, set pressure, relief scenario, required capacity, medium and phase, superimposed back pressure, built-up back pressure, total back pressure, discharge destination, relieving temperature, material requirement, connection and required documents.\r\n        <\/div>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n  <section class=\"zobai-hbp-section\">\r\n    <div class=\"zobai-hbp-rfq\">\r\n      <div>\r\n        <div class=\"zobai-hbp-eyebrow\">Engineering RFQ Support<\/div>\r\n        <h2>Prepare a Complete High Back Pressure PSV Datasheet Before Quotation<\/h2>\r\n        <p>\r\n          Send the protected equipment datasheet, set pressure, relief scenario, required capacity, medium and phase, relieving temperature, operating pressure, superimposed back pressure, built-up back pressure, total back pressure, discharge destination, material requirement, connection standard and required documents. A complete datasheet helps avoid unsafe assumptions and speeds up engineering review.\r\n        <\/p>\r\n        <div class=\"zobai-hbp-btn-row\">\r\n          <a class=\"zobai-hbp-btn zobai-hbp-btn-primary\" href=\"\/contact\/\">Request Engineering Quote<\/a>\r\n          <a class=\"zobai-hbp-btn zobai-hbp-btn-secondary\" href=\"\/ask-an-engineer\/\">Ask an Engineer<\/a>\r\n          <a class=\"zobai-hbp-btn zobai-hbp-btn-secondary\" href=\"\/catalog-pdf\/\">Download Catalog PDF<\/a>\r\n        <\/div>\r\n      <\/div>\r\n\r\n      <div class=\"zobai-hbp-rfq-box\">\r\n        <h3>Minimum RFQ data<\/h3>\r\n        <div class=\"zobai-hbp-rfq-grid\">\r\n          <div class=\"zobai-hbp-rfq-item\">Protected Equipment<\/div>\r\n          <div class=\"zobai-hbp-rfq-item\">Set Pressure<\/div>\r\n          <div class=\"zobai-hbp-rfq-item\">Relief Scenario<\/div>\r\n          <div class=\"zobai-hbp-rfq-item\">Required Capacity<\/div>\r\n          <div class=\"zobai-hbp-rfq-item\">Medium \/ Phase<\/div>\r\n          <div class=\"zobai-hbp-rfq-item\">Temperature<\/div>\r\n          <div class=\"zobai-hbp-rfq-item\">Superimposed BP<\/div>\r\n          <div class=\"zobai-hbp-rfq-item\">Built-Up BP<\/div>\r\n          <div class=\"zobai-hbp-rfq-item\">Total BP<\/div>\r\n          <div class=\"zobai-hbp-rfq-item\">Discharge Route<\/div>\r\n          <div class=\"zobai-hbp-rfq-item\">Material<\/div>\r\n          <div class=\"zobai-hbp-rfq-item\">Documents<\/div>\r\n        <\/div>\r\n      <\/div>\r\n    <\/div>\r\n  <\/section>\r\n\r\n<\/div>\r\n\r\n<script>\r\n  (function () {\r\n    var accordions = document.querySelectorAll('[data-zobai-hbp-accordion]');\r\n    accordions.forEach(function (accordion) {\r\n      var items = accordion.querySelectorAll('.zobai-hbp-acc-item');\r\n\r\n      items.forEach(function (item) {\r\n        var button = item.querySelector('.zobai-hbp-acc-btn');\r\n        button.addEventListener('click', function () {\r\n          var isOpen = item.classList.contains('is-open');\r\n\r\n          items.forEach(function (i) {\r\n            i.classList.remove('is-open');\r\n          });\r\n\r\n          if (!isOpen) {\r\n            item.classList.add('is-open');\r\n          }\r\n        });\r\n      });\r\n    });\r\n  })();\r\n<\/script>\r\n\r\n<script type=\"application\/ld+json\">\r\n{\r\n  \"@context\": \"https:\/\/schema.org\",\r\n  \"@type\": \"FAQPage\",\r\n  \"mainEntity\": [\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"What is back pressure on a safety valve?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Back pressure is the pressure at the outlet of a safety valve. It may already exist before the valve opens, or it may be generated by flow through outlet piping, flare headers, scrubbers, closed vents or return lines during relief.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"What is the difference between superimposed and built-up back pressure?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Superimposed back pressure exists at the valve outlet before the valve opens. Built-up back pressure is generated after the valve opens because relieving flow passes through the discharge system.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"When should a bellows balanced safety valve be used?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"A bellows balanced safety valve should be reviewed when outlet back pressure is high, variable or connected to flare, scrubber or closed vent systems. The final choice depends on pressure, capacity, medium, temperature and back pressure calculation.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"Can a conventional PSV be used with back pressure?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"A conventional PSV may be acceptable when back pressure is low, stable and within the valve\u2019s approved application limit. High or variable back pressure usually requires review of a bellows balanced or pilot operated valve.\"\r\n      }\r\n    },\r\n    {\r\n      \"@type\": \"Question\",\r\n      \"name\": \"What data is required for a high back pressure PSV quotation?\",\r\n      \"acceptedAnswer\": {\r\n        \"@type\": \"Answer\",\r\n        \"text\": \"Provide protected equipment, set pressure, relief scenario, required capacity, medium and phase, superimposed back pressure, built-up back pressure, total back pressure, discharge destination, relieving temperature, material requirement, connection and required documents.\"\r\n      }\r\n    }\r\n  ]\r\n}\r\n<\/script>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-56022b2d e-con-full e-flex cmsmasters-block-default e-con e-parent\" data-id=\"56022b2d\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-64a2e1fa e-con-full cmsmasters-effect cmsmasters-effect-type-transform e-flex cmsmasters-effect-hover-type-element cmsmasters-block-default e-con e-child\" data-id=\"64a2e1fa\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;,&quot;position&quot;:&quot;absolute&quot;,&quot;cms_transform_hover_type&quot;:&quot;element&quot;}\">\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-46a9ef9a e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"46a9ef9a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-329347e0 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"329347e0\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6a4a38f1 elementor-position-inline-start elementor-mobile-position-inline-start elementor-view-default cmsmasters-block-default cmsmasters-sticky-default elementor-invisible elementor-widget elementor-widget-icon-box\" data-id=\"6a4a38f1\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;cmsmasters-fade-in-left&quot;}\" data-widget_type=\"icon-box.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-box-wrapper\">\n\n\t\t\t\t\t\t<div class=\"elementor-icon-box-icon\">\n\t\t\t\t<span  class=\"elementor-icon\">\n\t\t\t\t<i aria-hidden=\"true\" class=\"cmsmsdemo-icon- cmsms-demo-icon-arrows-2\"><\/i>\t\t\t\t<\/span>\n\t\t\t<\/div>\n\t\t\t\n\t\t\t\t\t\t<div class=\"elementor-icon-box-content\">\n\n\t\t\t\t\t\t\t\t\t<h3 class=\"elementor-icon-box-title\">\n\t\t\t\t\t\t<span  >\n\t\t\t\t\t\t\tFEATURED SERIES\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-46c3000 elementor-widget__width-initial cmsmasters-block-default cmsmasters-sticky-default elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"46c3000\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;cmsmasters-fade-in-up&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Featured Safety Valve Series<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-17e84376 elementor-widget__width-initial cmsmasters-block-default cmsmasters-sticky-default elementor-invisible elementor-widget elementor-widget-heading\" data-id=\"17e84376\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;_animation&quot;:&quot;cmsmasters-fade-in-right&quot;,&quot;_animation_tablet&quot;:&quot;cmsmasters-fade-in-up&quot;}\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<div class=\"elementor-heading-title elementor-size-default\">Explore selected ZOBAI safety valve series for high-pressure service, back pressure conditions, steam systems, hygienic process lines, and continuous protection applications. These featured models help buyers and engineers compare product directions across different service conditions.<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-10551cfa elementor-pagination-type-bullets elementor-arrows-position-inside elementor-pagination-position-outside cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-n-carousel\" data-id=\"10551cfa\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;carousel_items&quot;:[{&quot;slide_title&quot;:&quot;Slide #1&quot;,&quot;_id&quot;:&quot;01fe9a5&quot;},{&quot;slide_title&quot;:&quot;Slide #1&quot;,&quot;_id&quot;:&quot;945d82b&quot;},{&quot;slide_title&quot;:&quot;Slide #1&quot;,&quot;_id&quot;:&quot;8ec93bd&quot;},{&quot;slide_title&quot;:&quot;Slide #1&quot;,&quot;_id&quot;:&quot;ee987c2&quot;}],&quot;slides_to_show&quot;:&quot;4&quot;,&quot;slides_to_show_tablet&quot;:&quot;2&quot;,&quot;slides_to_show_mobile&quot;:&quot;1&quot;,&quot;autoplay&quot;:&quot;yes&quot;,&quot;autoplay_speed&quot;:5000,&quot;pause_on_hover&quot;:&quot;yes&quot;,&quot;pause_on_interaction&quot;:&quot;yes&quot;,&quot;infinite&quot;:&quot;yes&quot;,&quot;speed&quot;:500,&quot;offset_sides&quot;:&quot;none&quot;,&quot;arrows&quot;:&quot;yes&quot;,&quot;pagination&quot;:&quot;bullets&quot;,&quot;image_spacing_custom&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:10,&quot;sizes&quot;:[]},&quot;image_spacing_custom_widescreen&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;image_spacing_custom_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;image_spacing_custom_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"nested-carousel.default\">\n\t\t\t\t\t\t\t<div class=\"e-n-carousel swiper\" role=\"region\" aria-roledescription=\"carousel\" aria-label=\"Carousel\" dir=\"ltr\">\n\t\t\t<div class=\"swiper-wrapper\" aria-live=\"off\">\n\t\t\t\t\t\t\t\t\t\t<div class=\"swiper-slide\" data-slide=\"1\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"1 di 4\">\n\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-70d366aa e-flex e-con-boxed cmsmasters-block-default e-con e-child\" data-id=\"70d366aa\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-c3b9eb1 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"c3b9eb1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-5e4359b9 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"5e4359b9\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-6469ad7e e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"6469ad7e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-43c250d4 cmsmasters-clip-path-yes cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-image\" data-id=\"43c250d4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"850\" height=\"850\" src=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/a46y-pilot-operated-relief-valve-high-pressure-service.webp\" class=\"attachment-large size-large wp-image-51693\" alt=\"A46Y pilot-operated relief valve with external pilot tubing and flanged body\" srcset=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/a46y-pilot-operated-relief-valve-high-pressure-service.webp 850w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/a46y-pilot-operated-relief-valve-high-pressure-service-300x300.webp 300w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/a46y-pilot-operated-relief-valve-high-pressure-service-150x150.webp 150w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/a46y-pilot-operated-relief-valve-high-pressure-service-768x768.webp 768w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/a46y-pilot-operated-relief-valve-high-pressure-service-260x260.webp 260w\" sizes=\"(max-width: 850px) 100vw, 850px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1bf920c1 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"1bf920c1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-51ab6117 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"51ab6117\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-68e80168 cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-heading\" data-id=\"68e80168\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">ZBA46 Series Pilot Operated Safety Valves<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7c0f27d3 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"7c0f27d3\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7828d76c cmsmasters-effect cmsmasters-effect-type-transform cmsmasters-effect-hover-type-element cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-button\" data-id=\"7828d76c\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;cms_transform_hover_type&quot;:&quot;element&quot;}\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/zobai.com\/de\/applications\/high-back-pressure\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t<i aria-hidden=\"true\" class=\"cmsmsdemo-icon- cmsms-demo-icon-arrows-1\"><\/i>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2b82faa3 cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-text-editor\" data-id=\"2b82faa3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Pilot operated safety valves for higher-pressure service requiring tighter sealing and stable set pressure performance.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"swiper-slide\" data-slide=\"2\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"2 di 4\">\n\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-4778f685 e-flex e-con-boxed cmsmasters-block-default e-con e-child\" data-id=\"4778f685\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-21b2b78d e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"21b2b78d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-2b5607d2 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"2b5607d2\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-62f73c79 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"62f73c79\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3b571416 cmsmasters-clip-path-yes cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-image\" data-id=\"3b571416\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"850\" height=\"850\" src=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/wa42y-bellows-balanced-full-lift-safety-valve-back-pressure.webp\" class=\"attachment-large size-large wp-image-51697\" alt=\"WA42Y bellows-balanced full-lift safety valve with flanged connections\" srcset=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/wa42y-bellows-balanced-full-lift-safety-valve-back-pressure.webp 850w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/wa42y-bellows-balanced-full-lift-safety-valve-back-pressure-300x300.webp 300w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/wa42y-bellows-balanced-full-lift-safety-valve-back-pressure-150x150.webp 150w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/wa42y-bellows-balanced-full-lift-safety-valve-back-pressure-768x768.webp 768w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/wa42y-bellows-balanced-full-lift-safety-valve-back-pressure-260x260.webp 260w\" sizes=\"(max-width: 850px) 100vw, 850px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2d431348 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"2d431348\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-43709838 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"43709838\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-164d5c90 cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-heading\" data-id=\"164d5c90\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">ZBWA42 Series Bellows Balanced Safety Valves<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-5a956c8e e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"5a956c8e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bed5682 cmsmasters-effect cmsmasters-effect-type-transform cmsmasters-effect-hover-type-element cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-button\" data-id=\"bed5682\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;cms_transform_hover_type&quot;:&quot;element&quot;}\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/zobai.com\/de\/applications\/high-back-pressure\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t<i aria-hidden=\"true\" class=\"cmsmsdemo-icon- cmsms-demo-icon-arrows-1\"><\/i>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-49890501 cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-text-editor\" data-id=\"49890501\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Bellows balanced safety valves for back pressure applications where stable performance is important.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"swiper-slide\" data-slide=\"3\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"3 di 4\">\n\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-46ad863c e-flex e-con-boxed cmsmasters-block-default e-con e-child\" data-id=\"46ad863c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-5d39c478 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"5d39c478\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-5c1b0d48 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"5c1b0d48\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-ed84944 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"ed84944\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-51854333 cmsmasters-clip-path-yes cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-image\" data-id=\"51854333\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"850\" height=\"850\" src=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/a46y-pilot-operated-relief-valve-high-pressure-service.webp\" class=\"attachment-large size-large wp-image-51693\" alt=\"A46Y pilot-operated relief valve with external pilot tubing and flanged body\" srcset=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/a46y-pilot-operated-relief-valve-high-pressure-service.webp 850w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/a46y-pilot-operated-relief-valve-high-pressure-service-300x300.webp 300w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/a46y-pilot-operated-relief-valve-high-pressure-service-150x150.webp 150w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/a46y-pilot-operated-relief-valve-high-pressure-service-768x768.webp 768w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/a46y-pilot-operated-relief-valve-high-pressure-service-260x260.webp 260w\" sizes=\"(max-width: 850px) 100vw, 850px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6e510e48 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"6e510e48\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-53e77e1b e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"53e77e1b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-93f6392 cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-heading\" data-id=\"93f6392\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">ZBA68 Series High Temperature Steam Safety Valves<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-296e3293 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"296e3293\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-52a804e4 cmsmasters-effect cmsmasters-effect-type-transform cmsmasters-effect-hover-type-element cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-button\" data-id=\"52a804e4\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;cms_transform_hover_type&quot;:&quot;element&quot;}\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/zobai.com\/de\/applications\/high-back-pressure\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t<i aria-hidden=\"true\" class=\"cmsmsdemo-icon- cmsms-demo-icon-arrows-1\"><\/i>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5779dc61 cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-text-editor\" data-id=\"5779dc61\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>High temperature steam safety valves for boilers, steam lines, and other elevated-temperature systems.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t\t<div class=\"swiper-slide\" data-slide=\"4\" role=\"group\" aria-roledescription=\"slide\" aria-label=\"4 di 4\">\n\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-3a858794 e-flex e-con-boxed cmsmasters-block-default e-con e-child\" data-id=\"3a858794\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-3f4d105d e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"3f4d105d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-366bc669 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"366bc669\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-42158200 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"42158200\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-28ca1bad cmsmasters-clip-path-yes cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-image\" data-id=\"28ca1bad\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"850\" height=\"850\" src=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/svl488-stainless-steel-safety-valve-cleaning-system.webp\" class=\"attachment-large size-large wp-image-51695\" alt=\"SVL488 stainless steel safety valve for cleaning systems with sanitary clamp connection and lifting lever\" srcset=\"https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/svl488-stainless-steel-safety-valve-cleaning-system.webp 850w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/svl488-stainless-steel-safety-valve-cleaning-system-300x300.webp 300w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/svl488-stainless-steel-safety-valve-cleaning-system-150x150.webp 150w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/svl488-stainless-steel-safety-valve-cleaning-system-768x768.webp 768w, https:\/\/zobai.com\/wp-content\/uploads\/2026\/04\/svl488-stainless-steel-safety-valve-cleaning-system-260x260.webp 260w\" sizes=\"(max-width: 850px) 100vw, 850px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-6a293a10 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"6a293a10\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-42f36edf e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"42f36edf\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7b8d2a16 cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-heading\" data-id=\"7b8d2a16\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">SVL488 Series Sanitary Safety Valves<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-15dcac95 e-con-full e-flex cmsmasters-block-default e-con e-child\" data-id=\"15dcac95\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7118184 cmsmasters-effect cmsmasters-effect-type-transform cmsmasters-effect-hover-type-element cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-button\" data-id=\"7118184\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;cms_transform_hover_type&quot;:&quot;element&quot;}\" data-widget_type=\"button.default\">\n\t\t\t\t\t\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/zobai.com\/de\/applications\/high-back-pressure\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-icon\">\n\t\t\t\t<i aria-hidden=\"true\" class=\"cmsmsdemo-icon- cmsms-demo-icon-arrows-1\"><\/i>\t\t\t<\/span>\n\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-24b54956 cmsmasters-block-default cmsmasters-sticky-default elementor-widget elementor-widget-text-editor\" data-id=\"24b54956\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Sanitary safety valves for hygienic process lines and cleaning systems requiring cleanable pressure protection.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<div class=\"elementor-swiper-button elementor-swiper-button-prev\" role=\"button\" tabindex=\"0\" aria-label=\"Indietro\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-eicon-chevron-left\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M646 125C629 125 613 133 604 142L308 442C296 454 292 471 292 487 292 504 296 521 308 533L604 854C617 867 629 875 646 875 663 875 679 871 692 858 704 846 713 829 713 812 713 796 708 779 692 767L438 487 692 225C700 217 708 204 708 187 708 171 704 154 692 142 675 129 663 125 646 125Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t\t<div class=\"elementor-swiper-button elementor-swiper-button-next\" role=\"button\" tabindex=\"0\" aria-label=\"Avanti\">\n\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-eicon-chevron-right\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M696 533C708 521 713 504 713 487 713 471 708 454 696 446L400 146C388 133 375 125 354 125 338 125 325 129 313 142 300 154 292 171 292 187 292 204 296 221 308 233L563 492 304 771C292 783 288 800 288 817 288 833 296 850 308 863 321 871 338 875 354 875 371 875 388 867 400 854L696 533Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t\t\t\t<div class=\"swiper-pagination\"><\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Home High Back Pressure Safety Valves for Flare, Scrubber, Closed Vent and Return Line Systems CONTACT SALES High Back Pressure Service High Back Pressure Safety Valves for Flare Headers, Scrubbers, Closed Vents and Return Lines High back pressure safety valves protect pressure vessels, reactors, compressors, heat exchangers, storage vessels, pipelines and skid systems when the&#8230;<\/p>","protected":false},"author":2,"featured_media":0,"parent":52780,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-53174","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/zobai.com\/de\/wp-json\/wp\/v2\/pages\/53174","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zobai.com\/de\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/zobai.com\/de\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/zobai.com\/de\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/zobai.com\/de\/wp-json\/wp\/v2\/comments?post=53174"}],"version-history":[{"count":4,"href":"https:\/\/zobai.com\/de\/wp-json\/wp\/v2\/pages\/53174\/revisions"}],"predecessor-version":[{"id":53178,"href":"https:\/\/zobai.com\/de\/wp-json\/wp\/v2\/pages\/53174\/revisions\/53178"}],"up":[{"embeddable":true,"href":"https:\/\/zobai.com\/de\/wp-json\/wp\/v2\/pages\/52780"}],"wp:attachment":[{"href":"https:\/\/zobai.com\/de\/wp-json\/wp\/v2\/media?parent=53174"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}