ZBDO/ZBDB Series Large Orifice Safety Relief Valves

Large Orifice Safety Relief Valves for large capacity pressure relief for refinery, ethylene, urea and power station turbine systems. Key selection data include 10V14 through 18AA24 / 20BB24 family, with orifice V, W, Y, Z, AA and BB references, Class 150 and Class 300 listed in catalog pages, confirm by size and orifice, -29 deg C to 232 deg C for listed standard tables; special materials/structures available by service, materials, connection standard and set pressure.

最终整定压力、认证泄放量、材质代号及连接标准须以经批准的参数表为准，并在采购前予以确认。.

技术参数与选型数据

产品型号

ZBDO/ZBDB Series

尺寸范围

10V14 through 18AA24 / 20BB24 family, with orifice V, W, Y, Z, AA and BB references

压力等级

Class 150 and Class 300 listed in catalog pages, confirm by size and orifice

温度范围

-29 deg C to 232 deg C for listed standard tables; special materials/structures available by service

适用介质

Refinery continuous reforming, ethylene, urea fertilizer and power station turbine service media

连接类型

Large flanged inlet/outlet safety relief valve

标准与合规

ISO 4126-1, API RP 520, API Std 526, API Std 527, ASME Boiler and Pressure Vessel Code Section VIII Division 1, and ASME B16.5 flange references where applicable.

工程解析：型号逻辑与应用边界

型号代码： ZBDO = conventional large-orifice safety relief valve; ZBDB = balanced bellows large-orifice safety relief valve; code identifies flange class, material, cap type and orifice/size.

典型应用： large capacity pressure relief for refinery, ethylene, urea and power station turbine systems

排量审查： Catalog pages list large orifice areas V, W, Y, Z and AA, maximum set pressure, back-pressure limit, dimensions and approximate weight.

本产品系列不应仅依据型号、公称尺寸或压力等级进行选型。请确认泄放工况、所需泄放量、整定压力、操作裕量、温度、背压及实际连接标准。.

尺寸与选型指南

Critical dimensions are configuration-specific. Use the verified specification fields below for preliminary review and request the controlled GA drawing for final piping or fabrication approval.

RFQ checklist

询价清单：型号或阀门类型、DN/NPS、PN/Class、整定压力、泄放介质、工作温度、阀体及内件材质、进出口连接标准、阀帽/杠杆/先导选项、数量、图纸、证书及检验要求。.

Failure Analysis, Manufacturing Evidence and Quality Control

Common misapplication risks: incorrect thread or connection standard, insufficient certified relieving capacity, unsuitable body or trim material, operating pressure too close to set pressure, unreviewed back pressure, and installation loads transferred to the valve.

Material review: body materials: Carbon steel, stainless steel, duplex stainless for urea service, balanced bellows refinery materials or alloy steel high-temperature power service materials. Trim and internals: Large-orifice trim selected by medium, temperature and required corrosion resistance. Spring and stem: Alloy or stainless spring according to temperature and material code.

Testing and inspection: Set pressure tolerance within +/-3 percent, overpressure and blowdown per ASME/API service, API 527 seat tightness, shell/seat test, material review and dimensional inspection according to the confirmed order.

Source and scope: product data is based on Zobai Safety Valve Product Catalog.pdf, catalog page 109-116. Project compliance remains subject to the approved datasheet, drawing, calculation and controlled certificates for the ordered configuration.

Review material traceability, type-test scope 和 project certificate requirements.

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适用于背压工况、且稳定性能至关重要的波纹管平衡式安全阀。.

ZBA68系列高温蒸汽安全阀

适用于锅炉、蒸汽管线及其他高温系统的高温蒸汽安全阀。.

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用于卫生工艺管路及清洗系统的卫生级安全阀，满足可清洁的压力保护要求。.

常见问题

Safety Valve FAQs

What models are covered by this ZBDO/ZBDB Series Large Orifice Safety Relief Valves page?