ZBNJ Series Safety Valve with Jacket
Safety Valve with Jacket for polyester, ethylene, urea and similar process units where the relief valve body and flanges need heat preservation. Key selection data include Catalog pages include ZBNJ dimensions and standard parameter tables, Class/PN rating by ZBNJ code and flange class selection, For heat-preserved process fluids; confirm by jacket, material and medium, materials, connection standard and set pressure.
Final set pressure, certified relieving capacity, material code and connection standard must be confirmed on the approved datasheet before purchase.
- Size range: Catalog pages include ZBNJ dimensions and standard parameter tables
- Pressure rating: Class/PN rating by ZBNJ code and flange class selection
- Temperature: For heat-preserved process fluids; confirm by jacket, material and medium
- Connection: Jacketed flanged connection with thermal insulation inlet/outlet and optional flushing inlets
- Media: Polyester, ethylene, urea and other media requiring heat preservation
- Drawings, test records and material documents confirmed for the ordered configuration.
Technical Specifications and Selection Data
Product Model
ZBNJ Series
Size Range
Catalog pages include ZBNJ dimensions and standard parameter tables
Pressure Rating
Class/PN rating by ZBNJ code and flange class selection
Temperature Range
For heat-preserved process fluids; confirm by jacket, material and medium
Applicable Media
Polyester, ethylene, urea and other media requiring heat preservation
Connection Type
Jacketed flanged connection with thermal insulation inlet/outlet and optional flushing inlets
Standards and Compliance
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.
Engineering Insight: Model Logic and Application Boundary
Model code: ZBNJ = safety valve with jacket. Model code identifies size, orifice, flange class, material, cap and special configuration.
Typical application: polyester, ethylene, urea and similar process units where the relief valve body and flanges need heat preservation
Capacity review: Balanced bellows protects set pressure from variable back pressure. Standard parameter pages should be used for final capacity and dimensions.
This product family should not be selected from model code, nominal size or pressure class alone. Confirm the relieving scenario, required capacity, set pressure, operating margin, temperature, back pressure and actual connection standard.
Dimensions and Selection Guide
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
RFQ checklist: model or valve type, DN/NPS, PN/Class, set pressure, relieving medium, operating temperature, body and trim material, inlet/outlet connection standard, cap/lever/pilot options, quantity, drawing, certificate and inspection requirements.
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: Body material per ZBNJ material code; special materials available for urea and severe corrosion service. Trim and internals: Austenitic stainless trim with Stellite facing as standard; optional urea-grade 316L, duplex stainless steel and super duplex F51/F53/F55. Spring and stem: Alloy or stainless spring protected by bellows and bonnet construction.
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 103-108. Project compliance remains subject to the approved datasheet, drawing, calculation and controlled certificates for the ordered configuration.
Review material traceability, type-test scope and project certificate requirements.
Related Products
FAQ
Safety Valve FAQs
What size, pressure and temperature data should be confirmed?
Size: Catalog pages include ZBNJ dimensions and standard parameter tables. Pressure: Class/PN rating by ZBNJ code and flange class selection. Temperature: For heat-preserved process fluids; confirm by jacket, material and medium. Confirm the exact combination for the selected model.
Which media can this product family handle?
Polyester, ethylene, urea and other media requiring heat preservation. Material and sealing compatibility require review for the actual fluid composition and temperature.
Can the catalog dimension table be used for final fabrication?
Use it for preliminary review only. Confirm critical dimensions, connection details and orientation on the approved order drawing before piping or equipment fabrication.
What should be included in the RFQ?
RFQ checklist: model or valve type, DN/NPS, PN/Class, set pressure, relieving medium, operating temperature, body and trim material, inlet/outlet connection standard, cap/lever/pilot options, quantity, drawing, certificate and inspection requirements.