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.
Final set pressure, certified relieving capacity, material code and connection standard must be confirmed on the approved datasheet before purchase.
- Size range: 10V14 through 18AA24 / 20BB24 family, with orifice V, W, Y, Z, AA and BB references
- Pressure rating: Class 150 and Class 300 listed in catalog pages, confirm by size and orifice
- Temperature: -29 deg C to 232 deg C for listed standard tables; special materials/structures available by service
- Connection: Large flanged inlet/outlet safety relief valve
- Media: Refinery continuous reforming, ethylene, urea fertilizer and power station turbine service media
- Drawings, test records and material documents confirmed for the ordered configuration.
Technical Specifications and Selection Data
Product Model
ZBDO/ZBDB Series
Size Range
10V14 through 18AA24 / 20BB24 family, with orifice V, W, Y, Z, AA and BB references
Pressure Rating
Class 150 and Class 300 listed in catalog pages, confirm by size and orifice
Temperature Range
-29 deg C to 232 deg C for listed standard tables; special materials/structures available by service
Applicable Media
Refinery continuous reforming, ethylene, urea fertilizer and power station turbine service media
Connection Type
Large flanged inlet/outlet safety relief valve
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: 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.
Typical application: large capacity pressure relief for refinery, ethylene, urea and power station turbine systems
Capacity review: Catalog pages list large orifice areas V, W, Y, Z and AA, maximum set pressure, back-pressure limit, dimensions and approximate weight.
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: 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 and project certificate requirements.
Related Products
FAQ
Safety Valve FAQs
What models are covered by this ZBDO/ZBDB Series Large Orifice Safety Relief Valves page?
ZBDO/ZBDB Series
What size, pressure and temperature data should be confirmed?
Size: 10V14 through 18AA24 / 20BB24 family, with orifice V, W, Y, Z, AA and BB references. Pressure: Class 150 and Class 300 listed in catalog pages, confirm by size and orifice. Temperature: -29 deg C to 232 deg C for listed standard tables; special materials/structures available by service. Confirm the exact combination for the selected model.
Which media can this product family handle?
Refinery continuous reforming, ethylene, urea fertilizer and power station turbine service media. 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.