- Engineering guidance for selection, sizing, back pressure, installation and inspection.
- Standards references covering API, ASME, ISO and DIN/EN pressure-relief requirements.
- Catalogs, datasheets, certificate guidance and test-document support for procurement.
- Representative application cases and technical definitions for project review.
››› Resource Center
Find the resource you need for design, purchase or technical review
Start with the task you need to complete. Review the engineering basis, download product documents, confirm certificate requirements, study a comparable application or prepare the data needed for a safety valve quotation.
01
Knowledge Center
Read practical guides for safety valve selection, sizing, back pressure, installation, inspection and common application problems.
02
Catalogs & Downloads
Access safety valve catalogs, product datasheets, technical PDFs and downloadable reference material.
03
Certificates & Test Reports
Understand material certificates, type-test evidence, routine valve reports and the documents that may be required for project approval.
04
Application Cases
Review representative engineering workflows for pressure vessels, LNG skids and chemical reactors.
››› Documents & Certificates
Certificates and technical documents for project approval and handover
Safety valve documentation may include material certificates, type-test evidence, set-pressure calibration, shell pressure tests, seat-tightness reports, drawings, datasheets and inspection records.
For project use, compare every document with the supplied valve, purchase order and required standard. Confirm the document number, revision, applicable product range, test basis and traceability before approval.
››› Engineering Knowledge
Engineering guides for safety valve selection and relief-system review
Move from the protected equipment and governing relief case to a complete valve specification. These guides cover required capacity, selected orifice, certified performance, valve type, back pressure, installation and the documents needed for technical approval.
01
Safety Valve Selection
Define the relief scenario, operating conditions, valve design, materials, connections and documentation required for the service.
02
Sizing & Certified Capacity
Connect the required relieving load with calculated area, selected orifice and manufacturer-certified capacity.
03
Back Pressure & Bellows
Review superimposed and built-up back pressure, conventional valve limits and balanced bellows selection.
04
Installation & Commissioning
Review inlet pressure loss, outlet piping, supports, drainage, reaction force and commissioning checks.
››› Standards & Code References
Standards guides for sizing, selection, testing and connection review
Use these reference pages to understand how API, ASME, ISO and DIN/EN requirements connect with valve sizing, relief-system design, standardized orifices, seat-tightness testing, flange compatibility and pressure-temperature ratings.
01
API 520 Sizing
Pressure-relief device sizing, required area, selected orifice, certified capacity and selection data.
02
API 521 Relief Systems
Overpressure scenarios, flare and vent systems, depressuring, discharge loads and back-pressure conditions.
03
API 526 Flanged Valves
Standardized steel pressure-relief valve orifices, flange sizes, pressure classes and dimensions.
04
API 527 Seat Tightness
Seat-leakage test methods, test pressure, acceptance criteria and test-report requirements.
05
ASME Safety Valve Standards
ASME pressure-equipment, overpressure-protection and safety-valve requirements used in project specifications.
06
ISO 4126
International requirements for safety devices, terminology, performance and application review.
07
DIN / EN Standards
European safety-valve terminology, product requirements, testing and pressure-equipment context.
08
Pressure-Temperature Ratings
Check valve bodies, flanges, materials, gaskets and bolting at the actual design and relieving temperature.
››› Application Cases
Representative application cases for common industrial projects
Review how project inputs, governing relief scenarios, valve designs, materials, testing and document requirements are organized for typical industrial applications. The cases are anonymized engineering references and do not disclose customer-specific operating data.
CASE 01
Pressure Vessel OEM Case
A representative OEM workflow covering vessel data, relief cases, PSV sizing, materials, testing and final manufacturing records.
CASE 02
LNG Skid Case
A cryogenic package workflow covering battery limits, blocked-in LNG, BOG, flashing flow, materials and project documentation.
CASE 03
Chemical Reactor Case
A representative reactor workflow covering runaway reaction, two-phase relief, corrosion, discharge systems and test records.
››› Safety Valve Glossary
Safety valve terms explained for calculations, datasheets and RFQs
Use the glossary to distinguish closely related pressure-relief terms and understand how each one affects valve performance, sizing, operating stability and project data requirements.
TERM 01
Back Pressure
Pressure at the valve outlet. Learn the difference between superimposed, built-up and total back pressure and how outlet pressure can affect capacity and stability.
TERM 02
Blowdown
The difference between set pressure and reseating pressure. Review the formula, operating effects and information required in a valve datasheet.
››› Before Requesting a Quote
Send the engineering data required for a reliable valve review
A nominal connection size or existing model number is rarely enough for a new selection or replacement. Send the available process data, relief calculation, datasheet, nameplate, drawing and project specification so the valve and relief system can be reviewed together.
Minimum information for review
- Protected equipment and governing relief scenario
- Medium, composition and fluid phase
- Operating pressure, set pressure, MAWP and allowable overpressure
- Required relieving capacity or completed sizing calculation
- Operating, design and relieving temperature
- Superimposed and built-up back pressure
- Inlet and outlet size, connection standard and pressure class
- Body, trim, seat, spring, bellows, gasket and special materials
- Applicable code, inspection plan and required documents
- Datasheet, P&ID, drawing, nameplate or existing test records
››› FAQ
Common questions about ZOBAI resources
The resource center includes engineering guides, standards references, catalogs, certificate and test-document guidance, representative application cases, glossary entries and links for technical or quotation support.
Use the Catalogs, Datasheets and PDF Downloads page. Product-specific drawings or controlled documents may require confirmation of the valve model and project requirement.
Send the valve model, material, tag or order reference, applicable standard and required document list. Certificate and test-report availability depends on the product, order and inspection scope.
Yes. Send the existing nameplate, datasheet, protected equipment, process conditions, required capacity, back pressure and installation information. The replacement should be checked against the current service rather than selected only by model or connection size.
Provide the protected equipment, governing relief case, medium, pressures, temperatures, required capacity, back pressure, connections, materials, applicable standards, quantity and required documents.
ZOBAI can review the supplied engineering data and identify the information needed for sizing, valve-type selection, material review, connection checks and quotation. Final approval remains subject to the applicable code and project requirements.
Need help turning project data into a safety valve specification?
Send the available process conditions, relief calculation, datasheet, P&ID or existing valve information. ZOBAI can review the requirement and identify the next sizing, document or quotation step.