Service Selection

Safety & Relief Valves for Ammonia (NH₃) Service

Which safety & relief valves configuration suits Ammonia (NH₃) (NH₃), in which material, to which standard — from real service data, with the pitfalls flagged.

Which safety & relief valves for Ammonia (NH₃)?

Pressure relief valve (spring-loaded) - Critical safety device on all pressurised ammonia vessels Typical service window: Up to 25 bar (refrigerant); up to 200 bar (synthesis gas), -33°C (liquid refrigerant) to 300°C (synthesis service).

Recommended Configurations

Pressure relief valve (spring-loaded)

Critical safety device on all pressurised ammonia vessels

Body Material for Ammonia (NH₃)

Rated from real compatibility data - click any material for the full decision page.

Carbon SteelStandard for ammonia - both refrigerant and process service.Excellent SS 304Acceptable but not normally required. Used where contamination is a concern.Good PTFEAcceptable for seats and seals.Good EPDMAcceptable for refrigerant ammonia seals.Good Bronze/BrassSCC and corrosion - strictly prohibited in ammonia service.Not Recommended Zinc alloys / Die-cast zincAttacked by ammonia - all zinc must be absent.Not Recommended NylonDegraded by ammonia.Not Recommended

Governing Standards for Ammonia (NH₃) Service

IIAR 2 - Ammonia refrigeration piping and equipmentASME B31.5 - Refrigeration pipingASME B31.3 - Process piping (process ammonia)ISO 15848 (fugitive emissions for toxic service)

What to Avoid in Ammonia (NH₃) Service

Any valve with copper, brass, or bronze wetted parts or body
Valves with zinc die-cast components
Nylon or polyamide-seated valves

Service Considerations

No copper or zinc - inspect every valve for copper alloy trim before installation
Extended bonnet design for cryogenic (-33°C) liquid service
Emergency isolation must be remotely operable
Refrigerant grade NH₃ is oil-free - valves must be clean and degreased

Other valve types for Ammonia (NH₃)

Globe Valves for Ammonia (NH₃)Ball Valves for Ammonia (NH₃)Gate Valves for Ammonia (NH₃)

Safety & Relief Valves for other services

Safety & Relief Valves for LNG / Cryogenic Natural Gas Safety & Relief Valves for High-Pressure Steam Safety & Relief Valves for LPG - Liquefied Petroleum Gas Safety & Relief Valves for Nitrogen (N₂)Safety & Relief Valves for Liquid Nitrogen (LN₂)Safety & Relief Valves for Argon (Ar)Safety & Relief Valves for Propylene / Propene (C₃H₆)Safety & Relief Valves for Urea Solution (Carbamide / DEF / AdBlue)

Reviewed by Process Engineering, Vajra Industrial SolutionsDiscipline: Process & Fluid Service EngineeringLast reviewed: 20 June 2026

Connected Engineering

Failure Modes

Packing Blowout

Products

Safety / Relief Valves

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Relevant Products

Vajra Safety & Relief Valves

Engineering references

Ammonia (NH₃) service guideFull compatibility, standards & considerations Vajra Safety & Relief ValvesFull range, specs & standards Spec Check engineValidate this spec before the RFQ