What material should a check valve for Nitrogen (N₂) be?

Carbon Steel (Excellent): Excellent for ambient and elevated temperature nitrogen service. SS 316L (Excellent): Excellent across all conditions including cryogenic liquid nitrogen. A352 LCB/LCC (Excellent): Required for low-temperature nitrogen below −29°C. PTFE (Excellent): Ideal for seals and lined valves in all nitrogen service. Bronze/Brass (Good): Acceptable for instrument and utility nitrogen at moderate pressures.

Nitrogen (N₂) service

Service Selection

Check Valves for Nitrogen (N₂) Service

Which check valves configuration suits Nitrogen (N₂) (N₂), in which material, to which standard — from real service data, with the pitfalls flagged.

Which check valves for Nitrogen (N₂)?

Check Valve (piston type) - Prevention of backflow at nitrogen injection points and compressor outlets Typical service window: 5–350 barg (atmospheric to high-pressure GAN), −196°C (LN₂) to +150°C (heated nitrogen).

Recommended Configurations

Check Valve (piston type)

Prevention of backflow at nitrogen injection points and compressor outlets

Body Material for Nitrogen (N₂)

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

Carbon SteelExcellent for ambient and elevated temperature nitrogen service.Excellent SS 316LExcellent across all conditions including cryogenic liquid nitrogen.Excellent A352 LCB/LCCRequired for low-temperature nitrogen below −29°C.Excellent PTFEIdeal for seals and lined valves in all nitrogen service.Excellent Bronze/BrassAcceptable for instrument and utility nitrogen at moderate pressures.Good

Governing Standards for Nitrogen (N₂) Service

ASME B16.34 API 6D ISO 9001:2015NFPA 50B (Gaseous Hydrogen)PED 2014/68/EU

What to Avoid in Nitrogen (N₂) Service

Diaphragm valves for high-pressure nitrogen above 40 barg
Butterfly valves for precise flow control in critical purging

Service Considerations

High-pressure nitrogen (>100 barg) requires trunnion ball valves with pressure-relief seats
Cryogenic liquid nitrogen requires extended-bonnet valves with A352 LCB/LCC bodies
Asphyxiation hazard - all nitrogen vent and drain valves must terminate safely
Nitrogen blanketing valves need tight shutoff (ANSI Class V or VI leakage)