Service Selection

Check Valves for Liquid Nitrogen (LN₂) Service

Which check valves configuration suits Liquid Nitrogen (LN₂) (N₂(l)), in which material, to which standard — from real service data, with the pitfalls flagged.

Which check valves for Liquid Nitrogen (LN₂)?

Check Valve (swing or piston, SS 316L) - Backflow prevention on LN₂ transfer pumps and vaporisers Typical service window: 0–25 barg (storage/transfer), up to 40 barg (high-pressure LN₂ systems), −196°C at normal boiling point; up to ambient during warmup.

Recommended Configurations

Check Valve (swing or piston, SS 316L)

Backflow prevention on LN₂ transfer pumps and vaporisers

Body Material for Liquid Nitrogen (LN₂)

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

SS 316LBest choice - austenitic stainless steel retains toughness at −196°C.Excellent Aluminium alloysExcellent cryogenic toughness - used in large LN₂ storage tank valves.Excellent A352 LCB/LCC (LTCS)Rated to −46°C; not suitable for −196°C without impact test certification.Good A350 LF2Forged LTCS to −46°C. Extended bonnet ball valves in A350 LF2 are common for LN₂.Good Bronze/BrassCopper alloys retain ductility at cryogenic temperatures - acceptable for small-bore service.Good Carbon SteelBrittle fracture risk below −29°C. Never use for cryogenic LN₂ service.Not Recommended

Governing Standards for Liquid Nitrogen (LN₂) Service

BS EN 13458ASME B16.34CGA V-6 (cryogenic fluid transfer)ISO 21011 (cryogenic valves)EIGA Doc 6

What to Avoid in Liquid Nitrogen (LN₂) Service

Carbon steel valves of any type
Standard-bonnet ball valves without extended stem - packing ices up

Service Considerations

All valves must have extended bonnets - stem packing must be at or above ambient temperature
Rapid cooldown thermal cycling - stainless steel preferred for CTE compatibility
Safety relief valves must be sized for maximum heat ingress boil-off rate
LOX condensation risk - LN₂ equipment must be kept free of oxygen-rich contamination