Check Valves for LNG & Cryogenic Service
Extended-bonnet ball, gate, and globe valves for LNG, liquid nitrogen, liquid oxygen, and other cryogenic service - low-temperature impact tested materials.
Which check valves are used for lng & cryogenic service?
Cryogenic service (below −46°C to −196°C) requires valves specifically designed and tested for extreme low temperatures. LNG (−162°C), liquid nitrogen (−196°C), liquid oxygen (−183°C), and liquid CO₂ applications demand low-temperature impact-tested materials, extended bonnets to prevent packing freeze, and cryogenic testing per BS 6364 or ASME B16.34 Annex F.
Cryogenic Check Valve
Non-return service on LNG pump discharge and send-out systems
Critical Requirements
- Charpy V-notch impact testing at design temperature (−46°C to −196°C) per ASTM A370
- Extended bonnet design to maintain stem packing above −20°C minimum
- Cryogenic testing per BS 6364: gas bubble leak test at operating temperature
- Materials: ASTM A350 LF2 (forged) or A351 CF8M/CF3M (cast) - not A216 WCB
- Fire-safe design (API 607) for LNG and flammable cryogenic fluids
- Full-bore design where pigging or slug control is required
Service Challenges
- LNG at −162°C - most carbon steels become brittle (DBTT); must use low-temperature impact-tested alloys
- Liquid oxygen - fire and explosion risk if hydrocarbons present; oxygen-clean service essential
- Liquid nitrogen - extreme cold; thermal cycling causes fatigue in seals and fasteners
- Icing / frosting - moisture in atmosphere can ice on cold valve surfaces; extended bonnet keeps packing warm
- Boil-off gas - pressure relief and safety valve sizing must account for flash vaporisation
Vajra Check Valves
Non-return valves to prevent backflow and protect equipment in piping systems.
See the full Check Valves rangeOther valves for lng & cryogenic service
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