Low Temperature Check Valve

Cryogenic check valve is an automatic valve specially used in extremely low temperature environments of -196℃~+80℃. It automatically opens and closes the valve disc through the flow of the medium to prevent the backflow of cryogenic fluids such as liquid oxygen, liquid nitrogen, and liquefied natural gas (LNG), and protect the safety of pipeline systems and equipment. Its core functions include:

Preventing medium backflow: ensuring one-way flow of cryogenic liquids to avoid reverse rotation of pumps or drive motors.
‌Stabilizing system pressure: maintaining pipeline pressure balance through sealing structures to reduce pressure fluctuations caused by the gasification of cryogenic media.
Core structure design
‌Valve body and drive assembly
‌Compact structure: adopting a short-stroke valve disc design (swing or lift type) to reduce the closing impact force and adapt to DN10~DN200 calibers.
‌Anti-freezing design: filling the valve seat area with refrigerant or setting a shock-absorbing cavity to reduce the risk of deformation of the sealing surface due to sudden temperature changes.
‌Sealing and wear-resistant technology‌

‌Double sealing‌: The valve disc is welded with hard alloy (such as chrome plating or nitriding) to improve the surface hardness, and the valve seat is embedded with flexible graphite or PTFE material to achieve low-temperature elastic sealing‌.
‌Buffering and loss reduction‌: Turbine blades or telescopic buffer sleeves are configured to consume the kinetic energy of the medium and reduce the scouring of the valve core by high-speed fluid‌.

Nominal diameter:DN10～200

Applicable temp.:Ⅶb:-196～150℃

Nominal pressure:PN40 bar

Applicable medium:liquid nitrogen,liquid oxygen, liquid natural gas and other low temperature medium

Valve disc sealing material:PTFE(code:P)

Valve body material:SS304(code:B) SS316(code:R), SS316L(code:L)

Connection way:socket welding

Installation way:normally horizontal installation, can also add spring on valve disc in order to strengthen sealing performance, at this moment, can be installed at any angle

The medium flow direction must be the same as arrow direction on valve body

 

Low Temperature Check Valve

 

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