- Conduct cryogenic impact tests on valve materials to ensure that no brittle failure occurs at cryogenic.

- Used for cryogenic check valves below -101°C. Valve parts shall be cryogenically treated before finishing.

- Valve internals are selected to avoid blocking, occlusion, and bruising during frequent operation.

- Bolted bonnet; Swing and lift discs; Metal sealing surface.

- Connection between body and bonnet is generally by bolt + nut.

- Middle flange sealing gasket check valve generally adopts stainless steel + flexible graphite winding gasket; Metal ring pads may also be used.

- Seat cryogenic carbon steel check valve is generally forged seat, seat sealing surface spray welding user specified alloy.