DN40 stainless steel cryogenic check valve designed for LNG, LN2, LAr, and LO2 applications. This straight-through check valve ensures reliable backflow prevention in cryogenic systems with working pressures up to 40.0MPa.

Medium flows in the direction indicated by the arrow on the valve body. When flowing in the prescribed direction, the valve disc opens via medium force. During backflow, the valve disc seals tightly against the valve seat through disc weight and reverse medium pressure, effectively preventing medium reversal.

• ISO9001, CE, and other international certifications
• 12-month quality warranty period
• Stainless steel sealing surfaces for durability
• Structural length conforms to GB12221-1989
• Flange connection meets JB/T79-1994

• Ensure piping is thoroughly cleaned before installation
• Verify flow direction arrow matches fluid direction
• Maintain cleanliness as valves are pre-degreased
• Open all valves after pipeline construction to remove residue
• Perform degreasing for systems requiring oil-free operation
• Operate valves slowly during opening and closing
• Replace worn components (disc, seat, stem) promptly
• Always use new gaskets and sealing materials during maintenance