Our forged steel check valves are available in three bonnet designs.
The first design is the Bolted Bonnet, with male-female joint, spiral wound gasket, made in SS304/graphite. Ring joint gasket are also available on request.
The second design is the welded bonnet with a threaded and seal welded joint. On request a full penetration strength welded joint is available.
The third design is the pressure seal bonnet, with a threaded and pressure seal bonnet joint.

Check valve Design construction and Specification.

Our check valve conform to API602, BS5352 and ASME B16.34. Each valve are tested according to API598, and marking is per MSS SP-25.

Connect end:
Socket weld conform to ANSI B16.11
Screw end  conform to NPT BSPT G ISO7-1 
Butt weld end conform to ANSI B16.25
Pressure available:800LB~2500LB
Material available:A105,LF2,F5,F11,F22,F304,f304L,F316,F316L,F321,F51,Monel400
Main Dimension as below.