• Check Valves
     Our check valves are available in three bonnet designs. The first design is the Bolted Bonnet, With male-female joint, spiral wound gasket, made in F304L/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 trird design is the pressure seal bonnet, with a threaded and pressure seal bonnet joint.
     The check valve are also available in three different design configurations. These are piston check, ball check, or swing check designs.

• Design Construction and Specifications
     Our check valves conform to MSS-SP-118 and ASME B 16.34.
  Each are tested according to API598, and marking is per MSS SP-25.

• Construction is as follows:
  • Full Port or Convetional Port
  • Piston Check
  • Ball check
  • Swing check
  • Spring available on request
  • Bolted bonnet with spiral-wound gasket, threaded and seal welded bonnet or threaded and pressure seal bonnet
  • Socket weld ends to ASME B16.11
  • Screwed Ends(NPT) to ANSI/ASME B1.20.1

Piston Check Valve 800Lb
Piston Check Valve 900Lb～1500Lb
Swing Check Valve 800Lb,900Lb～1500LB