Piston Check Valve

The Calvary P-Check Piston Check valve is an excellent selection for services where low or pulsating flows are expected. The piston check is of globe type design. It is inherently rugged and has no hinge pins, bushings, or bolted connections which would be subject to impact loads when the valve seats. The valves are manufactured and tested to ANSI B16.34 API 6D and API 6A specifications. For optimum performance, piston check valves should be installed with the bonnet of the valve upright and vertical.

When installed in this position, the weight of the disc helps to center the disc and reduce wear due to disc drag on the body and seat. Piston check valves can provide tight shutoff if the differential pressure across the disc is relatively large. To provide tight shutoff at a differential pressure of less than 100 psi an elastomeric sealed seat is normally provided.

Sizes: 2″ Thru 20″
Pressure Classes: 150, 300, 600, 900, 1500, 2500
Operating Temperatures: -50F to +500F (-46C to +260C)
Available End Connections:

  • Raised Face Flange
  • Ring Joint Flange
  • Weld End Connection
  • Flanged By Weld End Connection


  • Cast and Forged Steel Construction
  • Positive (Zero-Leak) Closure
  • Mechanical Sealing/Operation
  • High Reliability/Repeatability
  • Fire safe Design
  • NACE


Click here to download PDF for technical information.