Model MB

Dual PlateKeystone

Dual plate, spring loaded, wafer style design for the protection of gas or liquid piping systems

• General service piping systems. Industry Standards • ASME B16.1, B16.5, B16.24, B16.34, B16.47 and B31.1 • API 594 and 598 • NACE MR-01-75

  • Light weight, versatile design, 80 to 90% lighter than conventional full-body check valves.
  • Reduces pipe supports, simplifies piping, easier, less costly installation.
    • Reduced thermal and seismic considerations.
    • No need for additional expensive support.
    • Optimum space utilization; simplified piping.
  • Spring-loaded, double door design has low cracking pressure.
  • Discs open 85° to ensure positive closing.
  • Materials and trims available for all services within temperature range.
  • Extended leg springs prevent seat wear caused by scrubbing.
  • Springs are precisely calculated to increase the responsiveness of the disc, thus reducing damaging effects of water hammer.
  • Resilient or metal-to-metal seat available.
  • BUNA-N, Viton®, EPDM (and other materials as required) molded into the body.

Technical Data




Up to Class 2500


-426°F - +1100°F


NPS 2-60



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