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Series 7100 Flow Lift® Piston Check Valve

Norriseal-Wellmark proudly services this product.
Learn more or simply call 713-466-3552

Non-slam piston check valve designed for positive prevention of back-flow in gas, air or liquid systems. This award-winning design, has been installed in critical services around the world, including:

  • Air and gas compressor service
  • Gas or liquid pipe lines
  • Oil and gas production leases
  • Pulsating flows
  • Safety systems

Available in 1.0-inch through 12-inch sizes in ANSI 150 to 2500 pressure classes in threaded, raised face or ring joint end connections, with optional reduced port trims for low-flow applications.

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Series 7100 Flow Lift® Piston Check Valve


  • No-slam closing
  • No special tool required to change seat
  • Low pressure drop
  • High Cv values
  • Smooth opening
  • Special trims for abrasive and corrosive services
  • Built-in lifting device for piston removal and inspection
  • PTFE self-lubricating piston seal
  • Low maintenance costs
  • Bolted closure


  • ANSI Class 150 thru 10,000
  • API 5,000 and 10,000
  • Seal ring: PTFE spring energized
  • Seat: cage retained type
  • Optional trim meets MR0175 recommended practice

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