Robust Non-Slam Valves

Protect equipment from reverse flow with robust non-slam valves designed for pulsating flow.

Non-return valves (also called check valves) maintain line pressure in the event of unexpected decompression, preventing contamination of the process, protecting equipment against damage, and improving safety.

Cook Compression custom designs each non-return valve based on pipe size, flow rate, pulsations, pressure, temperature and gas composition, to ensure the lowest pressure losses and highest reliability.

Reliable Valve Closing

At the heart of the Cook Compression non-return valve is a discharge plate valve from the proven Optima™ valve series.

To ensure the valve closes quickly during gas reversal, Cook Compression optimizes the plate mass and the springing based on the application flow rate. A steel plate provides a good initial seal, while a frictionless guide minimizes wear for extended component life.

Since each non-return valve is designed to the specified mass flow rate and pulsations, Cook non-return valves do not experience flutter, thus maintaining their sealing effectiveness. For non-return valves that must accommodate a range of flows, our valve designers work with the customer to achieve maximum performance.

Typical Configurations

Cook Compression non-return valves feature single-piece upper and lower housings in a range of designs. For corrosive applications, housing materials are available to meet NACE specifications.

  • Flanged housings – for flange to flange connection that is less prone to failure
    • Bell-shaped
    • Straight
    • Neck-down
  • Wafer housings – compact, between flange connection to help minimize equipment footprint
  • Specialty housings – custom designs that use Grayloc® connectors

(Grayloc® is a registered trademark of Grayloc Products, L.L.C.)


  • Quick, effective seal without slamming or flutter
  • Large flow area for improved efficiency
  • Design options to fit your application
  • Optimized for pipe size, flow rate, pulsations, pressure, temperature and gas composition
  • Hydro, PMI, leak, fugitive emission, and PED testing