Circle Seal Controls®

Circle Seal Controls® is a manufacturer of reliable solutions in valves and controls for hydraulic, pneumatic, and cryogenic systems.

We offer the industry’s widest choice of quality precision valves and controls for industrial and aerospace/military applications. Our products include check valves, relief valves, shutoff valves, solenoid valves, cryogenic valves, sampling and bleed valves, electro-mechanical valves, float, vacuum, and pilot operated valves; pressure regulators; tyre fill valve gauges; gauge savers; temperature compensating pressure regulation systems.


  • Stop uncontrolled discharge of system media in the eventuality of a downstream line rupture.
  • Safety shut-off
  • Surge protection
  • Variety of end connections
  • Variety of seals
  • Automatic reset


  • A wide selection of check valves for liquid and gas service.
  • Connections from 1/8” to 2” in compression, female pipe, US and British threaded ends.
  • Various body materials ie. stainless steel, brass, carbon steel, aluminium
  • Pressure ratings to 20,000 psig
  • Zero leakage at low back pressure
  • Various seat materials


  • Inline and right angled adjustable pressure relief valves.
  • Connections from 1⁄8” to 1-1⁄2” (sizes vary for different models)
  • Stainless steel, brass, steel and aluminium
  • Operating range 0-10,500 psig
  • Zero leakage
  • 0.5 to 10,500 psig cracking pressure
  • Positive reseal

PDF Product Literature

Circle Seal Controls® Excess Flow

Circle Seal Controls® Check Valves

Circle Seal Controls® Relief Valves
Circle Seal Controls® Relief Valves

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