Model C2949B-4Q Cartridge Check Valve

0-3000 PSIG Cartridge Check Valve


Circle Seal Controls Model C2949B-4Q Cartridge Check Valve

Catalog literature: Check Valves Catalog.pdf Acrobat DC

The Circle Seal Controls model C2949B-4Q Cartridge Check Valve provides a a leak-proof design with high reliability. They supply positive shutoff against line back pressure. In addition to being used in new equipment, they are interchangeable with and can be used to replace many cartridge valves. Typical installations include air tools, manifolds, pump housings, control panels, cylinder heads, and transmissions.

How it Works

Features and benefits:

  • Zero leakage: valve is absolutely bubble-tight in check direction; instant sealing with an o-ring; increased pressure makes the seal tighter
  • Quick opening: standard cracking pressure is 2 to 4 PSIG
  • Full flow: curved poppet face diverts flow smoothly; flow channel bypasses spring; minimum drop in pressure, especially evident in pneumatic applications
  • Body & seal material options: Brass or Steel bodies and Buna or Viton o-rings provides a wide combination of materials to make these valves suitable for many applications

Technical Data:

  • Operating pressure: 0 to 3,000 psig
  • Body material: Brass
  • Seal material: Buna
  • Temp range: -65 to +250F
  • Durometer: 90
  • Cracking pressure: 2-4 PSIG
  • Cv: 0.55


  • Diameter: 0.494″
  • Bore diameter: 0.501″
  • Length: 0.830″
  • Flow passage:  0.200″
  • O-ring size: -012
  • Backup ring size: -012


C2949B-4Q Cartridge Check Valve