Model 2220B-1MM Check Valve

0-800 PSIG Check Valve


Circle Seal Controls Model 2220B-1MM Check Valve

Catalog literature: Check Valves Catalog.pdf Acrobat DC

The Circle Seal Controls model 2220B-1MM Check Valve is a reliable design that combines the functional advantages and operating economies of perfect sealing with small package size for low pressure systems where flow rates are small.

How it Works

Features & Benefits:

  • Quick opening / positive closing: opening pressures as low as 0.1 PSIG
  • Zero leakage: “bubble-tight” against back pressure
  • No “chatter” or “hammer”: the pulsating action of shock waves and hammer is absorbed by the resilient o-ring, which insures cushioned, quiet closing.
  • Compact, easy installation: as simple to install as a pipe nipple
  • Economical: single piece design provides maintenance-free, dependable operation

Technical Data:

  • Operating pressure: 0 to 800 psig
  • Proof pressure: 1200 psig
  • Body material: Brass
  • Seal material: Teflon
  • Connections: 1/8″ MNPT
  • Temp range: -100 to +400F
  • Cracking pressure: 5-7 PSIG
  • Cv: 0.26

Max Allowable Pressure Drop:

  • Air service: N/A
  • Oil service: N/A


  • “A” dimension (length): 1.30″
  • “B & C” dimensions (lengths): 0.39″
  • “D” dimension (hex): 0.50″

2220B-1MM Check Valve