EDCO Release Check Valves

Release check valves employ a normally closed valve to seal against pump vacuum without leaking. 

When a compressed air supply is applied, the release valve shifts to open at only 5 psi (0.3 bar) so that a full-flow burst of air can quickly dissipate (blow-off) system vacuum. Once shifted, the valve remains open. When the compressed air source is removed, the valve automatically resets to a closed position. 

Release check valves should be used for high-flow vacuum release applications such as those involving vacuum reservoirs or larger vacuum pumps.