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Vacuum Check Valves
Brand: EDCO USAVacuum check valves are designed to prevent reverse flow of ambient air into a vacuum system by holding vacuum downstream whenever the vacuum source is removed or lost.
Internally, a normally closed valve allows vacuum flow in the pump direction but seals off when vacuum flow ceases.
When a vacuum check valve is used in a system, some provision must be made to release the trapped vacuum to release the workpiece.