Air Compressor Check Valves

An air compressor check valve is a one way valve designed to keep air inside of the receiver tank. When the compressor shuts off, a separate unloader is used to bleed off any head pressure inside of the compressor pump and in the discharge line going to the tank. The check valve then prevents backflow into the pump so the air compressor is not starting against a pressure load.

Often times you will know the check valve is bad as the air will leak consistently out of the unloader line when the compressor shuts off. This means high pressure air from the tank is leaking back past the check valve and into the pump. Operating with a faulty check valve will result in increased compressor cycling and risk of damaging your motor as it's trying to overcome 100+psi upon start.

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