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This step-by-step repair guide gives instructions for replacing the check valve on an air compressor. The check valve stops compressed air from flowing back into the pump from the tank. If the check valve is stuck open, high air pressure from the tank flows back into the pump head. The high pressure in the pump head won’t allow the piston to move, and the motor can’t start. Replace the check valve with the manufacturer-approved replacement part.
Use these steps to replace the check valve on common Craftsman, Dewalt and Devilbiss air compressors.
This video explains how to replace the check valve on an air compressor.
Unplug the air compressor’s power cord from the wall outlet.
Pull the ring on the safety valve to drain all air pressure from the tank. Wear work gloves to protect your hands.
PHOTO: Unplug the power cord.
PHOTO: Drain the air tank.
Unscrew the pressure switch tube fitting and disconnect the pressure switch tube from the check valve.
PHOTO: Disconnect the pressure switch tube.
Unscrew the outlet tube fitting and disconnect the outlet tube from the check valve.
PHOTO: Disconnect the outlet tube from the check valve.
Unscrew the check valve and remove it from the tank.
PHOTO: Unscrew the check valve.
Thread the new check valve into the tank.
Tighten the check valve and align the fitting to connect the pressure switch tube.
PHOTO: Install the new check valve.
Reinstall the outlet tube on the check valve.
PHOTO: Reinstall the outlet tube.
Reinstall the pressure switch tube on the check valve.
PHOTO: Reinstall the pressure switch tube.
Plug the compressor back in.
PHOTO: Plug the compressor in.
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