Chicago Pneumatic OEM 1312100170 1/2" x 1/2" NPT Check Valve for CP and BelAir Compressors
The Chicago Pneumatic 1312100170 compressor check valve utilizes 1/2" NPT threads on both the intake and outlet side. This should be changed out annually as a preventive maintenance item to help lengthen the life of the motor and prevent costly air leaks. You may see this valve listed in your manual as 1312-1001-70 or 1312 1001 70. This is commonly used on Quincy, Atlas Copco, and BelAir compressors and will fit any air compressor that uses 1/2” NPT fittings on both sides.
A compressor check valve is a one way valve designed to let the compressed air go from the compressor pump into the tank. Check valves allow the air to flow in one direction only, preventing backflow from the tank to the pump. A properly functioning check valve will prevent the compressor from having to start against backpressure, which can otherwise damage the motor and cause strain on the pump.
If air is leaking out of the pressure switch when the compressor is off, the check valve typically needs to be changed out. This results in debris or dirt causing the valve to stay open, letting air from the tank back through the small copper unloader line that connects to the pressure switch. If air leaks from the pressure switch when the compressor is shut off, you should replace the check valve rather than the pressure switch.
1312100170 check valve will fit the following piston/reciprocating compressors from Chicago Pneumatic and BelAir: