The air compressor unloader valve is usually built into the pressure switch assembly, though it's sometimes found on top of the switch. Contact the air compressor manufacturer to buy a new assembly.

On the output side of the tank resides a pressure switch for automatically filling ... first time we’ve seen a refrigerator compressor used as an air compressor. Check out this dual setup ...

Onboard air can save you time ... Steel braded-leader hose (PN VAR- 92793), and a Viair 110/145 psi pressure switch (PN VAR-90102). We also used a locally sourced water/oil separator just before ...

With the compressor still running, the refrigerant will be pumped out of the evaporator. When the low-side pressure gets to a value that ensures the refrigerant is sufficiently pumped out of the ...