On Board Air Pressure Tank
Torxhead
Always Off-Roading Jeeper
The purpose of an unloader valve is to release the pressure at the compressor so it can restart easier, like in a job site or garage unit. I did install one in my original system, but I removed it an it seems to work just fine without it. A check valve to keep the air in the tank does help. I also have a fixed pressure switch that works just fine also.