Adjusting the unloader valve on a recip comp. ![]() The pressure switch has reached set pressure – unloader valve needs adjustment?. ![]() Installation and Adjustment of the Unloader Valve.Now on with how unloader valves work, break and how to adjust them! Table of Contents If you’re interested in the broader principles of how an air compressor works – not just the unloader valve, you should check out our guide explaining how each type of air compressor works. This highlights the importance of an air compressor pressure switch unloader valve. ![]() If that air cannot escape, a significant additional load is created for the start-up of the compressor motor when the pressure switch turns the compressor back on and that pressure build-up may be enough to prevent the compressor from starting. On a reciprocating, rotary screw, and even fossil fuel air compressors, compressed air can be trapped over the piston when the compressor reaches the cutout pressure and stops.
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