This causes the unloader valve to open and vent the excess air from the compressor to the atmosphere.
Air compressor unloader control pilot valve.
Plug the compressor back in.
If your electrically powered air compressor is having a hard time starting try pulling the power cord and opening the drain valve to void all air from the tank.
Unloader valves are used to release pressure from air receivers where there is no mechanism to automatically stop the compressor for example on petrol or diesel air compressors.
This will effectively emulate the operation of the unloader valve as any air trapped over the piston will flow into the tank as the tank pressure drops.
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A failed air compressor unloader valve is one of the most common reasons why your air compressor cannot restart after you have used air from the compressor tank.
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As the compressed air downstream is used and the pressure drops to the load setting the pilot closes and depressurizes the unloader valve.
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When the the air compressor unloader valve is working correctly the pressure in the tank has dropped to below the normal cut in pressure level of the pressure switch the pressure.
There are few components on an air compressor that can multi task quite like the piloted unloader valve.
The piloted unloader valve.
The unloader idle piston is a device that once the unloader valve is activated brings the revs of the engine down to idle so both compressor and.
This single component can activate an engine idle control divert air from the tank when it reaches the top pressure setting and can reduce oil consumption by equalizing pressure between the pump and check valve.
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The pilot then opens and pressurizes the unloader valve.