There are few components on an air compressor that can multi task quite like the piloted unloader valve.
Air compressor unloader check valve.
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It blows off the pressure inside the discharge pipe when the compressor stops there is another type of unloader valve which can be found at the inlet of rotary screw compressors also called inlet valve or loading valve.
This big valve is further controlled by a small pilot valve.
The piloted unloader valve.
Air compressors that are powered by a gasoline diesel or even propane motor have unloader valves as well.
When the air compressor is turned off by the pressure switch the unloader valve is also triggered.
131big rolair air compressor pilot unloader valve oem 4 5 out of 5 stars 5 5 product ratings 131big rolair air compressor pilot unloader valve oem 43 40.
Gasoline or diesel driven compressor unloader valves.
Compressor unloader valves are common pieces of equipment on many types of air compressors including reciprocating rotary screw and even gasoline or other fossil fueled air compressors.
Bigger compressors also have a big unloader valve which is placed beside the air compressor.
Gas air compressor unloader check valve pilot combo w throttle control 8hp max.
This fix my compressor website is focused on the do it yourself and small workshop air compressor and most of these are reciprocating type air compressors.
Air compressor pilot check valve unloader combination discharge 1 2 female npt inlet x 1 2 male npt outlet all in one valve for gas powered compressors 95 125 psi 4 7 out of 5 stars 30 39 90 39.
On these types of air compressors the unloader valve is also now known as a throttle valve.
As mentioned a check valve is also installed to prevent the whole tank from draining.