On your air compressor you will likely only see the part of the prv above from the wrench flats out to the ring on the end.
Air compressor pressure switch relief valve.
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It is also called a pressure relief valve as it reliefs pressure whenever the compressor pressure reaches a critical point.
Pressure relief valve photo.
However the compressor has its own internal pressure switch settings that control the tank pressure by setting the pressure point at which the motor should turn on and when it should turn off typically these cut in and cut out settings don t need to.
Other compressor pressure switches have integral unloader valves.
A pressure relief valve for an air compressor helps to keep you protected if the pressure of the compressor gets too high.
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The air compressor regulator controls how much air flows from your compressor to your air tools.
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The rest of the pressure relief valve will be threaded into a port that has access to the air tank.
Watch this fix before you start buying parts.