hitachi compressor runs until PRV blows

by Mark Krawec
(Petaluma, CA)

I have a Hitachi 2HP/4 Gallon twin tank compressor. It builds pressure. My problem is it keeps running until it blows the PRV valve. The pressure drops to a point where it starts up again and the cycle repeats. Changing the pressure set point doesn't seem to change the behavior. Should I replace the regulator or is it just a problem with the seal?

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Bill says...

This is a dangerous situation. You should correct it immediately.

Have a look at this page about pressure switches as I think this is your problem.

Cheers,

Bill