PRV pops before the compressor stops

by Ken Rimington
(Perry, Utah)

I have an IR T-30 5HP vertical compressor. The pressure switch is a 174 PSI switch and the PRV is 175 psi. That seems pretty close to the cut-off pressure. I do not need 175 PSI pressure, so I was thinking as follows:

1. Replace the pressure switch with a 150 psi switch.
2. My compressor does not have an un-loader pilot valve, so I planned on getting a pressure switch with one.
3. I would replace the check valve assembly with a piloted check valve and plumb it with copper tubing to the pilot valve in the new pressure switch.

Is this plan OK and safe or are there precautions that I should take?

Comments for PRV pops before the compressor stops

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May 02, 2015
pressure switch / PRV
by: Doug in

Nothing obviously wrong, except I think the existing pressure switch is adjustable, and I think likely there is an unloader built into the compressor pump.

But that's all dependent on the exact model.

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