PRV not working

by Bob Marnell
(Raleigh, NC)

My PRV is popping before getting up to full cut-off pressure. I visited my local repair shop, and the fellow said that I have one of the adjustable types (which can be screwed in using a slotted screwdriver to increase tension on the spring - it looks a lot like the PRV in your demonstration video). Is this possible / recommended?

Thanks,
Bob

Comments for PRV not working

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Oct 08, 2016
PRV not working
by: Doug in s.d.ca

Glad you got a new one.

Small single stage compressors usually only have one, at or on the tank.

Larger compressor with multi-stage pumps often have one or more PRV between the stages.

Oct 08, 2016
PRV
by: Bill

A multi-cylinder compressor pump will often have multiple PRV's. There is often one in the line between the pumps, and another protecting the tank from over pressure.

As to why the PRV let go, if your compressor is well used, then oil from the sump may be migrating up past the cylinder seal in greater than normal volume, and if this oil migrates to the PRV, it lubricates it, and reduces the cracking pressure.

Oct 08, 2016
PRV
by: Bob

...You offer no details on where this PRV is in the air circuit...

It's a standard pressure relief valve for a compressor. Aren't they always in the same spot (somewhere as a part of the pressure switch itself)?

In any case, I already purchased a new one in the interest of safety etc..

Thanks anyway

Oct 07, 2016
PRV not working
by: Doug in s.d.ca

You offer no details on where this PRV is in the air circuit.

I would not try to adjust it unless you have a source of air equal to what you need to adjust it to. If so, go for it.

Otherwise, I'd just buy a new, fixed PRV with the rating you need. They aren't that expensive.

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