speedaire 3Z421 PRV - I need to know the PRV psi

I need to know the PRV psi for my 3z421.
the current on is opening around 135 psi and the motor stops running at 140 psi.

Thanks

______________________
Bill says...

This is a compressor that may be 25-35 years old, I think.

Not that this matters, and, it may be a good thing, as it is possibly made in North America.

If your compressor normal cut out is 140 PSI, and this hasn't changed, then, regardless of the spec of the PRV, you need to change yours out (or clean it up to help it work properly) for one that pops off at about 20 PSI higher than the normal cut out of your compressor.

That should be safe.

Cheers,

Bill