3z394 speedaire pressure relief valve needed

by rich
(littleton, co, usa)

I have an older speedaire 3z394 compressor that is missing the pressure relief valve.

I cant seem to find one and need to know if there is a standard replacement relief valve that I can obtain that is not too expensive.
Is there a manufacturer and a part number available?

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Sep 09, 2017
3z394 PRV
by: Doug in s.d.ca.

AFAICT, that's a 120 PSI machine. But you should try to verify that by checking the tank for a pressure rating - operating, not tested to pressure.

Then you can go looking for one 10-15 PSI over the rated 120PSI cutoff, but no more than the tank rating - here's a sample:

https://www.mcmaster.com/#pressure-reliefs

Then click "Pressure-Relief Valves", followed by
"ASME-Code Fast-Acting Pressure-Relief
Valves for Air and Inert Gas"

Yours is almost certainly 1/4 inch, which measures about 3/8 inch across the opening.

You might find one at your local big-box store.

Good luck.

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