air bleeding out of the unloader valve part of the Furnas presure switch

by Bill Fleming
(Renfrew Ontario Canada)

I've read al the faq's and find them usefull but still not sure what the problem is exactly.

Compressor is a a 3 piston from Princess auto. Pressure swith is a Furnas 69HAU12S.
Runs on 220 v Ac.

Worked super well until lately.(4 years very light use)on at about 90 psi off at 120 psi.

Lately when compessor motor stops and the bleed off starts it will not quit.

If I push on the valve it continues, however if I shut off the power then depress the valve link the bleed off will quit.

I can hear no air.

The compressor will however loose presure gradually over night much more than it ever did before.

Maybe it's that check valve?

Thanks

Bill

bill.fleming@opg.com

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Bill says...

From what you are saying, I think it's your check valve too.

See the Valve page, and click the link to Check Valve for details.

Cheers,

Bill