Question about Campbell Hausfeld Single Stage Air Compressor. Single Stage Cast Iron Compressortwin Cylinder Vt Pump with Flywheel

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With compressor running the relief line blows off

The line coming from the check valve to the pressure switch does not leak air when compressor is off but when the compressor run the line blows off.

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Check that the non return valve is not stuck closed
hope this helps ian

Posted on Mar 25, 2009

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You must install an unloader valve right at the compressor discharge before the check valve.
Without it, the line is pressurized such that when it
starts, it blows off the line.

Posted on Nov 01, 2009

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I have a Dewault D55141 air compressor that runs to 150 lbs of pressure and blows the valve and releases air. I bought it new about 2 yrs ago? What needs to be done with this problem? I noticed on this...

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It sounds like you have blown out the pressure relief safety valve or somone loosened the valve portion that retains the spring and valve so that it was just hanging on by a thread. This could be very serious. It could mean the automatic pressure control is not shutting off the compressor creating a very dangerous over pressure condition. This is exactly the purpose of the pressure relief valve.

As you do not understand the operation of this unit, I would take it to any shop that repairs small motors and tell then what happened and have them repair it. At the worst, you will need a new preswsure releif valve and a new pressure control switch.

I have seen the damage done by a 2 gallon compressor that blew up and I want you to know it is very serious

good luck

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Small black tube found loose under top cover, blows air uncontrol

It should be a compression fitting on the bottom of the pressure switch. The tube is what supplies the air for the pressure switch. Disconnect the power before working on the unit.

If you remove the cover, you should be able to get access to it easier.

If you need more help, post a comment.



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