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Puma tue7580 two stage, the relief valve on the inter cooler pops just bebore max pressure is reached, i have changed the relief valve and the valve plate, no change. what's next

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: My EC12 builds up pressure, but then releases all but about 10 psi.

The non-return valve is sticking and it's an easy fix. First, for safety, unplug the electric power to the unit and release any pressure in the tanks. Then unscrew the cap of the non-return valve (between the compressor and the tanks). Inside you should find a tapered rubber plug which is probably sticking in the valve housing. Sand down the diameter of the large end of the plug, being careful not to damage the flat face at the narrow end (which is the sealing surface). For sanding try 400 or 600 grade wet-or-dry paper and sand until the plug just moves freely in the housing. Reassemble and the compressor should work. Incidentally it's an oil-type unit, and quite durable. Make sure it has enough oil.

Posted on Nov 14, 2008

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SOURCE: My EC12 builds up pressure, but then releases all but about 10 psi.

Bruno2

This was a great find, been having this problem for a while, but your suggestion worked. Thanks so much.

twodogs2

Posted on Nov 22, 2008

SOURCE: The compressor relief valve keeps popping, compressor runs

What pressure is it popping off at? You might have to adjust the pressure switch to a lower setting.

Posted on Apr 01, 2009

comax
  • 154 Answers

SOURCE: keeps stalling out

It sounds like you will have to adjust the governor system to hold the throttle on the motor open more so it doesn't bog the motor down. There should be an adjustment screw at the carb to perform this.
Hope this helps

Posted on Apr 14, 2009

  • 54 Answers

SOURCE: I have a quincy 350 and the relief valve on the

It won't be rings. You may have solved the main issue with the valve replacement, but still have a weak safety valve, especially if it was popping a lot before your repair.. I'd try replacing the safety valve before going much further.

Posted on Nov 06, 2009

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2 Answers

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The over-pressure relief valve may be defective if the valve is opening before the desired tank pressure is reached. If not, then the shut-off pressure adjustment (if there is one) may be set wrong. You'll need to find out from the manufacturer exactly what static tank pressure the compressor is designed to provide and then determine if it is working correctly. If so, then the relief valve might be defective. DO NOT attempt to defeat the relief valve under any circumstances - it can result in compressor damage or a dangerous tank failure.

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You didn't give the model of your compressor so, for an electric model: Check your gages while the tanks are filling. If the pressure gets to the rated high pressure level for your model and keeps going until the relief valve pops, the problem is with the pressure switch. It isn't turning the motor off when it's supposed to. If the relief valve pops before getting to the max pressure the tanks are supposed to be at then the spring in the valve is broken or weakened to where it pops too early. Replace the relief valve.

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How do I adjust the cut-out pressure on my DeWalt D55140 compressor? The relief valve is activating at 140psi before the compressor cuts off.


I had the same problem. The relief valve loosened up after a couple years of use. Right around the center pin in the relief valve is a ring that has a slot in it that you can fit a small straight blade screwdriver into and tighten in a clockwise direction. This should tighten the spring on the relief valve and raise the pop-off pressure above the 150 psi setting of the cutout switch.

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I have a quincy 350 and the relief valve on the second stage keeps lifting. I have changed valves, unloader, gaskets, filters and cleaned the cooler. Could it be the rings?


It won't be rings. You may have solved the main issue with the valve replacement, but still have a weak safety valve, especially if it was popping a lot before your repair.. I'd try replacing the safety valve before going much further.

Nov 05, 2009 | Air Tools & Compressors

1 Answer

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We have a Westinghouse 3YC air compressor. The safety relief valve in the line between the two compressors started "popping off" recently. The compressor seems to be working fine. Is this a problem only with the relief valve or could there be a symptom of a more serious condition that we should be attending to? The valve is stamped 60 max which I assume is 60 psi. Is this the correct size. The tank pressure is set for125 psi. The tank relief valve is marked 250 max.

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Yes,but if the max is 125 you don't want to increase it above 110 and set off the pressure relief valve.

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1 Answer

Keeps stalling out


It sounds like you will have to adjust the governor system to hold the throttle on the motor open more so it doesn't bog the motor down. There should be an adjustment screw at the carb to perform this.
Hope this helps

Apr 06, 2009 | Air Tools & Compressors

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