There is a check valve between the tank and compressor head (output). The bleeder valve drains pressure between the check valve and the head, the check valve holds pressure in the tank from coming back out of the tank and toward the bleeder and head.
You may find this check valve screwed directly on to the tank or just outside the tank.
The discharge valve is leaking replace it. good luck finding parts.
SOURCE: coleman compressor no build up of pressure
your correct either the valves are worn or maybe just need cleaning as for the gaskets,idont know what part of the world your in but check out coleman on the internet or failing that ,i have maid these from gasket material suuplied from my local bearing supplier
SOURCE: Mastercraft 2.0 hp air compressor will not build up over 25 psi
sounds like a bad or broken valves in the head. crankcase needs a vent which is sometimes a small hole drilled into the oil fill plug and will normally blow some air out the vent while it runs
SOURCE: Dewalt 4 gal air compressor will not build pressure in take.
The bleed valve is an unloader of sorts that allows the compressor to start with-out a load. It closes when the pressure in the airline reaches about 20-25lbs with good volume. If air volume is not sufficient, the valve will not close. To solve the problem lets do a few tests. A long cord will reduce power and reduce air volume. Try powering the compressor with-out extension cord. If bleed valve closes when you do not use a cord, the compressor is not getting enough voltage, use shorter cord of the 12 gauge quality and more hose to reach work. If valve still does not close, check for air leaks on all fittings including around pressure switch and drain valve with soapy water. Repair as necessary and retest. If no leaks were found, temporarily plug bleed valve port with screw/bolt and run compressor till set pressure cut-off while counting minuites/seconds. The compressor should fill and shut off within three minutes or so. If it takes an unusually long time to fill, then the reed valves /valve plate is worn and leaking pressure back into cylinger. Leaking valves will usually result in very hot discharge airline/air. Reinstall the bleed valve after test. Parts and partslist are available at www.toolpartsdirect.com . Good luck on the repair and email if you have other questions.
SOURCE: Drain valve in Porter Cable air compressor
this valve works backwards, you screw it out to stop airflow. If that doesn't work, replace the valve.
David
SOURCE: I have a Bostitch CAP2000P-OF 6 gal compressor.
Something is wrong with your "unloader" I should think. That is the device that removes the pressure from the cylinder so the machine does not have to start up against its full air pressure
There will be a narrow air pipe connecting the compressor to the switch assembly which bleeds off the air when the power is off. That hiss you get when you turn it off or it turns itself off.
I think you will find a leak there or possibly the non return valve that stops all the air escaping when the unloader valve is open has failed or got a foreign body stuck in its seating.
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The compressor can't start up with air pressure backing up into the compressor head. Verify this and replace the check valve. If it still overloads the motor, the power supply conductors may be too skinny or too small Gage.
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