How to stop air air leak from the compressor..
by marci
My air compressor is set at 80 psi. It pumps to this setting and as soon as it shuts off you can hear a leak from a valve at the back. Bill answers... Hi Marci. Welcome to you and other folks from Victoria. It's hard to be sure without seeing it, but I suspect that "the valve at the back" is the unloader valve for your compressor. It's supposed to open when the compressor stops to "unload" the air that's compressed over the piston. So, when your compressor reaches the high pressure cut-out, the unloader valve opens, you hear that characteristic "psssshhhhtttt", and then the air stops. Only, in your case, it's not stopping. That tells me that the air (again, assuming that it's the unloader valve that the air is leaking from) is bleeding back out of your tank, up the air line to the unloader valve, and out to atmosphere. When your compressor is compressing air, it's pushing that air down into the tank through a one-way valve (also known as a check valve). That valve is supposed to keep the air in the tank when your unloader valve opens. I think that either your check valve has a worn seat, or there is debris that's preventing it from closing tightly, and that's where the air is coming from. If you are up to it, make sure the tank is empty and the compressor is unplugged, and look for where the air line from the compressor head goes into the tank. There should be a check valve assembly there. Dismantle it, make sure that the internal valve flapper or ball is seating cleanly, reassemble and test. If I'm right, this should solve your problem. Why not let us know how it turns out? Cheers, Bill
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