>Golly, what's an unloader valve? DO cheap compressors have them?
Yes, it should.
An unloader valve is what Trevor described - it's a valve that unloads the
pressure on the compressor when it stops pumping. Basically, it's a check
valve with a bleed hole in it - the compressor stops pumping, the bleeder
releases the line pressure, and the check valve shuts off the tank
connection to keep it from losing all its air.
The one on my compressor (the head is an oilless 3-cylinder monster that
used to run a whole dentist's office of tools and a 100-gallon tank) used
to stick occasionally - a good whack with a wrench makes it unstick....8*)
ajr
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