On Sat, 29 Jun 2013 22:31:46 -0500, Tim Wescott
wrote:

On Sat, 29 Jun 2013 19:28:52 -0700, PrecisionmachinisT wrote:

"axolotl" wrote in message
...

The patient is a Sears compressor- really a relabeled Campbell
Hausfield VT200001; two cylinder, 2 HP, 20 Gal tank. The unit pumps up
and shuts down as it should. Air is leaking, from the sound of it, at
the reed valves. The tank pressure drops. My guess of the moment is
that the check valve on the tank is leaking.

Instead of emitting a single, short burst of air upon shutdown, air will
continue to be expelled from the unloader vavle at the pressure switch
if the check valve is failed.

Is my logic flawed?


Nope.

Thanks,

You're perfectly welcome.

A lot of times you can pull the check valve out and clean it and or
otherwise kludge some sort of temporary fix to get you by till a new one
arrives.

I don't know about Kevin's cheap air compressor, but my cheap air
compressor does not have an unloader valve -- it just has a leak on the
compressor side, and a check valve.

I figured this out because when I got it the thing wouldn't start against
pressure. After puzzling over it and a bit of checking, I found out that
someone had taken the ball (but not the spring) out of the check valve.
Fortunately, we have some little ball bearing and magnet toys; the kids
did not notice one ball bearing fewer, and now my compressor works fine.

Speaking of balls, my Gardner Denver uses a ball as an outlet valve.
When I first got it the ball was somewhat corroded but a visit to my
friendly auto mechanic produced a suitable replacement.
---

Gerry :-)}
London,Canada