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Picked up small air compressor at auction

5

550Doug

Member
Location
Southern Ontario
and of course there is no manual. It runs fine and will do the auto shutoff at around 120psi. However, there is a small brass plug installed just opposite the gauge and this plug continually leaks air. It has a drilled hole, so it's designed to do that, but shouldn't it stop leaking at say 80psi?


<a href="http://s146.photobucket.com/albums/r268/dgminke/?action=view&current=aircomp03.jpg" target="_blank">
aircomp03.jpg" border="0" alt="Photobucket
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<a href="http://s146.photobucket.com/albums/r268/dgminke/?action=view&current=aircomp02.jpg" target="_blank">
aircomp02.jpg" border="0" alt="Photobucket
</a>

The white plastic knobbie seems to control the shutoff psi.


Can I replace this brass plug or any I flirting with danger?
Thanks
 
It looks to me as if your "plug" is the remains of a second pressure gauge... one to read tank PSI and one to read regulated PSI.

So trash it, already, and install a new gauge, or simply plug the unneeded hole in the regulator.
 
NOT "blowoff" PSI. One gauge will simply read tank pressure, the other pressure AFTER the regulator.
 
Bob is correct, the control circuits on the motor control set the working high and low limits. The safty blow off valve (with ring) is set at the max design pressure for the tank to prevent a faulty motor control from blowing up the tank. JimN
 
It is NOT a blow off gauge, it simply reads the non-regulated air pressure in the tank. Nothing special about that air pressure gauge.HTH

Keith & Shawn(Gold Medal Winner)
 
First thing I see is it looks like the gauge pointer has been pinned and bent.The ring is part of the safety valve.You should pull the ring when theres no pressure in the tank to make sure the valve isnt seized up,Compreessed air is full of moisture.You have a small bomb there so you better understand its use.The switch on the motor controls the shutoff pressure.
 
I agree that it should have another gauge there and the tow gauges one will tell you the [pressure in tank and the other for line pressure, controlled by the knob.
 
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