Subject: Re: Problem with airbrush refrigeration type compressor

From: jgraham <[email-masked]>
Date: 4 Dec 1996 05:26:24 GMT

> This is caused by air pressure against the piston that provides resistance
> that cannot be overcome by the motor starting torque. If you have a tank
> then it should have a pressure switch to control the cut-in and cut-out
> pressures. These switches can be had with a relief valve that bleeds the
> air out of the cylinders when the pump stops, thereby facilitating a
> sucessful restart (thats a mouthful). You will need to install a check
> valve between the compressor and the tank to prevent bleeding the tank
> down through the relief valve.
> 
> You should also have a safety valve on the tank to vent it if the pressure
> switch fails (on).
> Orest
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Concur with the observations made by Orest.  There are lots of 
compressors that will NOT start against a load.  That is, they must have
an empty tank upon starting.  The manufacturer has specifications 
for their products.  If they are not available, just know that your
compressor will not start against a load.  You must discharge the 
air tank before engaging your compressor.  This does not disqualify 
your compressor for some purposes.  It is just a design feature.
                                       J. Graham
                                       Texas - NO STATE INCOME TAX
                                               AND A $2.7 BILLION
                                               BUDGET EXCESS.