stone wrote:

I have a home brew air compressor which uses
an electric motor. It uses a pressure switch
to stop the motor when the tank reaches full pressure.

I'd like to put a small gas motor on the compressor
because the electric motor usually gets hot and
shuts down.

How are gas motor air compressors controlled?

You cannot start and stop the gas motor, so, is there
some sort of dump valve that opens when the tank
reaches pressure?

I want to use a gas engine, but I don't want to rely
on the overpressure valve for normal ops.

Thanks.




You will need a pressure valve that will feed air to a throttle down
valve to throttle down the gas motor. They ususally use an air cyilnder
attached to the throttle. The second thing you will need is an unloader
valve that dumps out the pressure in the cylinders so the gas motor can
idle with no load. A series check valve in the output of the compressor
and a dump valve on the line between the compressor and the check valve
will accomplish this. The dump valve opens when the pressure is at max.
and is operated by the pressure valve. Take a look at a factory built
unit and see how they got it hooked up.

John