Oil type rotary screw unloader valve

this unit is a homan howden 2855 1265 and is only building about 40psi with discharge valve open. with it closed it will pump up to about 120 psi. at about 40psi the valve opens or closes i guess how ever you want to look at it.







Bill says...

Now you've gone and confused me? :-)

You say discharge valve...that's not the unloader valve.

The unloader valve is only supposed to open when the pressure switch toggles the compressor motor to off when the high pressure cut out level is reached.

If air is bleeding out of the unloader valve when the compressor is running, you either have a leaking check valve, or the unloader valve / pressure switch isn't working properly.

Good luck.

Bill

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