There is no unloader valve on my compressor shutoff switch?
Dear Bill,
I have a 30 gal Montgomery Wards, 230 volt air compressor that I purchased new in the mid 70’s.
The original pressure switch (manufactures) does not have an unloader switch, nor does the compressor have any plumbing to add one. Every replacement switch I can find has an unloader valve. What is my solution to replacing the pressure switch?
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Pressure switch without unloader
Hi Tom…
If you visit Square D Pumptrol Water Pump and Air Compressor Pressure Switches you can find them without unloader valves.
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Can I use a switch with an Unloader valve if older compressor did not have one?
Have same situation as Tom with older large dual tank snap on compressor with failing air pressure switch.
The air pressure range is 90-120 and there is no Unloader valve or plumbing for one. Have been looking at the Square D ones (9013FHG59J69) and it seems most have a 2 way pressure relief valve. Is this the same as a Unloader valve?
The main question is could I replace the current switch I have with one that has a Unloader valve and just not hook up the valve or disable the valve somehow?
The compressor is 110 v and still runs well.
Thanks for your help on this it is much appreciated.
