Question about Northern Industrial 2 Hp Twin Tank Electric Air Compressor

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Why does my compreeor switch release the air after reaching the required pressure instead of holding the air at the required pressure??? I've just purchased and fitted a new automatic cut off switch to my compressor! you can set the switch to cut out at whatever pressure you require, however no matter what pressure you set it to cut out at, it releases the air from the tank when it cuts, out untill the air pressure drops to the where it switches the pump back on to build up pressure again! Why is it releasing the air after the cut off switch switches the pump off instead of holding theair to maintain the pressure???

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There are two valves in play here. There is a relief valve that opens when the motor kicks off to release the pressure in the compressor itself. That is normal, and is required so that the motor can restart next time without having to overcome that pressure. The other valve is the problem. It is a reed valve between the compressor and the tank. This valve's job is to prevent the air in the tank from returning to the compressor. Think of it as a ratchet for the air. It is this reed valve that has failed.

Posted on May 27, 2010

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Its usually called a downloader valve

Posted on Dec 10, 2012

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