The pressure switch on the right incorporates an ON/OFF lever on the right side as well. In the photo below the unloader valve connections are the brass fittings on the left sides of these Lefoo brand pressure switches. Reciprocating air compressors always have an unloader valve. A reciprocating air compressor will have at least one cylinder, and often may have two or sometimes even three cylinders. This Fix My Compressor website is focused on the do it yourself and small workshop air compressor and most of these are reciprocating type air compressors. What the air compressor unloader valve doesĬompressor unloader valves are common pieces of equipment on many types of air compressors including reciprocating, rotary screw and even gasoline or other fossil fueled air compressors. If the unloader valve has failed when the motor tries to start quite often the motor will lug (struggle) to start and typically a breaker will trip or a fuse will blow. ![]() ![]() When the the air compressor unloader valve is working correctly, the pressure in the tank has dropped to below the normal cut in pressure level of the pressure switch, the pressure switch trips to allow power to flow through it, and the motor starts. The air compressor unloader valve provides a critical function in preparing your air compressor to restart.Ī failed air compressor unloader valve is one of the most common reasons why your air compressor cannot restart after you have used air from the compressor tank. Hey! This site is reader-supported and we earn commissions if you purchase products from retailers after clicking on a link from our site.
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