The problem is when I got it, it was missing the air line that goes to the suction unloader valves. Once the air pressure in the air compressor tank reaches a predetermined level, the check valve trips the motor to turn it off, triggering the air compressor unloader valve to open. Basics Of Pressure Washer. Does anyone know what typically goes wrong when an unloader valve dies? Unloader valves combine all of the components required for a continuous run compressor application: a pilot valve, a vent valve and a check valve. When you feel the air coming out the top of the valve that means you have set your bottom pressure setting. When that happens, the pilot opens and pressurizes the unloader valve, causing the unloader valve to open and excess air from the compressor to vent to atmosphere. The unloader valve is a small part of a pressure washer that plays a big role in controlling the strength of the water coming out of your pressure washer. When this happens, this means that the valve probably has a leak. Air continuously leaks out of the unloader valve on your air compressor, and this is a problem…. The valve is approximately 1/2 inch across and stands out from the compressor approximately 3/4 of an inch. That’s where the unloader valve comes in. As the compressed air is used and the pressure drops to the load setting, the pilot closes and depressurizes the unloader valve. This will effectively emulate the operation of the unloader valve, as any air trapped over the piston will flow into the tank as the tank pressure drops. Locate the safety relief valve. You can do it on your own! When the compressor stops, the pressure in this pipe is blown off to 0 bar (atmosphere). The valve includes a pilot valve, discharge unloader valve, and check valve. To make a compressor pressure switch adjustment you will need to remove the cover from your pressure switch. Failure to do so could result in serious injury. The air compressor unloader valve is often located near the air tank of the unit and is usually part of the pressure switch assembly. why? If your electrically powered air compressor is having a hard time starting, try pulling the power cord, and opening the drain valve to void all air from the tank. To do that safely and like a pro, you need to learn how to adjust the unloader valve on the pressure washer. If you have questions, call us toll free at 1-800-310-3573. The pressure switch trips in response to the low pressure, turns on the electric motor, and at the same time, closes the unloader valve. Compressor valves at Grainger include unloader, pilot, pressure relief valves and more. It pumps up fine from empty but the motor lugs and it … Save money and troubles by learning how to set your air compressor pressure switch the right way! 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