Adjust the compressor to the minimum load pressure setting and turn the compressor off. Attach the valve directly to the air inlet valve on the tank. Sometimes the pressure buildup in the compressor tank far exceeds the maximum level, to avoid such undesirable and potentially dangerous situations a safety relief valve is placed in the unit. When you feel the air coming out the top of the valve that means you have set your bottom pressure setting. cut-in pressure, the pilot valve closes allowing the unloading device to close and the compressor once again pumps into the receiver. Pressure relief valves, or safety valves, are a simple but critical part in any air compressor system. This venting unloads the pump through the relief valve at low pressure, avoiding energy waste and Once you’ve determined the pressure, use a hand pump to raise it to a pressure equal that of your home’s water pressure. Relieve excess pressure or vacuum with one valve that can be configured for either application. As stated above this valve gets into action when the air pressure reaches a dangerous level. These valves begin opening at the set pressure or vacuum level and fully open at about 10% over the set point. Anywhere in the middle is good in my book. The air conditioning system is protected by a pressure relief valve, located on the end of the high side hose near the compressor. They begin closing as pressure or vacuum level drops and fully close when the system is restored below the set point. A pressure regulator is a very important factor of an air compressor. A suitable pilot valve may be used to “vent” the balanced piston relief valve when the system does not require power. When the refrigerant pressure reaches an abnormal level of 540 psi (3727 kPa), the release port automatically opens and releases refrigerant to the atmosphere. Turn pressure adjusting nut pressure. Evidently you can fix a pressure relief valve. Jim wrote… “My harbor freight compressor high pressure release valve was opening-releasing pressure at about 110 psi even though the compressor is rated to 125 psi. Adjusting the Bendix D2 governor just takes a 7/16 wrench and a screwdriver. Increasing the pressure setting above the factory settings on an air compressor will lead to an early failure of the compressor, and may lead to a catastrophic compressor failure. I am appreciative of Jim who posted the following information on this site in January. To do this properly, you’ll need an air pressure gauge to test the existing pressure of your expansion tank. This is because it is a control valve that will be able to reduce and increase the airflow that is coming out of the air compressors tank. This video will tell you how to adjust a Pilot/Unloader Valve for your constant-run air compressor. 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