The air compressor unloader valve is often located near the air tank of the unit and is usually part of the pressure switch assembly. Of course, you need to learn how to adjust unloader valve on pressure washer. Shut off the power to the compressor. Secure the pressure screw locknut. Well, the job of adjusting the unloader valve is not a daunting one. 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! This is evidenced by the continuous hissing sound that you will hear. Centrifugal Unloader valve leaking when stopped Adjust or replace unloader Replace in-tank check valve Hydraulic Unloader Faulty 7 Hydraulic unloader valve passes air to suction unloader when running oil pressure less than 15 psig Hydraulic unloader valve passes air to suction This releases any amount of air that is trapped over the piston. Be careful! They are typically located on the side of the compressor tank or near the top situated to one side of the air outlet. That’s where the unloader valve comes in. Basics Of Pressure Washer. Plug the compressor back in. Air compressors are everywhere! 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. 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. There is no adjustment … The unloader valve opens when the pressure reaches cut-out, and stays open until the pressure in the tank reaches the cut-in pressure level. When the pressure in the compressor tank drops to the cut in pressure setting on your pressure switch, the pressure switch will trip again, and this time the arm or finger will typically release the pin on the unloader valve allowing it to shut, and prevent the air that is being compressed … This arm or finger is further connected to the small valve pin which controls the air compressor unloader valve. Of course, you need to learn how to adjust unloader valve on pressure washer. Air continuously leaks out of the unloader valve on your air compressor, and this is a problem…. If it is sending air to it you need a governor, if it is not than you need a unloader valve. Turn off power to the compressor or unplug it. Common problem: Air compressor unloader valve leaking. This is the ssssssshhh sound you will here when the compressor stops. Compressor valves at Grainger include unloader, pilot, pressure relief valves and more. CAP#: 18267 Air compressor elbow unloader valve fits most Kellogg American, Pumps 335tvx , 452tvx Simply remove old valve, install new valve and adjust. The valve includes a pilot valve, discharge unloader valve, and check valve. When the compressor stops, the pressure in this pipe is blown off to 0 bar (atmosphere). Unscrew both locknuts and remove the adjustment from … That’s where the unloader valve comes in. Since the unloader valve provides a critical function in the restarting of an air compressor you need to know more about your air compressor unloader valve or answers to any unloader valve issues your compressor has, … I just picked up a small dental compressor (Duerr Dental Tornado 130) that seems to have a bad unloader valve. Air compressor unloader valve. Locate the safety relief valve. The problem is when I got it, it was missing the air line that goes to the suction unloader valves. To make a compressor pressure switch adjustment you will need to remove the cover from your pressure switch. The how-to video below shows how to adjust a pilot unloader valve, or click on this link to view the downloadable .pdf instructions: 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. Compressor Pressure Switch Adjustment. I got a manual for the compressor, but its just for the pump, and does not show the air line connections.