How Does it Practically Work? A compressor unloader valve is a small part, typically measuring approximately 4-5 inches in length and width. Begin at a low setting by turning counterclockwise one full turn. On its own it’s a minor issue that’s easy to fix, but it can cause damage to the head gaskets if left unresolved. The compressor will constantly cycle while turned on and dump head pressure from head unloaders located at the top of the pump. Otherwise, read on. Top Rated Seller Top Rated Seller. KELLOGG AMERICAN UNLOADER VALVE FOR AIR COMPRESSOR MODEL 335 TV, 452TVX. The unloader valve releases when the pressure switch turns the motor off on the compressor. 1 If pilot valve does not unload as tank pressure approaches 135 PSI, slowly turn top end setting (4) counterclockwise until pilot starts to … $25.00 excluding shipping. with 1/8-Inch Bleeder Check Valve, Control Devices Brass Continuous Run Unloader Valve, New In tank Check valve for air compressor 3/8" comp x 1/2" mpt, CDN$ 5.21 for shipping & import fees deposit, Karcher 4.591-040.0 Unloader Spill Valve Assembly Complete 45910400, New Throttle Control Cable BullWhip for Gas Powered Compressor 24, I.E.E. You are seeing this ad based on the product’s relevance to your search query. If you follow the discharge tube from the head of the pump down to where it enters the tank, that’s where your check valve is located. After viewing product detail pages, look here to find an easy way to navigate back to pages that interest you. But then, before you get to use any air, it’s all leaked out again, and the compressor restarts to fill the tank again. 12 product ratings - Air Compressor pilot unloader check valve combo 100-125 with 21" control cable. On these types of air compressors the unloader valve is also now known as a throttle valve. system air to the compressor unloader port. 1/2" FPT Inlet TOP x 1/2" FPT Outlet bottom 30 scfm. I’ve looked all over the compressor and cannot find a check valve. Then do an Internet search for that part. An unloader valve malfunction is one of the more common air compressor issues. If pilot valve begins to rifle (sputter), fine tune differential setting (2) 1/16 turn in either direction until rifling stops. Simply install this unique valve in the compressor discharge line, and the Load Genie® does the rest! If pilot valve does not unload as tank pressure approaches 135 PSI, slowly turn top end setting (4) counterclockwise until pilot starts to unload prematurely (at 105 PSI). If you need help locating the check valve, email me at coreyn@rolair.com with the model number. Air Compressor Pilot check valve unloader combination discharge 1/2" Female NPT Inlet X 1/2" Male NPT outlet - ALL IN ONE VALVE FOR GAS POWERED COMPRESSORS (95-125 PSI) Loosen locknut (1) by turning counterclockwise several full turns. Would a compressor with a pilot valve also have a check valve?? This valve is also commonly called an inlet valve, intake valve , unloader and unload valve . Hi! For the standard top-end setting of 135 PSI, adjust differential (4) so that 3 threads show above locknut (3). $42.60 excluding shipping. $25.00 excluding shipping. Thanks for reading our post. Proceed to fine tuning instructions. It is small in appearance and has a very light weight. On my rolair, soon as the tanks are full and the engine goes to idle, a ton of air exits from the discharge exhaust. I’ll try this and we if it works. 141-1064 JENNY PILOT UNLOADER VALVE AIR COMPRESSOR PARTS. The piston compressor is an important part of the air compressor. This allows for air to escape and for an easy start when the pressure switch turns the motor back on. That excess air gets discharged to atmosphere until the tank gets depleted and needs to be recharged. Somehow your comment got past me. When my control valve reaches the cutout pressure. Or, remove the cover from the switch (unplug the compressor first) and locate the pressure switch part number. Is my valve faulty or could there be some kind of obstruction? Thank you. Anyway to fix or adjust this? Your email address will not be published. Turning (4) clockwise to increase the top end pressure setting or counterclockwise to decrease. The air compressor unloader valve is part of the reciprocating piston compressor. Available for Store Pickup (549) Categories. IN TANK CHECK VALVE AIR COMPRESSOR 3/8" COMPRESSION INLET X 1/2" MALE NPTOUTLET, ALL BRASS CONSTRUCTION, UNLOADER PORT, CDN$ 5.36 for shipping & import fees deposit, GAS Air Compressor Pilot check valve unloader valve combo 95-125 NSG7, CDN$ 13.77 for shipping & import fees deposit, Carbman Pressure Washer Pump Unloader Valve for 2500-3000 PSI RMV/RMW RMV2.5G30 RMW2.2G4, CDN$ 5.48 for shipping & import fees deposit, New Pilot Unloader Valve for Air Compressor 1/4 FPT - 140-175 PSI by CDI/Conrader/Steuby, CDN$ 5.64 for shipping & import fees deposit, Powermate Vx 031-0020RP 3/4-Inch NPT O.D. Thanks, Dave, I have an Emglo 60 gallon upright electric compressor. The diagram below shows the components of our most common piloted unloader valve, part number 131B. Turn top end setting (4) clockwise in 1/4 turn increments, tap down on internal rod at toggle and repeat until desired top end setting is reached. by Robert DeLaPlaza (Orlando Florida USA) I have a two stage compressor with an unloader valve, after several years of work the unloader valve got full of gummy residue, I think from the little amount of oil leaking from the compressor in to the tank. All the air in the tank is released and the engine stalls? By opening and closing the air intake, the capacity of a rotary screw compressor is regulated. The air compressor unloader valve is often located near the air tank of the unit and is usually part of the pressure switch assembly. Air is supposed to discharge from the piloted unloader valve when the compressor goes to idle. Of course, be sure to shut down the compressor and drain all tank pressure before doing so. After making contact, turn differential (2) counterclockwise. Gas Compressor Pilot Unloader Check Valve Combo 60CFM 145-175 PSI 1" Female NPT. The most convenient way to release this trapped pressure is to use Load Genie® combination check and unloader valve. There is likely no check valve in that configuration. 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. The air compressor unloader is valve is a small, but important, part of the reciprocating piston compressor. https://fix-my-compressor.com/the-air-compressor-unloader-valve It sounds like the check valve is leaking, likely due to some debris preventing it from sealing properly. Make sure the top toggle lever is in the down (horizontal) position. While the air compressor is running, the pilot remains closed until the pressure reaches the unload setting. 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