1622377800 Unloader Intake Valve For Rotary Screw Air Compressor

Product Introduction

The valve that lets the machine start unloaded and walk in and out of load without slamming the line. 1622377800 is carried across parts channels as an unloader/intake valve assembly for GA75-class screw compressors, with 1622368800 and 1622368400 listed as related numbers. Pilot air shifts the internal element to throttle or close intake, release blowdown, and keep startup torque low. When the poppet sticks, the diaphragm leaks, or the pilot passage is dirty, the compressor loads hard, refuses to unload, hunts pressure, or trips on over-pressure with no real high pressure present.

Most "intake valve faults" are actually upstream—blowdown solenoid, pilot line, or controller output—so check those before condemning the assembly. On replacement, match flange pattern, port size, actuator type, and spring setting to the removed valve; a physically similar body with the wrong opening curve will never regulate correctly. Also called intake valve, suction control valve, unloader valve assembly.