Campbell Hausfeld ST128402AV Air Compressor Unloader Valve

ST128402AV is a genuine Campbell Hausfeld unloader valve built as the official replacement part for Load Genie air compressors. This valve features two 1/2 in. ports (1/2" x 1/2"), making it a direct, compatible replacement for Campbell Hausfeld units that use the ST128402AV configuration. The unloader valve is used during compressor cycling to vent residual air from the pump head when the unit unloads, reducing the starting load on the motor and promoting smoother restarts. As an OEM component, it’s designed to integrate with existing plumbing in Load Genie platforms and similar Campbell Hausfeld applications that employ pilot/unloader control. Install this part to restore proper unloading action and consistent pressure-switch cycling, particularly on compact portable compressors and small shop models that rely on a dedicated unloader valve to manage head pressure after shutoff. The ST128402AV part number identifies a precise, factory-specified valve, ensuring compatibility with the original design and maintaining expected performance characteristics of Campbell Hausfeld systems.