Industrial ST065700AV Air Compressor Unloader Valve

ST065700AV is a 5/16" tubing air compressor unloader valve built as a direct replacement for Campbell Hausfeld models that use this size of unloader tubing. The unloader valve is part of the compressor’s unloading sequence: when the pressure switch stops the pump, the valve vents compressed air from the pump head to atmosphere, easing the motor's restart by reducing the start-up load. This part is specifically associated with 5/16" tubing connections and carries the ST065700AV designation for ordering and compatibility. In replacement catalogs and retailer listings, you’ll find ST065700AV listed alongside other 5/16" tubing unloader valves for Campbell Hausfeld air compressors, including related part numbers like TF038300AJ, indicating its role as a serviceable replacement in the Campbell Hausfeld family. Typical applications include replacing a worn or leaking unloader in 5/16" tubing circuits on small to mid-sized Campbell Hausfeld compressors used in home workshops or garages. By keeping the unloading function intact, this valve helps maintain reliable start-ups and consistent cut-out pressure, contributing to overall compressor performance without altering other electrical or mechanical components.