Campbell Hausfeld CW207551AV Pressure Switch Four Port Adjustable Unloader

Campbell Hausfeld CW207551AV is a four-port adjustable pressure switch with an integrated unloader, designed to regulate cycling in air compressors by controlling cut-in and cut-out pressure and venting residual air when the unit stops. The four-port configuration provides separate connections for the supply, tank, and unloading lines, enabling reliable shutoff and flexible plumbing within Campbell Hausfeld CW-series systems. The built-in unloader valve serves to vent remaining air to ease restart and reduce pressure fluctuations, helping the compressor reach the target pressure smoothly and discouraging short cycling. This unit is intended as a direct replacement part for Campbell Hausfeld compressors that use CW-series pressure switches, combining standard electrical switch functionality with pneumatic unloading to maintain consistent pressure control and minimize wear associated with start/stop cycles.