BG-Valve 131B Pilot Unloader Valve Factory setting 95 -125PSI – 131B Pilot Unloader Valve for Compressors Pressure Adjustable Rolair - Jenny - Emglo New Air Compressor piloted unloader valve 95-125 Rolair 131b 5131609-00 Emglo PVMA Jenny 141-1064 1/4" Compression inlet x 1/4" Male outlet Piloted unloader valves are used in constant speed applications where there are no intake unloaders present. They incorporate a discharge unloader on the body of a pilot valve to allow one valve to sense system pressure and vent discharge air to atmosphere. At load pressure, the pilot valve closes the discharge unloader and the compressor returns to normal operation.