Interstate Pneumatics, CVD7049, Pilot Unloader / Discharge Valve for Air Compressors
Piloted Unloader valves combine a pilot valve and an unloader valve to run an air compressor for continuous operation. In operation, the pilot remains closed until the pressure reaches the unload setting. The pilot then opens and pressurizes the unloader valve. This causes the unloader valve to open and vent the excess air from the compressor to the atmosphere. As the compressed air is used and the pressure drops to the load setting the pilot closes and depressurizes the unloader valve. The unloader valve then closes, and the pressure begins to build again and repeats the cycle. This can be used on gas engine or electric motor driven air compressors.
