Vacuum pump assembly with built-in shutoff valve

摘要

A vacuum pump assembly is provided which includes a built-in pneumatic valve for closing the suction port of a vacuum pump of the assembly with an auxiliary valve being provided for controlling operation of the pneumatic valve. An electromagnetic valve is utilized as the auxiliary valve and a generator coupled with the shaft of the vacuum pump generates electric current in accordance with the operating stages of the pump in order to control the auxiliary valve.