INLET VALVE WITH A CHOKE EFFECT AND MULTI-STAGE PISTON VACUUM PUMP

摘要

The invention concerns a vacuum pump (1) having an inlet (3) and an outlet (4). According to the invention, in order to prevent disturbance from excess pressure in the pump (1) when it is started, a differential-pressure-controlled inlet valve (52) is provided which chokes the pumping capacity at high inlet pressure.