VACUUM PUMP, IN PARTICULAR ROTARY-LOBE PUMP

摘要

A vacuum pump such as a rotary-lobe pump has a pump chamber (10) in which pump elements (12) are arranged. A pressure side (30) is connected to a suction side (20) of the pump chamber (10) via a connecting duct (22). Furthermore, a valve device (24) is arranged in a passage opening (32) of the connecting duct (22). To vary the effective cross-sectional area of the passage opening (32), the valve device (24) is, in one of the preferred embodiments, assigned an adjustable aperture device (42).