The simple construction with only one shaft and a direct drive results in robust, long-life pressure-vacuum pumps with low maintenance and operating costs. The pressure-vacuum pumps work completely oil-free, the individual working chambers are separated by slides with a long service life. Suction filter and control valve are integrated in the pressure-vacuum pumps, additional accessories can be added without any problems. The blown air cooler, which is also integrated, guarantees a very low blown air temperature. The compact cover enables low noise emissions and low heat emissions.