If a higher volumetric flow rate should be required, two vacuum pumps are used. The maximum negative pressure that can be achieved with conventional vacuum pumps is about 0.9 bar. According to [Ney2005], high-performance combined high-pressure flushing and suction vehicles should be equipped with vacuum pumps with a volumetric flow rate of 1,500 m3/h and generate vacuum of a maximum 0.9 bar (90 % at sea level).
Most commonly used vacuum pumps include the liquid ring pump and the rotary vane pump. In comparison, the rotary vane pump exhibits poorer performance and has a higher wear factor as a result of the mechanical contact between internal components, which require lubrication. Due to noise emission, acoustic insulation is also indispensable. Advantages of rotary vane pumps include their modest purchase price and low tare weight.
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