Roots pumps WA/WAU 501 standard series rotary lobe blower vacuum pumps are driven by an air-cooled motor. They have shaft seals that lead to the atmosphere and the pump is connected to an air-cooled motor. WAU pumps are easy to operate! They include a differential pressure valve that allows them to start at the same time as the roughing pump. If the pressure difference between the flanges is too high, the valve will open. And then a portion of the pumped gas flows through this line back to the intake flange. Therefore, the pump may be turned on at atmospheric pressure with the backing pump. This increases the pumping speed of the pump combination at high intake pressures

罗茨泵 WAU 251 标准系列罗茨鼓风机真空泵由风冷电机驱动。它们具有通向大气的轴封，泵连接到风冷电机。WAU泵易于操作！它们包括一个压差阀，允许它们与粗加工泵同时启动。如果法兰之间的压差太大，阀门将打开。然后一部分泵送的气体通过这条管线流回进气法兰。因此，可以使用前级泵在大气压下打开泵。这提高了泵组合在高进气压力下的抽速