水泵无底阀,用真空泵辅助上水的方法,自三十年代至四十年代就有应用的。但一直没有普遍应用,而且局限于大型水泵。 水泵运行前充填“引水”主要是用水起密封液的作用,水泵运行时能形成所需的真空。为使水泵在运行前能在京腔内充满水,人们就在水泵的进水端装一个底阀,这底间就是 Pumps without bottom valve, with a vacuum pump to assist the water method, from the 1930s to the forties have applications. But it has not been widely used, and limited to large pumps. Pump filling before the operation of “diversion” is the role of water from the sealing liquid, the pump can form the required vacuum operation. In order to make the pump in operation before the Beijing Cavity filled with water, people in the water inlet end of the pump installed a base valve, which is the end