水泵底阀接合面都是采用平面加衬垫密封,如图1。在关停水泵后,特别是高扬程水泵,由于管路的回水压力大,且同时伴有冲击力,故经常发生底阀接合面间的衬垫被冲坏的故障,造成底阀严重漏水,只好把底阀从水中拆上岸检修。尤其是大口径水泵的底阀较重,增加了检修工作量。 Pump bottom valve joints are used plane and gasket seal, shown in Figure 1. After shutting down the pump, especially the high-lift pump, due to the pipeline backwash pressure, and at the same time with the impact, it is often occurred at the end of the valve sealing surface between the pad was damaged failure, resulting in a serious leakage at the end of the valve , Had to remove the bottom valve from the water shore repair. In particular, large-diameter pump at the end of the valve heavier, an increase of maintenance workload.