在我省中小型泵站中,管道出口拍门多为普通上挂拍门的结构型式(即拍门轴安装在管道出口正上方部位),这种拍门由于自重作用,管道水流阻力损失较大,特别是在拍门较重的情况下,影响到泵站出流。为了减少出口阻力,可增加平衡锤,很多站就把拍门用绳索吊起。这样,当水泵发生事故突然停机时,倒泄水流将使水泵机组倒转,往往使设备因水锤作用而造成破环。例如我市神刘扬水站 In our province, small and medium-sized pump station, the pipe outlet beat the door to take the door for the general structure of the type (ie, the filming of the door shaft is installed in the pipe outlet just above the site), the door due to self-weight, pipeline water flow resistance loss than Large, especially in the case of heavy door, affecting the pumping station outflow. In order to reduce the export resistance, can increase the balance hammer, many stations took the door with a rope lift. In this way, when the water pump accident suddenly shut down, pouring water flow will reverse the pump unit, often make the device due to water hammer caused by broken ring. For example, my god Liu Yang water station