轴的密封形式有机械密封和填料密封两种。泵采用填料密封时，填料环的位置安放要正确，填料的松紧程度必须适当，以液体能一滴一滴渗出为宜。泵各液压钢坝  种密封元件装在密封腔内，腔内要通入一定压力的水，起水封、水冷及水润滑作用。
There are two types of shaft seal: mechanical seal and packing seal. When the pump is sealed with packing, the position of the packing ring should be placed correctly, the tightness of the packing must be appropriate, and the liquid can seep out one drop at a time. All kinds of sealing elements of the pump are installed in the sealing cavity. The cavity should be filled with water of certain pressure to play the role of water sealing, water cooling and water lubrication.v