目前,国内高水头水电站(H>150m)水轮机进口主伐普遍采用球形伐,其典型结构为双面活动密封硬止水式,即球伐工作止水采用活动堵水盖形式,为油压自动控制操作;检修止水(上游侧)采用活动圆筒形式,为水压手动操作。此型式球伐为国际上五十年代典型产品。对于多泥沙电站,由于泥沙磨蚀造成水轮机导水机构漏水严重时,机组停机靠关闭 At present, the dome-shaped cutting method is widely adopted for the import of turbines of high-head hydropower station (H> 150m) in China. Its typical structure is double-sided movable seal hard stop, that is, Operation; overhaul water (upstream) in the form of an active cylinder, manual operation for water pressure. This type of ball cutting for the typical products of the 1950s. For the multi-silt hydropower station, due to sediment erosion leading to water leakage turbine hydraulic system serious, the unit shutdown by closing