Water-pressure controlled water inlet ball valve

The utility model relates to the technical field of high water head pumped-storage hydropower stations, in particular to a water-pressure controlled water inlet ball valve with a high water head. The water-pressure controlled water inlet ball valve comprises a water-pressure controlled hydraulic control operating device, a sewerage system, a hand-operated ball valve body, a maintenance seal fixing device, a filter water intake, a maintenance seal measuring device, an upstream steel tube, a pressure meter pipeline system, a differential pressure control pipeline system, a bypass pipeline system, a main valve, a valve switch indicating device, a locking device, a work seal measuring device, an expansion joint and an air exhaust device. The hydraulic control operating device comprises a crank and a servomotor. The servomotor comprises a lug ring, a cylinder barrel, a closed cavity, a piston rod and an open cavity. An orifice is formed in the side wall of the upper end of the closed cavity. Through a water-pressu