Upon an increase in the speed of the hydraulic turbine runner, the sleeve of centrifugal governor 1 moves upward, shifting valve spool 2 downward. Hydraulic fluid from the valve is directed to the right end of servomotor 3, moving piston 4 to the left, in the direction in which the regulating member is closed. At this, deflector 5, linked by a lever system to the rod of piston 4, cuts into the jet from the nozzle, deflecting a part from the runner and thereby reducing its speed. Cam 6 actuates roller a, shifts valve spool 9 downward, and fluid from the valve is directed to the right end of servomotor 7 through flow-control valve 13. This moves piston 8 to the left, in the direction in which the opening in the nozzle is closed to some extent by throttling needle 10, thereby reducing the rate of flow through the nozzle. Owing to the provision of flow-control valve 13, the needle moves slowly to prevent a drastic increase in water pressure in the inlet pipeline. Feedback levers 11 and 12, as well as 14 and 15, return valve spools 2 and 9 to their central positions.
$4245$CHP,Rg$