Upon a change in speed of the shaft being regulated, the sleeve of centrifugal governor 1 moves up or down, shifting valve spool 2. Fluid from the valve is delivered to one end of servomotor 3, moving piston 4 up or down. This shifts valve spool 5 and fluid from the valve is delivered to one end of servomotor 6, moving piston 7 up or down. Piston 7 controls valve member 8, which regulates the amount of steam supplied to the turbine. The use of two servomotors increases the actuating force that operates the regulating member. Feedback levers 9 and 10 shift the housings of the valves, returning them to the neutral position.
$4260$CHP,Rg$