Upon a change in speed of the turbine, the sleeve of centrifugal governor 1 is displaced up or down, thereby shifting, through levers 10, 11, 12, 13, 14, 15 and 16, the spools of three valves, 2, 3 and 4, in one direction. This actuates the pistons of servomotors 5, 6 and 7, which move three valve members and change the amount of steam admitted into the stages of the turbine. This does not vary the amount of steam being bled off. In case of a change in the amount of steam delivered to the first extraction unit, pressure regulator 8 actuates levers 15 and 16. This leads to motion of the valve spools of the second and third stage in one direction and the valve spool of the first stage in the other. If the amount of steam delivered to the second extraction unit is changed, second unit pressure regulator 9 actuates motion of the first and second stage valve spools in one direction and the third stage valve spool in the other.
$4226$CHP,Rg$