The turbine shaft speed maintained by the regulator can be changed by adjusting the tension of spring 1, linked through lever 3 to sleeve 2 of the centrifugal governor. At a constant turbine load, if the tension of spring 1 is increased, sleeve 2 moves downward. At this, lever 3 turns about point A, shifting valve spool 5 upward. This directs hydraulic fluid so that piston 4 and valve member 6 move downward, increasing the supply of steam to the turbine. At constant load, the speed of the turbine shaft increases and sleeve 2 of the governor and, consequently, valve member 6 move upward, returning to the initial position. Thus the steady-state condition of the turbine at constant load corresponds to a higher speed. If the tension of spring 1 is reduced, the speed of the turbine shaft drops at constant load.
$4247$CHP,Rg$