The turbine shaft speed can be changed at any load within a narrow limit by adjusting valve sleeve 1 with respect to valve spool 2, using handwheel 3. In this case, the position of valve spool 2, corresponding to steady-state load on the turbine, for the same position of servomotor piston 4 (which corresponds to the opening of the regulating steam supply valve), must be changed to the new position of sleeve 1. This changes the position of sleeve 5 of the centrifugal governor. Since movements of the governor sleeve are associated with changes in turbine speed, the same load can be carried at different speeds.
$4249$CHP,Rg$