When the speed of the machine increases, the balls of centrifugal governor 1 move outward and its sleeve is raised a long axis y-y, turning lever 2 about point A. This raises valve spool 3, admitting fluid to the lower end of the servomotor. As a result, piston 6 of the servomotor moves upward, turning lever 5 about fixed axis C to lower shutter 4 and reduce the supply of the heat-carrying agent to the machine. As piston 6 moves upward, it turns lever 2 about point B and shifts valve spool 3 downward. When the spool reaches its middle position, piston 6 of the servomotor stops. When the speed drops, the elements of the regulator operate in the reverse direction.
$3903$LHP,Rg$