To limit the amount the regulating member is opened, the regulator system is supplemented wit four-bar linkage 1, 2 and 3, which is linked to the rod of piston 4 and is supported by screw 5. Using screw 5, the stroke of the servomotor piston can be limited to any amount of opening the regulating member. When the speed of centrifugal governor 6 is reduced, valve spool 7 is shifted upward. Fluid from the valve is delivered to the left end of servomotor 8, moving piston 4 to the right, in the direction of opening the regulating member. Lever 3 is turned about point O, and its tip a can contact point A of the valve spool stem. This limits the amount valve spool 7 can be shifted upward, in the direction in which piston 4 is moved to the right to open the regulating member.
$4261$CHP,Rg$