Upon an increase in engine speed, balls a of centrifugal governor 1 move outward, shiftinig valve spool 2 to the left. At this, pump 3 delivers hydraulic fluid through the valve to the left end of cylinder 4, moving piston 5 to the right so that contact d, mounted on piston rod 6, makes contact with contact b, switching on the mechanism for increasing the pitch of the propeller. When the pitch is increased, the speed of the engine is reduced to the preset valve. Fluid from the right end of cylinder 4 and from the valve is discharged to the suction line of pump 3. Upon a reduction in engine speed, valve spool 2 is shifted to the right by spring 9, blocking off fluid delivery to cylinder 4. Then spring 8 moves piston 5 to the left, closing movable and stationary contacts, d and f, to switch on the mechanism for reducing the propeller pitch. Relief valve 7 protects the system against overloads. The regulator can be set up for any required engine speed by turning lever 10 which, through gear rack 11, regulates spring 9.
$4264$CHP,Rg$