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The Flyball Governor ( or Centrifugal Governor ) shown in this video is animation of this device from a steam engine. Power is supplied to the governor from the engine's output shaft by a belt connected to the flywheel. The governor is connected to a throttle valve that regulates the flow of steam supplying the prime mover. This in turn regulates amount of pressure acting on the piston. As the speed of the prime mover increases, the central spindle of the governor rotates at a faster rate and the kinetic energy of the balls increases. This allows the two masses on lever arms to move outwards and upwards against gravity. If the motion goes far enough, this motion causes the lever arms to pull down on a grooved collar, which moves a operating arm, which reduces the aperture of a throttle valve. The rate of working-fluid entering the cylinder is thus adjusted and the speed of the prime mover is settled in new position, preventing over-speeding or stalling the engine.
Mechanical stops may be used to limit the range of throttle motion which is not shown in this animation.

Flyball Governor