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How does a Flyball or Centrifugal Governor Work?

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

Miguel Rodríguez
26 Feb 2013

Dear Sirs, I teach control systems and I have found their animation on youtube. I'd love to put the video on my virtual teaching materials. Working in a public institution of Venezuela. This is the Simon Bolivar University. Actually it would be very productive for my students watch the video, If you give me the right to publish your video, of course I would respect your copyright and put the source of the material. Thank you. I await your response

Mohammed Mubeen
10 Mar 2014

I like it. I want to use this animation.

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