Centrifugal Governors:
- Flyballs Governor:
Consists of two rotating weights (often metal balls) attached to arms pivoted in the centre.
- Watt Governor:
This speed governor contains two rods with ball weights pivoted about an axis.
- Porter Governor:
Includes two bell crank levers pivoted in the central vertical plane with masses placed at the bent portion.
Mechanical Governors (Inertia Type):
- Hartnell Governor:
Features a gear train and a heavy ball at the top of the governor assembly.
- Spring–Loaded Governors:
These speed governors utilize springs compressed in proportion to shaft speed.
- Flyweight Governor:
Contains adjustable rotating masses attached to springs and mounted on a rotating shaft
Hydraulic Governors:
- Consist of fluid chambers within which fluid flow and pressure changes alter actuator positions based on speed variations
Pneumatic Governors:
Employ flexible diaphragms actuated by air pressure changes resulting from speed-dependent airflows
Electronic/Digital Speed Governors
In modern applications, electronic systems utilizing sensors, microcontrollers, and actuators may also serve as speed governors, providing control through signals to the engine or machinery based on measured speed feedback
The exact appearance of a speed governor may vary between manufacturers and applications, but these descriptions and images provide representative examples of different speed governor styles
