Flywheel:

1] Suction (1st stroke)

2] Compression (2nd) flywheel clockwise (store energy)

3] Power (3rd) flywheel anticlockwise (release energy)

4] Exhaust (4th)

Diagram

GOVERNORS:

$\rightarrow$ Classification:

Important terms:

1] HEIGHT OF GOVERNOR: It is vertical distance measured from the centre of balls to the point of intersection of upper arms or arms produced on the axis of spindle.

2] RADIUS OF ROTATION: It is the horizontal distance from the axis of rotation to centre of ball mass, at any speed.

3] SLEEVE-LIFT: It is the vertical distance travelled by sleeve due to change in equilibrium speed.

4] EQUILIBRIUM SPEED: It is the speed @ which governor ball, arms are in complete equilibrium and there is no any moment of sleeve upward or downward.