The governor is in two sections comprising the governor valve and its spring and a bob-weight retained by a "C" clip.
It operates by centrifugal force in two stages.
In the first stage at lower road speeds, the bob-weight and valve can be considered as forming one unit.
Rotation of the governor throws out the bob-weight and this causes the valve to uncover the line pressure supply port so that fluid under pressure flows through the port and exerts a thrust on the face of the valve.
This thrust increases until it is capable of closing the valve against the opposition of the centrifugal force.
The action of the valve produces a fluid pressure at the outlet which is proportional to the force acting on the bob-weight.
Any increase in speed will cause these events to be repeated but as the speed is greater the pressure required to close the valve must also be greater.
For any given value of line pressure, the result is a governor pressure which increases with speed.
The second stage starts when the bob-weight stop contacts the body.
From this point onwards, the balance between the opening and closing of the valve is achieved by the centrifugal effect on the valve and the fluid acting on the pressure face of the valve.
