Flow Control Valve Open (page 2 of 4)

Mounted on the lower side of the gearbox is a 4-way valve that is moved horizontally by a pin on the pinion holder to shift fluid pressure to the right or left side of the power cylinder when the steering wheel is turned. It has thrust pins at both ends, and two inter-connected reaction chambers, one on each side.

Each reaction chamber contains a pair of spring loaded plungers that rise against right and left thrust pins. The valve body fluid passages are controlled by the 4-way valve.

Fluid pressure in the reaction chambers is reduced by the gain control valve in order to change the amount of the assist in accordance with the change of car speed.