The high pressure coming from the pressure distribution valve (see Pl.16) is passed to one side or the other of the piston via two slide distributors. As the piston is connected to the rack, the high pressure will assist the pinion to turn the rack.

At the time of a movement of the steering wheel, the track rod acts on the slide (1) freeing the slide (2) which goes up under the action of its spring.

The slide (1) (inlet position) establishes the connection from the store of pressure - > chamber (A).

The slide (2) (return position) establishes the connection from chamber (B) - > tank.

The piston pushes the rack.

For turning right, the position of the slides is reversed as well as the direction of pushing on the piston.

If the wheel remains turned, the pinion driving the rack continues slightly in its rotation (stops pushing on the rack piston), which allows some freedom to the slide (1). This goes up closing the inlet. At the same time, the other slide (2) slightly pushes the return.

The balance point of the piston is reached and the rack keeps its position (not considering any external forces).