Operating pressure
Return line pressure
Design and Operation
4 Instructions on Design, Operation, Maintenance and Inspection
2.1 Forward steering motion to the right (piston with right-handed thread)
F
ig. 2
Valve rotor in
operating position
Steering wheel turned
clockwise
J Inlet slot
K Inlet slot
L Return slot
M Return slot
N Axial groove
O Axial groove
P Return groove
When the steering wheel is turned to the right, the piston will shift to the right (Fig. 2). A pressure
will now build up in the left-hand cylinder chamber which is a function of the steering effort re-
quired.
To achieve this, the control grooves of the valve rotor are displaced clockwise and the inlet slots
(K) are opened wider to admit the oil, while the inlet slots (J) are closed to the same extent and
thus obstruct the feeding of oil to the axial grooves (O) of the valve sleeve.
The oil will now flow through the inlet slots (K) to the axial grooves (N) of the valve sleeve and,
from there, will pass through the ball screw thread and flow to the left-hand cylinder chamber. The
closed inlet slots (J) prevent the oil from flowing off to the tank and, thus, cause a pressure to build
up.
The oil from the right-hand cylinder chamber is displaced. Via the opened return slots (M), it flows
to the return grooves (P) of the valve rotor. From there, it can at any time flow through the central
oil bore in the valve rotor and the worm and off to the oil tank.
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