DCE80-100E
Technical Handbook
Steering system
Description
20
P.Group 70
TDCE01
04GB
Orbitrol steering valve
The steering valve is of the closed centre, non-reaction type with
load sensing signal connection to the valve block. The load signal
gives load-dependent control of the fluid pressure from the valve
block to the steering valve. The type closed centre implies that it
closes for flow of fluid between the pump and reservoir in the neu-
tral mode. This is necessary to enable signal pressure to be con-
nected to the steering valve.
The steering valve consists of a gear pump and a distribution
valve. When the steering wheel is turned, fluid is supplied from
the valve block via the gear pump to the distribution valve which
ensures that the flow of fluid will be supplied to the port corre-
sponding to the direction in which the steering wheel has been
turned. Due to the gear pump, the flow of fluid supplied to the
steering cylinder is proportional to the angle through which the
steering wheel has been turned.
A valve block with built-in double shock and suction valves is con-
nected to the steering valve. The shock valves opening at 280
bar, prevent pressure surges caused by blows against the
steered wheels from being propagated to the steering valve. The
suction valves open to prevent vacuum on the opposite side of
the piston, which could lead to cavitation.
1. Steering valve
2. Valve block
3. Double shock valve with suction valve
4. Check valve
Steering valve with valve block
To Next Page
Loading...
