Hydraulics QUANTUM TIC
11-90 10/04
4.4 4/3 way Proportional solenoid valve
P Tractor port (feed line)
T Tractor port (return line)
A Consumer port (reverse)
B Consumer port (forward)
S Bore
K Control spool
V Pilot valve
Y Control bore
10 Non-return valve
11 Load change valve
M1 Solenoid coil (proportional control)
Neutral Solenoid coil (M1) is switched off.
The circulation pressure (P) is available at control spool (K) and at the pilot
valves (V) via bore (S).
The control oil returns to the tank (T) via the load change valve (11).
Floor conveyor forward Solenoid (M1) is controlled proportionally from the switch console by
means of a potentiometer via the electronic unit. The iron core pushes the
spool in the pilot valve (V) open against the spring.
This opens the connection from (P) to the control spool (K) via bore (S)
and pilot valve (V).
Pressure is applied at the bottom face of the control spool (K) and
actuates it upwards against the compression spring.
Volume flow now flows from P to the hydraulic motor via port (B). The
return oil from the hydraulic motor flows to tank T via port (A).
The control of the control spool (K) depends on the oil quantity available at
the control spool (K).
The longitudinal bore in the control spool (K) connects B with the
circulation valve spool (5) of the upstream valve via the load change valve
(11).
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