Hydraulics QUANTUM TIC
11-92 10/04
4.5 4/3 way solenoid valve
P Tractor port (feed line)
T Tractor port (return line)
A Consumer port
B Consumer port
S Bore
K Control spool
V Pilot valve
Y Control bore
10 Non-return valve
11 Load change valve
M3 Solenoid coil
M4 Solenoid coil
Neutral Both solenoids are deactivated.
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 T via the load change valve (11).
Pressure build-up port B Solenoid (M3) is activated.
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 face end of control spool (K) and actuates it
against the compression spring.
Volume flow now flows from P via port (B) to the seated valves 15 in the
right block.
The return oil from the seated valve 27 in the left block flows to tank T via
port (A).
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).
Pressure build-up port A Solenoid (M4) is activated.
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).
The pressure in the right spring space of the control spool (K) actuates
control spool K.
Volume flow now flows from P via port (A) to the seated valves 27 in the
left block.
The return oil from the seated valve 15 in the right block flows to tank T
via port (B).
The longitudinal bore in the control spool (K) connects port (A) with the
circulation valve spool (5) of the upstream valve (load signal line Y) via
the load change valve (11).
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