Unic URW295CR, Руководство по обслуживанию

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When electric current flows through the solenoid coil with
the output signal supplied out of control box, the core is
magnetized accordingly.
The spool in the solenoid moves upward leading the pilot pressure
to the piston which in turn allows the spool to move to the left.
This connects the return circuit to the tank and at the same time
connects the oil in P1 to the circuit actuating boom‑down, hook‑down,
boom extension, and slewing C.C.W..
10.7 Oil flow in the valve body when boom down, hook down, boom extension,
and slewing C.C.W. are functioning
Shuttle valve
Ｐ1
Actuator port
Raise,Up,Retract, C.W.
Actuator port
Lower,Down,Extend,C.C.W.
Differential
transformer
Pilot pressure
Spool
Tank Tank
Proportional solenoid ＯＮ
Raise,Up,Retract, C.W.
Proportional solenoid ＯＦＦ
Lower,Down,Extend,C.C.W
Detects spool position
to apply signal input
to control box.
Core
Pressure regulator valves
for each control element
Lower
Down
Extend
C.C.W.
Piston
Spool