Unic URW295CUR, Workshop Manual

Page: 57 / 155

１－６）
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-up, hook-up,
boom retraction, and slewing C.W..
Raise
Up
Retract
C.W
Detects spool position
to apply signal input
to control box.
Pilot pressure
10.6 Oil flow in the valve body when boom up, hook up, boom retraction,
and slewing C.W. are functioning
Piston
Spool
Spool
Core
Pressure regulator valves
for each control element
Shuttle valve
Differential
transformer
1 Tank Tank
Proportional solenoid Ｏ
Raise,Up,Retract, C.W
Actuator port
Raise,Up,Retract, C.W
Actuator port
Lower,Down,Extend,C.C.W
Proportional solenoid ＯＦＦ
Lower,Down,Extend,C.C.W
Courtesy of Machine.Market