Unic URW295CR, Maintenance Manual

Page: 47 / 125

10.5 Oil flow in the in‑out body when hook storing relief
valve is being functioned by hook storing operation
（１０−５）
Main relief valve opens when the hook has been stored
and the relief valve for storing hook is actuated.
Oil fed out of pump, while generating pressure
of 6Mpa, allows surplus oil to flow into the tank.
Ｐ1
Pilot pressurer
3MPa
Spool
Main relief
valve
Pressure reducing
valve
Emergency screw
Solenoid valve for unloading
Relief valve
for storing hook
Solenoid valve
for storing hook
Pressure regulator valve
Back pressure valve
Tank
Set‑bolt
Core
P1
Solenoid valve
for storing hook Relief valve for storing hook
3.9MPa(40kgf/cm )
2
Solenoid valve
for unlading
pressure reducing valve
Pump
Tank
Main relief valve
Back pressure valve
Pressure regulator
valve
Emergency screw
(stop valve)
3.0MPa
(30kgf/cm )
20.6MPa(210kgf/cm )
Set‑bolt
(stop valve)
G.P
Pailot pressurer
G.P
1.0MPa
(10kgf/cm )
1.0MPa
(10kgf/cm )
2
2
2
2
Feedback
Working pressure
of pump is maintained
at 6Mpa or less.
Feedback
Primary
pressure
Secondary
pressure
Working
pressur