Komatsu Galeo BR380JG-1E0 Shop Manual page 132

SEN01352-00
Introduction of LS pressure
1. Hydraulic pump
2. Main spool
3. Pressure compensation valve
4. Valve
5. Check valve
6. LS circuit
7. LS shuttle valve
Function
Introduces the upstream pressure (down-
q
stream pressure of the spool meter-in) of pres-
sure compensation valve (3) and leads to LS
shuttle valve (7) as the LS pressure.
Connected to actuator port (B) through valve
q
(4), and makes LS pressure
pressure.
Inlet pore (a) inside main spool (2) has a small
q
diameter concurrently serving as a throttle.
Operation
When main spool (2) is operated, the pump
q
pressure enters port (c) through inlet pore (a)
and is led to the LS circuit.
When the pump pressure rises to reach the
q
load pressure of port (B), check valve (5)
opens.
22
10 Structure, function and maintenance standard
C actuator load
1
BR380JG-1E0