Komatsu Galeo BR380JG-1E0 Shop Manual page 122

SEN01352-00
Function
This valve reduces the discharge pressure of
q
the main pump and supplies it as the control
pressure for the solenoid valve and PPC valve.
Operation
1. When engine is stopped.
Poppet (5) is pushed against the seat by spring
q
(6), and the passage from port (PR) o (T) is
closed.
Valve (8) is pushed to the left by spring (7), and
q
the passage from port (P1) o (PR) is open.
Valve (2) is pushed to the left by spring (3), so
q
the passage between port (P1) o (P2) is
closed. (See Fig. 1)
12
10 Structure, function and maintenance standard
BR380JG-1E0