Komatsu PC200-8M0 Shop Manual page 180

SEN06120-00
When abnormally high pressure is generated
If pressure (PR) of the self-pressure reducing
q
valve becomes abnormally high, ball (16) con-
tracts spring (15) and separates from the seat.
This allows the pressurized oil to flow to drain
q
port (TS) from port (PR), lowering pressure
(PR).
q As a result, components such as PPC valves
and solenoid valves are protected from abnor-
mally high pressure.
38
10-402
402 Hydraulic system, Part 2
Functions and operation by valve
PC200, 200LC, 220, 220LC-8M0