Komatsu PC88MR-10 Shop Manual page 164

10 Structure and function
Control valve
Travel valve
Operation
When spool (1) is operated, pump discharged pressure (PP) transmitted from notch (a) in the spool of flow
control valve (2) through bridge passage (b) to actuator circuit (A).
Pressure reducing valve (3) is moved to the right by actuator circuit pressure (PA), and notches (c) and (d)
are connected respectively to travel interconnection circuit (e) and LS circuit (PLS).
Actuator circuit pressure (PA) = (A) is sent through notch (c) and internal check valve to notch (d), and
then further sent to LS circuit (PLS).
10-86 PC88MR-10