Komatsu PC20R-8 Shop Manual page 72

2) Pressure compensation control
. Valves (pressure compensation valves) are installed at the inlet port side of the spools of the control valves to
balance the loads.
When the actuators are complex-operated, the pressure differences DP at the upstream (inlet) and downstream
(outlet) are made equal by these valves.
In this way, the flow from the pump are distributed in proportion to the opening areas S1 and S2 of each valve.
∆ P
Pressure
compensation
valve
10-54
Load
Actuator
S1
Pressure
compensation
valve
PUMP
Load
Actuator
∆ P
S2
RKP00681
PC20R-8 PC27R-8