Komatsu Galeo PC138US-8 Shop Manual page 133

10 Structure, function and maintenance standard
Shuttle valve
PA1: Discharge pressure of main pump
PA2: Discharge pressure of main pump
PP2: Output pressure of shuttle valve
1. Poppet valve
2. Poppet valve
3. Pin
Function
The shuttle valve selects and outputs the lower
q
discharge pressure of the 2 main pumps.
PC138US, USLC-8
Operation
The discharge pressures (PA1) and (PA2) of
q
the 2 main pumps are applied to poppet valves
(1) and (2) respectively.
Since poppet valves (1) and (2) push each
q
other through pin (3), either one of them
receiving higher pressure is closed and the
other one receiving lower pressure is opened.
Accordingly, lower discharge pressure of the 2
q
main pumps is output.
SEN02548-01
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