Komatsu Galeo PC138US-8 Shop Manual page 132

SEN02548-01
Check valve
PA1: Discharge pressure of main pump
PA2: Discharge pressure of main pump
PP1: Output pressure of check valve
Function
A set of 2 check valves is used to select and
q
output the higher discharge pressure of the 2
main pumps.
32
10 Structure, function and maintenance standard
1. Poppet valve
2. Poppet valve
Operation
1. When (PA1) > (PA2)
Discharge pressures (PA1) and (PA2) of the
q
main pumps are applied to poppet valves (1)
and (2). Since (PA1) > (PA2), however, poppet
valve (2) is kept closed and (PA1) is output to
(PP1).
2. When (PA1) < (PA2)
Reversely to 1., poppet valve (1) is kept closed
q
and (PA2) is output to (PP1).
PC138US, USLC-8