10-17
3.1. OPERATING PRINCIPLE
Controls the angle of the pump swash plate
·
The swash plate angle (and thus the pump delivery) is controlled in such a way that the pressure difference
D
PLS
between the pump delivery pressure
PP
and the pressure
PLS
at the work port of the directional control valve is
maintained at a constant value. (
D
PLS
= Pump delivery pressure
PP
--
PLS
delivery pressure to actuator).
·
If the pressure difference
D
PLS
decreases relative to the pressure setting of the
LS
valve, the swash plate angle
will increase.
If the pressure difference
D
PLS
increases, the swash plate angle will decrease.
★
For more detailed information on this mechanism, see the description of the «HYDRAULIC PUMP».
Control valve
Pump delivery
Control piston
TP Valve
LS Valve
PP
PLS
T
D0000631
LOAD SENSING VALVE, PRESSURE CONTROL VALVE
