Page 8 - Parker - P1/PD series medium duty axial piston pumps

HY28-2665-01/P1/EN Medium Duty Axial Piston Pumps
Technical Information P1/PD Series

Control Option “L”
Load Sensing and Pressure Limiter Control

These controls feature load sensing and maximum the pump load sense control will maintain a constant
pressure compensation. Load sense controls are pressure drop across the main system throttling
used to match pump flow and pressure to system valve, the flow rate will remain constant, independent
demands, thus minimizing losses due to wasted of changes in load pressure and pump shaft speed.
horsepower. The pump automatically adjusts for
changes in drive speed and load pressures to match
the pump output flow to the load requirement. Since

load sensing and pressure limiter control loadsensing and pressure limiter control with minimum displacement stop
4 bar maximum 4 bar maximum

flow flow

pressure pressure

B X
B X

BG
BG

D3
D3
D2
D2
A D1
A D1
Load Sensing and Load Sensing and
Pressure Limiter Control Pressure Limiter Control
with Optional Minimum & Maximum
Displacement Adjustments and
Case-to-Inlet Check Valve
(A minimum displacement stop requires
the use of a system relief valve.)
Refer to page 4 for typical control characteristics.

Parker Hannifin Corporation
Hydraulic Pump Division
6 Marysville, Ohio USA