DRS Pressure control with load sensing:
The load sensing control is a flow control option that operates
as a function of the load pressure to regulate the pump dis-
placement to match the actuator flow requirement.
The flow depends here on the cross section of the external
sensing orifice (1) fitted between the pump outlet and the
actuator. The flow is independent of the load pressure below
the pressure cut-off setting and within the control range of the
pump.
The sensing orifice is usually a separately arranged load
sensing directional valve (control block). The position of the
directional valve piston determines the opening cross section
of the sensing orifice and thus the flow of the pump.
The load sensing control compares pressure before and after
the sensing orifice and maintains the pressure drop across
the orifice (differential pressure Δp) and with it the pump flow
constant.
If the differential pressure Δp increases at the sensing orifice,
the pump is swivelled back (towards Vg min), and, if the differen
tial pressure Δp decreases, the pump is swivelled out (towards
Vg max) until the pressure drop across the sensing orifice in the
valve is restored.
Δporifice = ppump – pactuator
The setting range for Δp is between *4 bar and *5 bar.
The standard differential pressure setting is *8 bar. (Please
state in clear text when ordering).
The stand-by pressure in zero stroke operation (sensing orifice
plugged) is slightly above the Δp setting.

Features
Variable axial piston pump of swashplate design for hydrosta-
tic drives in open circuit hydraulic system.
Designed primarily for use in mobile applications.
The pump operates under self-priming conditions, with tank
pressurization, or with an optional built-in charge pump
(impeller).
A comprehensive range of control options is available
matching any application requirement.
Power control option is externally adjustable, even when the
pump is running.
The through drive is suitable for adding gear pumps and axial
piston pumps up to the same, i.e. **0% through drive.
The output flow is proportional to the drive speed and
infinitely variable between qV max and qV min = 0.

DRS Pressure control with load sensing:
The load sensing control is a flow control option that operates
as a function of the load pressure to regulate the pump dis-
placement to match the actuator flow requirement.
The flow depends here on the cross section of the external
sensing orifice (1) fitted between the pump outlet and the
actuator. The flow is independent of the load pressure below
the pressure cut-off setting and within the control range of the
pump.