A10VG Hydraulic Closed circuit pumps , Rexroth Axial piston variable High pressure pump

Control device

HD – Proportional control, hydraulic, pilot-pressure related
The output flow of the pump is infinitely variable between 0 and 100%, proportional to the difference in pilot pressure applied to the two pilot signal ports (Y1 and Y2).
The pilot signal, coming from an external source, is a pressure signal. Flow is negligible, as the pilot signal acts only on the control spool of the control valve.
This control spool then directs control oil into and out of the stroking cylinder to adjust pump displacement as required.
A feedback lever connected to the stroking piston maintains the pump flow for any given pilot signal within the control range.
If the pump is also equipped with a DA control valve (see page 14), automotive operation is possible for travel drives.

HW – Proportional control, hydraulic, mechanical servo
The output flow of the pump is infinitely variable between 0 and 100%, proportional to the swivel angle of the control lever.
A feedback lever connected to the stroking piston maintains the pump flow for any given position of the control lever.
If the pump is also equipped with a DA control valve (see page 14), automotive operation is possible for travel drives.

Technical data

Medium pressure pump for closed-circuit applications.

Size 18 … 63.

Nominal pressure 300 bar.

Maximum pressure 350 bar.

Closed circuit.

Features

Integrated boost pump for boost and pilot oil supply.

Flow direction changes when the swashplate is moved through the neutral position.

High-pressure relief valves with integrated boost function.

Boost-pressure relief valve.

Optional with pressure cut-off.

Large variety of controls.

Swashplate design.