A8VO Axial Piston Variable Double Pump , High pressure pump

Control device

LA0, LA1 - Individual Power Controller

On the variable double pump with individual power controller LA0/LA1, the two rotary groups are not mechanically coupled,
i.e. each rotary group is fitted with a separate power controller.
The power controller controls the displacement of the pump depending on the operating pressure so that a defined input power is not exceeded.
The power setting is adjusted individually for each control and can be different; each pump can be set to 100% input power.
The hyperbolic power characteristic is approximated using two measuring springs. The operating pressure acts on the measuring surfaces of a differential piston against the measuring springs and an externally adjustable spring force, which determines the power setting.
If the sum of the hydraulic forces exceeds the spring forces, control fluid is supplied to the control piston, which swivels the pump back to reduce the flow.
When not under pressure, the pump is swiveled back to its initial position at Vg max by a return spring.

EP Electric Control with Proportional Solenoids

With the electric control with proportional solenoid, the pump displacement is adjusted proportionally and steplessly to the current by means of the magnetic force.
Control from Vg min to Vg max
With increasing control current the pump swivels to a larger displacement.
Initial position without control signal (control current): Vg min
The required control pressure is taken either from the operating pressure or from the externally applied control pressure at port Y3.
To ensure the control even at low operating pressure < 30 bar, the port Y3 must be supplied with an external control pressure of approx. 30 bar.

Technical data

Series 61 / 63.

Sizes 55...200.

Nominal pressure 350 bar.

Peak pressure 400 bar.

for open circuit.

Features

– Variable double pump with two axial tapered piston rotary groups of bent-axis design for hydrostatic drives in open circuits.

– The flow is proportional to the input speed and to the displacement, and is infinitely variable from qV max to qV min = 0.

– The pump is suitable for direct mounting on the flywheel case in diesel engines.

– One common suction port for auxiliary pump and both circuits.

– A wide range of control instruments is available for different control and regulating functions.

– Individual power controller.

– Integrated auxiliary pump with pressure-relief valve, optionally with additional pressure-reduction valve.

– Power take-off for mounting axial piston and gear pumps.

– Excellent power to weight ratio.

– Long service life.