Variable Positive Displacement Pumps

Variable Positive Displacement Pumps are adjustable-displacement hydraulic pumps designed to regulate fluid output according to system requirements. Axial piston configurations are commonly used for high-pressure hydraulic systems requiring variable flow, high power density and controlled operation.

The Variable Positive Displacement Pump supports adjustable output to match different hydraulic operating conditions.

Adjustable Displacement - Changes pump output according to required flow.

Variable-Speed Operation - Supports flow adjustment through changes in pump speed when compatible with the drive system.

Pressure-Based Adjustment - Can be configured for pressure-compensated operation where system pressure varies.

Multiple Control Options - Available with manual, hydraulic, proportional or electronic control depending on model.

Load Adaptation - Adjusts hydraulic output to changing machine loads, reducing unnecessary flow during lower-demand conditions.

Adjustable Displacement
The variable displacement mechanism allows pump output to be changed within the specified displacement range, making the pump suitable for hydraulic systems with changing flow requirements.

High-Pressure Capability
Commercial variable displacement axial piston pumps are available for high-pressure hydraulic applications, with industry models reaching approximately 400–450 bar continuous or nominal pressure and up to 500 bar maximum pressure.

High Flow Capacity
Large-displacement configurations can deliver several hundred litres per minute. Liebherr's DPVG series, for example, reaches up to 709 L/min depending on displacement and operating speed.

High Power Density
Axial piston construction provides high hydraulic output from a relatively compact pump package, making it suitable for mobile machinery and high-power hydraulic systems.

Excavators - Main hydraulic systems for boom, arm, bucket and travel functions.

Wheel Loaders - Hydraulic systems for lifting, steering and auxiliary functions.

Cranes - Boom, winch and slewing hydraulic circuits requiring variable flow.

Agricultural Tractors - Implement, steering and auxiliary hydraulic systems.

Mining Machinery - High-pressure hydraulic circuits for heavy-duty equipment.

Hydraulic Presses - Hydraulic power units requiring variable flow during pressing cycles.

Machine Tools - Hydraulic clamping, positioning and auxiliary systems.

Hydrostatic Drives - Closed-circuit traction and transmission systems.

Hydraulic Power Units - Customized systems requiring adjustable displacement, flow and pressure.

Pump configurations can be adapted to project requirements, subject to technical evaluation.
Available options may include:

Each Variable Positive Displacement Pump is tested against specified operating and dimensional requirements before shipment.

Dimensional Inspection - Verifies critical dimensions, shaft geometry, mounting interfaces and hydraulic ports.

Pressure Testing - Checks pump operation and sealing performance under the specified pressure range.

Leakage Testing - Inspects external and internal leakage of the assembled pump.

Flow Testing - Verifies actual flow output against the specified displacement and operating speed.

Performance Testing - Checks flow, pressure, speed and power under defined operating conditions.

Control Testing - Verifies displacement adjustment and control response for the selected configuration.

Final Inspection - Confirms appearance, assembly, connections, identification and order specifications.

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