Variable Displacement Hydraulic Pumps That Match Flow to Demand
Techknow Engineering Enterprise is a variable displacement pump supplier for plants, OEMs and mobile equipment users across India. We supply variable displacement axial piston pumps and variable vane pumps, with the control that suits your machine cycle.
A variable displacement hydraulic pump changes how much oil it delivers per revolution while it runs. Instead of pumping full flow and dumping the excess over a relief valve, it supplies only what the actuators need. The result is less heat, smaller coolers and lower power consumption. We are an Authorized HYDAC Distributor and also supply pumps from Rexroth, Parker, Yuken and Eaton-Vickers.
Tell us how your machine uses flow and pressure, or send the nameplate of the pump you are replacing, and our team will recommend a suitable pump and control.
How a Variable Displacement Pump Works
Displacement changes with the load, not just with drive speed.
In a fixed pump, flow depends only on drive speed. In a variable displacement hydraulic pump, a control mechanism changes the internal geometry while the pump runs. When the system reaches its set pressure or the actuators slow down, the control reduces displacement so the pump delivers less flow and draws less power.
Piston and Vane Designs
Variable axial piston pumps
The control tilts the swash plate to change piston stroke. A variable displacement axial piston pump handles high pressures — up to 500 bar with 32–1000 lpm, depending on version — in open and closed circuits. View axial piston pumps.
Variable vane pumps
The control shifts the cam ring to change its eccentricity, and therefore the volume between the vanes. Variable vane pumps suit low to medium pressure — up to 160 bar with 37–270 lpm, depending on version — and run quietly. View hydraulic vane pumps.
Control Options for Variable Displacement Pumps
The control defines how the pump responds to the machine.
Pressure-Constant (Compensator)
Holds a set pressure and reduces flow to near zero once the limit is reached — ideal for clamping and holding.
Remote / Variable Pressure
Allows the pressure setting to be changed remotely, so one pump can serve different machine steps.
Load-Sensing Control
Senses the actuator load and supplies only the flow and pressure needed, plus a small margin.
Un-Load Control
Drops pressure and power when the machine is idle, reducing heat during waiting times.
Power / Torque Limiting
Keeps input power within the motor or engine rating, where available on the selected series.
Electronic Control
[TECHKNOW TO CONFIRM: whether electro-proportional pressure/flow control versions are supplied.]
Why Use a Variable Displacement Hydraulic Pump
Fixed pump or variable pump: the difference shows up in heat and power.
With a fixed pump, surplus flow returns to tank through the relief valve at full pressure, and that energy turns into heat. A variable displacement pump avoids most of that loss, which is why it is the usual choice for machines with long holding times or changing demand.
Benefits and Where They Matter Most
Benefits
- Lower power consumption at part load
- Less heat in the oil and smaller cooling requirement
- Stable pressure without constant relief-valve flow
- Longer oil and seal life thanks to lower temperatures
Typical machines
- Injection moulding and plastic machinery
- Hydraulic presses with holding phases
- Machine tools and clamping circuits
- Mobile machinery with load-sensing hydraulics
Pair the pump with suitable oil cooling and return line filtration.
Variable Pump Ranges at a Glance
Typical values for the variable pumps we supply. Exact data depends on the series and version selected.
Axial Piston Pressure
Variable displacement axial piston pumps up to 500 bar, depending on version.
Axial Piston Flow
Flow from 32 to 1000 lpm across the variable axial piston range.
Vane Pressure
Variable displacement vane pumps up to 160 bar, depending on version.
Vane Flow
Flow from 37 to 270 lpm across the variable vane range.
Controls
Un-load, variable pressure, load-sensing and pressure-constant controls.
Circuit Types
Variable axial piston pumps can be used in open and closed circuits.
Industries Using Variable Displacement Pumps
Techknow is a variable displacement pump supplier for energy-sensitive hydraulic systems across steel, power, plastics, process and mobile industries.
Rolling, Pressing & Casting
Turbine Control & Emergency Backup
Turbine Governing & Dam Gates
Pitch Control & Braking Systems
Excavators, Cranes & Earthmovers
Press Shop, Body Shop & Assembly
Steering & Deck Machinery
Pulp Processing & Paper Production
Crushers, Kilns & Material Handling
Injection & Blow Moulding
Pressure Stabilization & Shutdown
Valve Actuation & Pressure Control
Choosing a Variable Displacement Pump Supplier and the Right Pump
Share these details for a correct recommendation or like-for-like replacement.
Selection depends on peak flow, pressure setting, how quickly the flow must change, and the circuit type. A variable displacement pump supplier that reviews the machine cycle, and not just the catalogue size, helps avoid an undersized control or excess heat.
Details We Need
Duty
- Maximum flow, or displacement and drive speed
- Pressure setting and peak pressure
- Open or closed circuit
- Required control and response
- Fluid type and operating temperature
Replacement
- Complete nameplate type code, including the control code
- Mounting flange, shaft and direction of rotation
- Port sizes and positions
- Drive motor kW or engine details
Pump Brands
We Supply Across India
Authorized HYDAC distributor and multi-brand pump supplier for Indian industry
Authorized HYDAC Distributor and Variable Displacement Pump Supplier
Techknow Engineering is an Authorized Distributor for HYDAC in India. We are also a variable displacement pump supplier for Rexroth, Parker, Yuken, Eaton-Vickers, Dowty, Polyhydron and Beiri Hawe, so the pump, filtration and accessories for your system can come from one supplier.
Related Hydraulic Pump Types
Compare variable displacement pumps with the other pump types we supply.
Axial Piston Pumps
Swash-plate and bent-axis pumps, fixed and variable, for high pressure.
Hydraulic Vane Pumps
Fixed and variable vane pumps for quiet medium-pressure circuits.
Hydraulic Piston Pumps
Overview of axial and radial piston pumps, including Rexroth piston pumps.
Radial Piston Pumps
Fixed displacement pumps for very high pressure at small flow.
Hydraulic Gear Pumps
Simple fixed-flow pumps for cost-effective circuits.
Hydraulic Pumps Range
Every pump type and brand we supply in one place.
FAQ'S
A variable displacement pump can change the volume it delivers per revolution while running, so output flow matches what the system needs instead of staying constant.
A fixed pump delivers the same flow at a given speed and sends surplus oil over the relief valve. A variable displacement hydraulic pump reduces its flow as demand falls, which saves power and reduces heat.
We supply variable displacement axial piston pumps (up to 500 bar, 32–1000 lpm) and variable vane pumps (up to 160 bar, 37–270 lpm), depending on version.
It is a control that holds a set pressure. Once that pressure is reached, the pump reduces its displacement to deliver only the small flow needed to maintain it.
Yes. As a variable displacement pump supplier, we can match your existing pump from its complete type code, including the control code, or suggest a suitable alternative if the model is obsolete.
Yes. Because it avoids continuous flow over the relief valve, a variable displacement hydraulic pump typically uses less power and generates less heat at part load than a fixed pump on the same machine.
Looking for a Variable Displacement Pump Supplier?
Send us your nameplate photo, type code or machine cycle and our team will recommend a suitable variable pump and control with a quotation.
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