What is a Hydraulic Power Unit?

Hydraulic Power Unit



A Hydraulic Power Unit or HPU for short, in basic terminology, is a self-contained unit that consists primarily of a prime mover (either an engine or electric motor) a hydraulic pump, a valve and a hydraulic tank reservoir.


By utilising fluid to transmit power from one location to another, hydraulic power units can generate large amounts of power, which in turn can be used to drive hydraulic machinery.

Another way to think of a hydraulic power pack is that it is a portable power delivery system that holds energy for a hydraulic mechanism. A good analogy to think what a hydraulic power pack is, is to consider the role of an electric battery, which stores energy for a circuit to draw on when is required. HPU’s are used in a wide range of industrial applications and machines, especially where there is no direct access to a power source.

How is hydraulic power unit required power calculated?

Hydraulic power is defined as flow multiplied by pressure. The hydraulic power supplied by a pump is: Power = (P x Q) ÷ 600 – where power is in kilowatts [kW], P is the pressure in bars, and Q is the flow in litres per minute. ** based upon 100% efficiency; 90% efficiency would equate to 75 ÷ 0.9 = 83.3kW.


Hydraulic Power Unit Manufactures

At Neilson Hydraulics we have been designing, building, installing, and commissioning hydraulic power units for over 30 years. We manufacture custom-made hydraulic power units that can be built strictly in accordance with the client’s specifications. We can provide a complete hydraulic solution from ‘concept to completion’. As a HPU manufacturer, we can provide repeat hydraulic power units, as we well as hydraulic power units for specialist projects. Utilising our string technical abilities in 3D modelling, CAD, SolidWorks, system controls and hydraulic circuit design.


We have used our expertise and knowledge for projects spanning numerous sectors, including, recycling, oil, gas, marine, agricultural and construction to name a few.


Example of Hydraulic Power Units we have produced:


Medium Pressure Range HPU

Hydraulic Power Unit



HPU System Features: 

  • Max Pressures 280 BAR
  • Variable delivery axial piston pump
  • Electric motor or diesel driven
  • Hydraulic Reservoir & Accessories
  • Proportional control valves, solenoid / manual or cetop valves
  • Pressure & return filtration
  • Electrical control panel

A 44kW Diesel Power Pack, with Danfoss K-frame Pump capable of 200 bar working pressure, and 100 lpm working pressure.


Hydraulic Power Unit



Key features include:

  • 300 litre hydraulic tank.
  • Load sensing power unit with online hydraulic cooler.
  • Full bunded frame, fork truck lifting points, lifting eyes complete with load test certificate.
  • Completed with full enclosure, lockable doors and vented panels.



At Neilson Hydraulic we can help you with all your hydraulic requirements and needs. To enquire about our Hydraulic Power Units, please call 01709 821002, email: sales@neilson-hydraulics.co.uk or visit: https://www.neilson-hydraulics.co.uk/hydraulic-power-packs.html


Neilson Hydraulics is an official UK sales partner for Danfoss Hydraulics (Danfoss Power Solutions, Bosch Rexroth Hydraulics, Moveco Rotary Actuators, IMO Slew Drives and IMO Slewing Rings. We also supply Des-Case Breathers, Eaton Internormen Filters, SPX Power Team. The company also designs and manufactures a range of Hydraulic Power Packs and Hydraulic Power Units.

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