Hydraulic Booster (miniBOOSTER)

miniBOOSTER is a oscillating booster.
They automatically intensify the system pressure giving a higher outlet pressure and will compensate for oil loss on the high pressure side.

  • Max. 20 times Intensification
  • Compact Size & High Performance
  • Space Saving & Cost Reduction
  • Various Models to meet different demand

The increase pressure actuation system of hydraulic boosters HC series


miniBOOSTER are oscillating boosters. They automatically intensify system pressure giving a higher outlet pressure and will compensate for oil loss on the high pressure side. This function of the miniBOOSTER is based on the patented system as shown above.

The basic design incorporates a low-pressure piston (LP), a high-pressure piston (HP) and a bistable reversing valve (BV1). The dump valve (DV) is an optional feature.

Hydraulic fluid at system pressure is supplied to port IN. It flows freely past check valves KV1, KV2 and DV (if included) via port H. At this point all flow goes through the booster, and a cylinder on the high pressure side H will move fast forward. As the cylinder meets resistance pressure increases in the high pressure side H equal to the pump supply pressure. This causes check valves KV1 and DV to close and the oil is directed to Vol 1. The bistable valve BV1 connects Vol 2 to tank via Vol 3. As pump pressure is applied to Vol 1 the pistons move down.

When the piston has fully moved down, Pilot string 1 is energized operating the bistable valve BV1 changing its position. Fluid is led to Vol 2 moving the pistons upward delivering fluid at higher pressure. The resultant pressure is determined by the ratio in area of the low pressure piston LP to the high pressure piston HP. Once the high pressure piston HP has moved up, Pilot string 1 is connected to tank, the bistable valve BV1 returns to its original position and the cycle is repeated until the required end pressure has been established. At that point the intensifier stops and will only start again to maintain the pressure at the high pressure side of H. Pressure can be relieved from the high pressure side through the pilot operated check valve DV (if included). By connecting port R to the supply pressure and port IN to tank, pilot string 3 will be pressurized, allowing the fluid from the high pressure side H to flow back to tank.

General Specifications

Temperature range-40℃ to 120℃
Maximum inlet flowSee performance data for each model
FluidsRecognized hydraulic and transmission fluids compatible with Buna-N seals For other fluids please contact technical sales
Inlet pressureMin. 20 Bar (290 psi), Max. 200 Bar (2.900 psi)
Note: Outlet pressure must never exceed 800 Bar
(11.600 psi), Except for the HC8.
Filtration10 micron nominal; Max. 19/16 according to ISO 4406
ConnectionsSee data for each model.
MaterialsBodies, cast iron, internal components, steel:
External surface, zinc chromate finish;
Static seals, Nitrile; No dynamic seals

As shown on the chart miniBOOSTER has a dual flow/ pressure feature. Initially when fluid is supplied to the booster it flows straight through to the high pressure side. At this point all the supplied flow (up to the max. allowed inlet flow) goes to the actuator allowing it to operate fast in the desired direction. As soon as inlet pressure is reached in the actuator, the flow will then be supplied via the high pressure piston until intensified pressure is reached.

Advantages summarized

  • Gives high pressure whenever needed
  • Expensive high pressure pumps not required
  • Expence saved on tubing
  • Increase expensive high pressure by simply increasing inexpensive low pressure
  • Low pressure is changed into high pressure with hardly any use of energy or heat generation
  • Leakages on the high pressure side compensated dynamically
  • System works with labyrinthine tubing which gives a longer life
  • No rotating parts
  • Light weight
  • Small size – big performance


Outlet pressure barAverage outlet flow (l/min)Inlet pressure (bar)Inlet flow (l/min)ConnectionWeight (kg)RatioModel: SteelModel: Stainless steelCommentsModels
24 – 8000.3 – 0.520 – 2002.0 – 8.0Tube0.71.2 – 7.5HC1  
24 – 8000.3 – 2.520 – 2002.0 – 15.0Tube1.01.2 – 20.0HC2HC2W 
24 – 5000.3 – 2.520 – 2002.0 – 15.0Manifold NG6/DO32.51.2 – 20.0HC3  
24 – 8000.3 – 2.520 – 2002.0 – 15.0Tube3.01.2 – 20.0HC5 Double acting
26 – 8000.7 – 5.520 – 2002.0 – 35.0Tube3.71.3 – 9.8HC4HC4W 
24 – 8000.7 – 11.020 – 2002.0 – 15.0Tube3.81.2 – 20.0HC2D Dual acting
26 – 8001.5 – 11.020 – 2005.0 – 70.0Tube9.51.3 – 8.2HC6  
24 – 80011.2 – 56.020 – 2005.0 – 70.0Tube20.01.2 – 8.2HC6D Dual acting
100 – 20000.3 – 1.620 – 2002.0 – 14.0Tube1.55.0 – 20.0HC7HC7W 
100 – 20000.3 – 1.620 – 2002.0 – 14.0Tube5.05.0 – 20.0HC8HC8W 
220 – 50000.3 – 1.820 – 2005.0 – 20.0Tube9.98.2 – 25.0HC9  
20 – 8006.0 – 41.020 – 2005.0 – 70.0Tube22.01.0 – 10.1HC6D2HC6D2W2 media