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Accumulator Charging Units

Accumulator charging units are the flywheels of hydraulic systems. Their task is to temporarily store hydraulic energy. Using an accumulator charging circuit makes particular sense if the energy demand of a hydraulic system varies greatly. A hydraulic accumulator fills during the partial-load or no-load phases of the machine cycle. The energy stored in this way is then once again available during periods of high energy demand. This makes it possible to design the motors and pumps only for the average energy demand.

Accumulator charging units save you money during operation as well. Hydraulic systems achieve a considerably higher energy efficiency when they are used. The average energy consumption drops by up to 50% depending on the type of machine cycle.

Voith accumulator charging units are complete assemblies with components that are optimally matched to one another. Hydraulically controlled switching actions take place especially smoothly and do not cause pressure spikes in the system. Four different sizes are available as standard equipment for different pump flow rates.


Voith GmbH & Co. KGaA
Schuckertstr. 15
71277 Rutesheim, Germany

Tel. +49 7152 992-3
Fax +49 7152 992-400

Technical data

Suitable pump flow rates 10 – 400 l/min
Maximum operating pressure 345 bar
Stepless adjustment ranges for the upper operating pressure switching point 20 – 45, 45 – 80, 80 – 120,
120 – 175, 175 – 250
or 250 – 315 bar
Switching hysteresis 5%, 10%, 15% or 20%

Typical applications

  • Hydraulic systems with greatly varying energy consumption
  • Hydraulic power packs with accumu­lator operation
  • Machine tools

Advantages and benefits

Features Advantages Benefits
  • Temporary storage of hydraulic energy in hydraulic accumulators.
  • The hydraulic system is more energy efficient.
  • Energy consumption drops by up to 50% compared to operation without an accumulator.
  • You reduce your energy costs, which results in a lower total cost of owner­ship (TCO).
  • Motor and pump are designed only for the average energy demand.
  • The procurement costs for the hydraulic system are lower.
  • Standardized accumulator charging circuit with very few components and modular design.
  • This keeps the planning effort asso­ciated with system integration low.
  • A large number of designs and sizes are available.
  • Quick and simple system integration reduces your development times and costs.
  • Commissioning is simple.
  • Commissioning is quick and low-cost.
  • Hydraulic control of the switching operations by a piloted, specially matched pressure control valve.
  • Switching operations are smooth.
  • No pressure spikes occur in the system.
  • All your hydraulic system com­ponents will have a longer service life.
  • Noise emissions are low.
  • Switching operations are highly precise.
  • The force curves for the actuator are very precise and the parts produced are high quality.
  • The switching operations are highly dynamic.
  • A quick cycle design results in high productivity.

Technical information

Hydraulic diagram





Accumulator charging basic block
2 Check valve
3 Pressure-relief valve
4 Accumulator charging valve
5 Pressure gauge
6 Manual accumulator discharging
7 Optional: Electrical accumulator discharging
8 Optional: Pressure switch for system pressure
9 Optional: Accumulator