Hydraulic accumulators

Hydraulic accumulators

The fundamental function of hydraulic accumulators is to keep the pressure and flowrate of the oil circulating in the hydraulic system as constant as possible over time, making variations smooth and free from sudden peaks. Because of this important function, accumulators can be used to very briefly replace or complement pumps.

There are three different types:

  • Diaphragm
  • Bladder
  • Piston

In addition to storing energy, these enable dampening of pressure surges in the system, reducing pulsation in hydraulic circuits and preventing cavitation.

If you are looking for a company that handles supply, repair and refurbishment of hydraulic accumulators, do not hesitate to contact us.

Accumulatori-idraulici-oleodinamici-a pistone

Types of accumulators

Diaphragm: diaphragm accumulators have two chambers separated by a downward-facing spherical diaphragm; the gas precharged into the accumulator through a special valve takes up the entire volume of the accumulator.

Bladder: the principle is similar to that of diaphragm accumulators. Oil is drawn in the bottom part reducing the volume available to gas, which is compressed and can return the accumulated volume of oil if pressure drops.

Piston: in piston accumulators, gas and fluid are separated by a floating piston moving inside a cylinder; separation between gas and liquid is ensured by seals.


Choosing the right accumulator

When choosing an accumulator, there are a number of factors to take into account:

The maximum pressure shown in the specifications must never be exceeded and, considering possible temperature increases, working pressure should be around 80% of the accumulator’s maximum operating pressure.

To guarantee optimal accumulator operation, the minimum operating pressure should be approximately 10% greater than the precharge pressure of the accumulator.

The volume of oil available must be analysed for each single case.

Please contact us for additional information on our hydraulic accumulators.