Acumuladores de diafragma


Fluids are practically incompressible and cannot therefore store pressure energy.

The compressibility of a gas is utilised in hydraulic accumulators for storing fluids. HYDAC diaphragm accumulators are based on this principle, using nitrogen as the compressible medium.

A diaphragm accumulator consists of a fluid section and a gas section with the diaphragm acting as the gas-proof screen.

The fluid section is connected to the hydraulic circuit so that the diaphragm accumulator draws in fluid when the pressure increases and the gas is compressed. When the pressure drops, the compressed gas expands and forces the stored fluid into the circuit. At the base of the diaphragm is valve poppet. This shuts off the hydraulic outlet when the accumulator is completely empty and thus prevents damage to the diaphragm.


HYDAC diaphragm accumulators are available in two versions.

This consists of:

  • Welded pressure vessel, rechargeable on the gas side or, alternatively, completely sealed. Fluid connection available in various types.
  • Flexible diaphragm to separate the fluid and gas sections.
  • Valve poppet set into the base of thediaphragm

This consists of:

  • Forged upper section with gas charging connection.
  • Forged lower section with fluid connection.
  • Exchangeable flexible diaphragm to separate the gas and fluid.
  • Vulcanized valve poppet set into the base of the diaphragm.
  • Lock nut to hold the upper and lower sections of the accumulator together.