Bladder Accumulators

energy storage
emergency operation
force equilibrium
leakage compensation
volume compensation
shock absorbtion
vehicle suspension
pulsation dampening

Bladder Accumulator Stand
for industrial application

Fluids are practically incompressible and cannot therefore store pressure energy.

The compressibility of a gas (nitrogen) is utilized in hydro-pneumatic accumulators for storing fluids. HYDAC bladder accumulators are designed on this principle, using nitrogen as the compressible medium.

The bladder accumulator consists of a fluid section and a gas section, with the bladder acting as a gas-proof screen. The fluid around the bladder is connected with the hydraulic circuit, so that the bladder accumulator draws in fluid when the pressure increases thus compressing the gas. When the pressure drops, the compressed gas expands and forces the stored fluid into the circuit.

HYDAC bladder accumulators consist of a welded or forged pressure vessel (shell), a bladder and ports for gas and fluid inlet. The gas and fluid sides are separated by the bladder.

Corrosion Protection
HYDAC offers internal and/or external protective coatings. If this is insufficient, stainless steel is also available.


Click here to find out more info on gas valve safety.


Bladder Materials
Not all fluids are compatible with every elastomer at all temperatures. HYDAC offers the foilowing choice of elastomers:
NBR (standard nitrile)
LT-NBR (low temperature nitrile)
ECO (epichlorohydrin)
IIR (butyl)
EPR (ethylene propylene)
FPM (fluorelastomer)

Download Bladder Pages (274 K)

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