Products:Accumulators: Diaphragm Type

Diaphragm Accumulators

machine tools
mobile equipment
off-road equipment

Diaphragm Accumulator Stand
for industrial application

HYDAC diaphragm accumulators utilize the compressibility of a gas (nitrogen) in storing hydraulic energy. The gas is required
because fluids are practically incompressible and thus, can not store energy by themselves. The diaphragm is utilized to separate the gas and fluid sides of the accumulator.
The diaphragm accumulators functions by drawing in fluid from the hydraulic circuit when the pressure increases and thus, compresses the gas. It returns this energy to the circuit as the pressure decreases by the expansion of the gas.
A poppet is incorporated into the diaphragm to prevent its extrusion through the fluid port.
HYDAC manufactures two types of diaphragm accumulators:
• welded (non-repairable)
• threaded (repairable)
These have been successfully applied to both industrial and mobile applications in energy storage, maintaining pressure, leakage compensation and vehicle hydraulic systems (e.g. brake and suspension).

Welded consists of:
an electronic beam welded shell with gas charging valve or alternately, completely sealed. Fluid ports are available in various thread configurations.
a flexible diaphragm to separate the gas and fluid sides.
a poppet
Threaded consists of:
a forged upper section with the gas valve.
a forged lower section with the fluid port.
a locking ring to fasten the upper and lower sections together.
a replaceable, flexible diaphragm to separate the gas and fluid sides.
a poppet

Mounting Position
Diaphragm accumulators by design may be mounted in any position. In systems where contamination is a problem, we recommend a vertical mount with fluid port oriented downward.

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

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

System Mounting
HYDAC diaphragm accumulators are designed to be screwed directly into the system. We also recommend the use of our mounting components to minimize the risk of failure due to system vibrations.

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