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Description
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).
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Construction
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.
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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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