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Description
The pressure fluctuations occurring in
hydraulic systems can be periodic or single occurrence
problems due to:
•
Flow rate fluctuations from
displacement pumps
•
Actuation of shut-off and
control valves with short opening and closing times
•
Switching pumps on and off
•
Sudden linking of hydraulic
circuits with different pressure levels
Dampeners
have two fluid connections for inline mounting. The volume
of flow is directed straight at the bladder or diaphragm
by diverting it in the fluid valve. This causes direct
contact of the fluid flow with the bladder or diaphragm
which, in an almost inertialess operation, balances the
flow rate fluctuations via the gas volume. It is particularly
effective with higher fre-quency oscillations. The gas
pre-charge pressure is adjusted for the specific systems
operating conditions.
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Construction
HYDAC pulsation dampeners consist of:
•
The welded or forged pressure vessel in carbon steel;
for chemically aggressive fluids they are available
in coated carbon steel or stainless steel
•
The special fluid valve with inline connection, which
guides the flow into the vessels (threaded or flange
connections available)
•
The bladder or diaphragm in various compounds as listed
below
Compound
Materials
Not all fluids are compatible with every elastomer at
all tem-peratures. Therefore, HYDAC offers the following
choice of elastomers:
•
NBR (Standard Nitrile)
•
LT-NBR (Low Temperature Nitrile)
•
ECO (Epichlorohydrin)
•
IIR (Butyl)
•
FPM (Fluorelastomer)
•
others (available upon request)
To determine which material is appropriate... ALWAYS
REFER TO FLUID MANUFACTURER¹S RECOMMENDATION
Corrosion
Protection
For use with certain aggressive
or corrosive fluids, or in a corrosive environment,
HYDAC offers protective coatings and corrosive resistant
materials (i.e. stainless steel) for the accumulator
parts that come in contact with the fluid, or are exposed
to the hostile environment.
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Mounting
Position
The mounting position of hydraulic dampeners is dependent
on the dampener chosen and the specific application. The
preferred position is typically vertical.
System
Mounting
Dampeners should be mounted as close as possible to the
pulsation source.
Applications
Pulsation dampeners are used to:
Reduce vibrations caused by pipes, valves, couplings,
etc. in order to prevent pipe and valve damage
•
Protect measurement instruments and eliminate the impaired
performance caused by pulsations
•
Reduce system noise
•
Increase machine performance
•
Allow the connection of multiple pumps to one line
•
Increase the allowable rpm and feed pressure of pumps
•
Reduce system breakdowns and increase the service life
of the system
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