1. What is a Hydraulic
Accumulator?
A hydraulic accumulator stores fluid under pressure
and can serve a number of functions within a
hydraulic system. I´s an item that can provide years
of trouble-free service.
Accumulators can take a specific amount of fluid
under pressure and store it. The fluid is then
released when it´s required to perform a specific
task in the hydraulic system. Accumulators can
provide several functions, such as

2. Why Do You Need It?
• Energy storage
• Compensation of leakage oil
• Compensation of temperature fluctuations
• Emergency operation
• Cushioning of pressure shocks which may
occur at sudden switching of the valves
• Dampening vibrations
• Swell compensator (in marine hydraulics)

3. advantages
• Adding an accumulator to a hydraulic system
offers a number of advantages. In addition, it
results in substantial energy savings and an
increased system lifespan. Applications that
require a lot of power for limited periods of
time can benefit most from the use of
accumulators.

4. • Possibility of smaller pumps
• Lower installed power
• Less heat produced
• Simple maintenance and installation
• Increased service lifetime
• Immediate availability
• Unlimited storage life
• No fatigue
• No inertia

11. Description
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 piston accumulators are
designed on this principle, using nitrogen as the compressible medium.
The piston accumulator consists of a fluid section and a gas section,
with the piston acting as a gas-proof screen. The gas section is
precharged with dry nitrogen gas.
The fluid section is connected to the hydraulic circuit so that the piston
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