Accumulators store hydraulic energy and make it available on demand to hydraulic systems. They are suitable for hydraulic shock suppression, eliminating pressure ripple, fluid make up in closed circuits, leakage compensation, and providing emergency power during power failures or for holding high pressure without the pump running. Accumulators are often used for flow compensation to meet additional hydraulic demands beyond the pump output, maintaining specific pressures during machine cycles, compensating for energy losses due to leakage or pressure drops, and suppressing shocks in high pressure systems. The type of accumulator chosen depends on factors like mounting position, temperature requirements, and failure risk.

1. SUDHIR REDDY
(09311D0412)

2. INRODUCTION:-
The main function of accumulators is to store hydraulic
energy & on demand make the energy available again to
the system. An accumulators is suitable for:-
Hydraulic shock suppression & eliminating pressure
ripple.
Fluid make up in a closed hydraulic circuit.
Leakage compensation.
Source of emergency power in the case of power failure.
 Holding high pressure for long periods without keeping
the pump running

3. ACCUMLATORS IN A CIRCUIT:-
A hydraulic system consisting of a pump, an electric
power, an electric motor, valves & actuators, as a hydraulic
power is generated is immediately used or converted to
heat. few important cases where accumulators are very
often used by designers,
1.Flow Compensation.
2.Maintaining Pressure.
3.Leakage Compensation
4.Shock Suppression.
5.Application in Press Circuit.

4. 1.Flow compensation:
Fluid energy stored in accumulator is made of to
compensate additional requirement of a hydraulic circuit if
system demand is higher than the pump output.
2.Maintaining Pressure:
During the cycle of operation, a machine may
experience a phase when it needs additional fluid to
maintain certain specific load.

5. 3.Leakage Compensation:
Stored energy of the accumulator can be
easily used to make positive loss of energy due to leakage
or due to drop in pressure.
4. Shock Suppression:
Accumulators are used to suppress shock in a
hydraulic circuit. Hydraulic shock in a circuit, specially
in a high pressure system, may cause undesirable damage
to the system. Shock may arise due to sudden stoppage of
high velocity oil .

6. 5.Application in Press Circuit:
Accumulators are very often used in
hydraulic circuit for forming tools used in hydraulic
circuits for forming tools & other pressure.

7. Important Points To Note Regarding
Accumulator Selection:
•Piston type accumulators do not react as quickly as a
diaphragm or bladder type accumulator , but they can be
mounted in any position , adapted for high temperature
applications and catastrophic failure is mostly uncommon.
•Diaphragm type accumulator are commonly found in the
aircraft industry.
•Bladder type accumulator have to be mounted vertically.
•An inert gas like dry nitrogen is used. Compressed air is
never used because of danger of exploding