Hydraulic accumulator is an accessory of a hydraulic system. A hydraulic accumulator is a pressure storage reservoir in which a non-compressible hydraulic fluid is held under pressure by an external source. The external source can be a spring, a raised weight, or a compressed gas. An accumulator enables a hydraulic system to cope with extremes of demand using a less powerful pump, to respond more quickly to a temporary demand, and to smooth out pulsations. It is a type of energy storage device.

1. ACCUMULATORS
1Maintainer
Mohammad Azam Khan
M. Tech.
Industrial & Production

2. ACCUMULATOR
2Maintainer Mohammad Azam Khan
• Hydraulic accumulator is an accessoryof a hydraulic system.
• A hydraulic accumulator is a pressure storage reservoir in which a
non-compressible hydraulic fluid is held under pressure by an
external source.
• The external source can be a spring, a raisedweight, or a compressed
gas. An accumulator enables a hydraulic system to cope with
extremes of demand using a less powerful pump, to respond more
quickly to a temporarydemand, and to smooth out pulsations.It is a
type of energy storage device.

3. TYPES OF HYDRAULIC
ACCUMULATOR
3Maintainer Mohammad Azam Khan
• The function of hydraulic accumulator is to store pressurizedoil.
• Types:
– Weighted accumulator
– Spring loaded accumulator
– Gas-charged accumulator

4. WEIGHT LOADED
ACCUMULATOR
4Maintainer Mohammad Azam Khan
• This is the oldest type of accumulator.This consist of a vertical,
heavy steel cylinder which incorporates a piston with packing to
prevent leakage.
• A dead weight is attachedto the top of the piston.
• The force of gravityof the dead weight provides the potential energy
in the accumulator.
• The main disadvantages of this of accumulator is its large size
and heavy weight makes it unsuitable for mobile equipment.

5. WEIGHT LOADED
ACCUMULATOR
5Maintainer Mohammad Azam Khan
The weight-loaded type is historically the oldest type of accumulator.
It consists of a vertical heavy wall steel cylinder, which incorporates a
piston with packing to prevent leakage (Figure 7.14). A dead weight is
attached to the top of the piston.

6. SPRING LOADED
ACCUMULATOR
6
• A spring loaded accumulator is
similar to the weight loaded
type, except that the piston is
preloaded with a spring.
Maintainer Mohammad Azam Khan

7. TYPES
7
• The three types of gas- charged accumulators are bladder, piston and
diaphragm.
Maintainer Mohammad Azam Khan

8. DIAPRAGM TYPE
8Maintainer Mohammad Azam Khan

9. BLADDER TYPE
9Maintainer Mohammad Azam Khan
• The most popular of these is
the bladder type. Bladder
accumulators feature fast
response (less than 25
milliseconds), a maximum gas
compression ratio of around
4:1 and a maximum flow rate
of 15 liters (4 gallons) per
second.

10. ACCUMULATOR
10Maintainer Mohammad Azam Khan