The document describes a hydraulic accumulator which consists of a fixed vertical ram with a central liquid passage surrounded by brass brushes. An outer sliding cylinder has a circular collar to place loads on. Liquid enters through the ram and causes the loaded cylinder to rise, storing hydraulic energy. When the loaded cylinder moves down, accumulated liquid is pushed out through the exit pipe providing energy for applications. Key parameters to consider for accumulators include type, volume, pressure ratings, flow rates and response times.

1. It consists of a fixed vertical ram inside
which is provided a central liquid passage
of small diameter.
This fixed cylinder ram is surrounded by a
closely fitted brass brushes.
Outermost layer is an inverted sliding
cylinder having a circular projected collar
on which loads are placed.
Inlet and Outlet pumps.

2.  The passage for liquid to enter and leave
the unit are provided with the fixed ram
which is connected to the inlet and outlet
pipes.
 Pump is a hydraulic device used to convert
the input mechanical energy into hydraulic
energy.
 The liquid supplied from the pump enters
the cylinder through the central vertical
hole provided in the fixed ram.

3.  This hydraulic energy causes the loaded
cylinder to move upwards and this motion
happens until it is balanced by the weight of
the load.
 And once equibrilium is attained the energy is
stored in this system of differential hydraulic
accumulator and it acts a source of energy for
various purposes like lifting machines etc.
 During the downward motion of the loaded ram
the liquid accumulated is pushed to the exit
pipe and this source of energy is used for the
applications.

4.  Energy storage device.
 Absorb pulsation.
 Cushions operational shocks.
 Pressure maintaining device.
 Dispenser.

5.  Clamping device the hold the work piece with the
devices like jaws vices.
 Mining machinery and equipment.
 Standby power source in industries.
 Automobile industry:
 Suspensions in vehicle.
 ABS Brakes.
 Power steering.
 Agricultural machinery and equipment.
 Forestry equipment.
 Surge reduction circuit.

6. The following are few parameters
which are to be considered during
selection of the differential hydraulic
accumulator based on application
purpose.
Accumulator type.
Accumulator volume.
Nominal hydraulic system pressure.

7.  Pre-charge pressure.
 Required flow rate.
 Fluid type.
 Output volume capacity.
 Response time.