Working principle of hydraulic accumulator

What is hydraulic accumulator?What is working principle of hydraulic accumulator?Use of hydraulic accumulator.

Function

It is to store energy and provide back up during system failure . It can be called as capacitance of the system.

Accumulator is a fluid chamber in which the fluid is stored against dynamic force.This fluid is used when system failed or there is fluid leakage.

The dynamic force may be by spring,compressed gas,weight.

Hydro pneumatic.
- Gas charged
  - No separator type
  - Diaphragm or bladder type
- Piston accumulator
Spring loaded.
Dead weight type.

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