A hydraulic accumulator is a device that stores the potential energy of an incompressible fluid held under pressure by an external source against some dynamic force. This dynamic force can come from different sources. The stored potential energy in the accumulator is a quick secondary source of fluid power capable of doing useful work.
There are three basic types of accumulators:
1.Weight-loaded or gravity accumulator (Simple hydraulic accumulator)
2.Spring-loaded accumulator:
3.Gas loaded accumulator.