Which option best captures the role of the accumulator in this hydraulic circuit?

Which option best captures the role of the accumulator in this hydraulic circuit?

• A. It supplies additional hydraulic oil to the cylinder when used with the pump.
• B. It stores electric energy to run the pump.
• C. It filters contaminants from the hydraulic fluid.
• D. It converts hydraulic energy to mechanical energy.

Answer: (A)

Accumulators act as an energy reservoir in hydraulic systems. They store hydraulic energy by precharging a gas (or spring) behind the fluid, so when demand spikes or the pump can’t keep up, the stored fluid is released to the cylinder. This extra flow helps maintain cylinder speed and pressure, smooths out pressure fluctuations, and reduces pump cycling, especially during short, high-demand bursts. That’s why the option describing supplying additional hydraulic oil to the cylinder when used with the pump matches what an accumulator does.

The other ideas aren’t what an accumulator does: storing electric energy would be the role of a battery or capacitor, filtering contaminants is the job of a filter, and converting hydraulic energy to mechanical energy is done by a motor or hydraulic actuator, not the accumulator.