What is the purpose of a hydraulic accumulator?

• A. To reduce noise in the system
• B. To act as a reservoir and filter
• C. To cool hydraulic oil
• D. To store hydraulic energy, smooth pressure fluctuations, and supply fluid during pump surges

Answer: (D)

A hydraulic accumulator stores energy in the hydraulic system and smooths pressure by using a gas-charged chamber behind a bladder or piston. When system pressure rises, the gas compresses and stores energy in the fluid. When demand spikes or the pump can’t keep up, the accumulator releases that stored fluid, maintaining pressure, supplying fluid during surges, and dampening pressure fluctuations. This helps reduce pump cycling and protects system components from sudden spikes. It’s not primarily for noise reduction, filtration, or cooling, which are handled by other parts of the system.