What does the hydraulic accumulator do?

• A. Maintain a constant pressure in the system by compensating for surges
• B. Increase flow rate
• C. Filter hydraulic fluid
• D. Cool hydraulic fluid

Answer: (A)

Hydraulic accumulators stabilize system pressure by absorbing surges and smoothing out fluctuations. They store energy in a gas-filled chamber (gas pre-charge) separated from the hydraulic fluid by a bladder or piston. When pressure spikes occur, the gasCompresses and stores energy; when demand rises suddenly or pressure would drop, fluid is released from the accumulator to help maintain a steady pressure. This cushioning effect protects components, reduces hammering, and helps keep actuator speed and pump loading more consistent. They’re not primarily used to filter or cool fluid, and while they can supply extra fluid briefly, their main role is keeping pressure stable rather than increasing long-term flow rate.