Which device stores hydraulic energy and smooths pressure fluctuations?

• A. To store hydraulic energy and smooth out pressure fluctuations.
• B. To filter contaminants from fluid.
• C. To increase system noise.
• D. To regulate temperature.

Answer: (A)

An accumulator stores hydraulic energy and smooths pressure fluctuations. It has a gas-filled chamber separated from the hydraulic fluid by a bladder, diaphragm, or piston. As fluid enters, the gas is compressed, storing energy. When the system pressure would drop or a sudden surge is needed, the stored energy is released to maintain steady pressure and dampen shocks. This keeps actuator speed more consistent and reduces pump cycling. Other devices exist for filtering contaminants or regulating temperature, but they don’t store energy or smooth pressure like an accumulator does.