What is a primary function of an accumulator in a hydraulic system?

What is a primary function of an accumulator in a hydraulic system?

• A. It serves as a backup supply of hydraulic pressure in the event of a pressure drop
• B. It continuously circulates oil to prevent overheating
• C. It acts as the main pump for the system
• D. It filters impurities from the hydraulic fluid

Answer: (A)

An accumulator stores hydraulic energy as pressurized fluid so it can supply immediate pressure and flow when the system pressure drops or when a sudden demand occurs. It typically uses a gas-charged chamber (bladder or piston) that is precharged to a set pressure. When pressure in the circuit falls or peak demand appears, the stored fluid is released to help maintain system pressure and smooth out flow, reducing pump load and preventing drops that could affect actuators. This backup function is what makes it the best choice. It isn’t meant to continuously circulate oil to prevent overheating (that’s handled by cooling and reservoir systems), it isn’t the main pump, and it doesn’t filter impurities (that’s the job of filters).