Which best describes the interplay between the pump and the accumulator in driving cylinder speed?

Which best describes the interplay between the pump and the accumulator in driving cylinder speed?

• A. The pump supplies oil, and the accumulator provides additional oil to accelerate movement.
• B. The accumulator replaces the pump during operation.
• C. The pump and accumulator slow each other causing slower movement.
• D. The accumulator only serves to regulate pressure, not flow.

Answer: (C)

The speed of a hydraulic cylinder is driven by the instantaneous flow into the cylinder. The pump supplies a baseline flow to move the cylinder at a controlled rate. The accumulator is charged to the system pressure and can release extra oil quickly when there is a demand for faster movement. This additional flow from the accumulator boosts the cylinder speed during acceleration or peak demand, while the pump continues to provide the steady flow when the movement is not accelerating. In short, the accumulator doesn’t replace the pump and doesn’t slow things down; it acts as a reserve that can temporarily increase flow to speed up motion when needed.