An independent speed control circuit may be needed with a double-acting cylinder because equal extend and retract times are needed.

• A. Times
• B. Distances
• C. Pressures
• D. Temperatures

Answer: (A)

The key idea is matching how long the cylinder takes to move in each direction. With a double-acting cylinder, the piston must extend and retract in roughly the same amount of time to keep the whole system in sync. Even though the stroke length on both sides is the same, the resistance and flow requirements can be different—for example, the rod side has less area on that side of the piston, and loads or gravity can slow one direction more than the other. An independent speed control circuit lets you set the extend and retract speeds separately, so you can tune them until the extend and retract times match. This keeps cycles predictable and coordinated with other machinery.

Distances are determined by the cylinder’s stroke, not by speed, so adjusting speed won’t change the travel distance. Pressures can affect speed but aren’t the mechanism for achieving equal times in each direction, and temperatures don’t control the actuation timing.