Why might an independent speed control circuit be required with a double-acting cylinder?

• A. To increase the force available from the cylinder
• B. To simplify control logic
• C. Identical extend and retract speeds are needed
• D. To reduce the size of the cylinder

Answer: (C)

Independent speed control is used when the two directions of a double-acting cylinder need to move at the same rate or be tuned to specific speeds. In pneumatic systems, extending and retracting often face different resistance, loads, or friction—plus the exhaust paths can differ. By meter­ing the air flow on each direction separately, you can set equal velocities for both strokes and achieve smooth, synchronized motion. This is especially important for cyclical or coordinated operations where timing matters.

In practice, this means adding flow control in each line (one for extend, one for retract) or using a dedicated speed-control circuit that can regulate the forward and backward speeds independently. This control affects velocity, not force, and it doesn't change the cylinder size; it simply shapes how fast air moves in each direction.