An independent speed control circuit may be needed with a double-acting cylinder because __________.

An independent speed control circuit is particularly important in double-acting cylinders when there is a need for equal extend and retract speeds. This requirement arises because a double-acting cylinder operates by applying pressure on either side of the piston to extend and retract. If the extension and retraction speeds differ, it can affect the performance of the system, leading to issues such as uneven wear, inefficiency, or even mechanical failure.

By integrating an independent speed control circuit, you ensure that the speed at which the cylinder extends is matched by the speed at which it retracts. Maintaining these equal speeds helps provide smoother operation and more precise control over the movement of the load. This is especially critical in applications where precise positioning and timing are important, as any discrepancy in speed could lead to misalignment or damage to machinery.

In contrast, other options might mention aspects such as aiding loads or the need for different pressures, but these relate more to the specific application of the cylinder rather than directly addressing the requirement for controlling extend and retract speeds. Thus, focusing on achieving balance in motion through independent speed control is essential for optimal functionality.