What device is typically used to maintain proper tension on the treadway belt in belted walkways?

A tensioning device is specifically designed to ensure that the treadway belt in belted walkways maintains the proper level of tension for efficient operation. The correct tension on the belt is crucial to prevent slippage, reduce wear, and ensure smooth functionality. Tensioning devices can include various mechanisms such as springs, weights, or adjustable pulleys that allow for the fine-tuning of the belt's tightness as it stretches over time due to use.

In contrast, while hydraulic pumps or pneumatic actuators may be used in various applications to generate force or motion, they are not primarily intended for tensioning belts. A brake system is used to control or stop movement but does not address the stability or tension of the belt itself. Therefore, the use of a tensioning device is specifically tailored to maintaining the correct tension in belted walkways, making it the ideal answer to the question.