What feature do push-pull handles offer when controlling pump valves?

Push-pull handles are designed to provide a straightforward and effective way to operate pump valves, particularly in a firefighting context. One notable feature of these handles is their ability to lock into place, which ensures that the valve remains open during operation without requiring continuous manual pressure. This locking mechanism is essential for maintaining consistent control over line pressure, allowing the operator to manage water flow efficiently and effectively.

By being able to control line pressure while the handle is locked, firefighters can focus on other vital tasks without the distraction of holding the valve open or adjusting flow. This capability enhances operational safety and effectiveness, especially in high-pressure scenarios. Hence, locking into place while controlling line pressure is a fundamental aspect of how push-pull handles function in controlling pump valves.