What design feature does a waterflow alarm valve typically utilize?

A waterflow alarm valve typically utilizes a check valve that lifts on water flow. This feature is integral to the operation of the alarm system, as it allows for the detection of water movement within the system. When water flows through the pipe, it applies pressure to the valve, causing it to lift. This lifting action activates the alarm, indicating that there is water movement, which is crucial in sprinkler systems for promptly notifying individuals of potential sprinkler system activation or water flow due to a leak or fire.

The check valve's role is particularly important because it ensures that the system can differentiate between normal water flow during system operation and potentially harmful situations. This mechanism is essential for maintaining safety and responsiveness in fire protection systems, allowing for timely intervention when needed.