What is the minimum requirement for testing valve supervisory systems regarding movement indication?

The minimum requirement for testing valve supervisory systems regarding movement indication is the first two revolutions of the valve. This standard ensures that the supervisory system effectively detects the valve's position and confirms that it is fully operational.

When conducting these tests, it is crucial to observe the movement during the initial revolutions because any malfunction or failure to indicate movement at this point might signal an issue with the system. Ensuring that the valve moves as expected during these initial revolutions helps to establish confidence in the monitoring system's reliability, which is vital for the effective operation and safety of fire protection systems.

In the context of inspection, testing, and maintenance, adhering to this requirement contributes to maintaining the integrity of water-based fire protection systems, thereby ensuring that they will function properly in the event of a fire.