What is the maximum closure time for listed indicating valves when operated from the fully open position?

The maximum closure time for listed indicating valves when operated from the fully open position is indeed 5 seconds. This standard is in place to ensure that the valve can close quickly enough to prevent excessive water flow that could cause damage or flooding in the event of a sprinkler system activation. A rapid closure time is crucial to maintain system integrity and to effectively manage water control in emergency situations.

In the context of fire protection and sprinkler systems, quick closure helps limit water damage and facilitates swift emergency response. The specific 5-second guideline reflects industry consensus on how quickly these valves need to respond to maintain safety and operational efficiency.

This requirement highlights the importance of maintaining proper response times in fire suppression systems, which can be critical in saving lives and minimizing property damage.