Indicating valves must close within what timeframe?

Indicating valves must close within what timeframe?

• A. Valves must close in under 30 seconds.
• B. Valves must close in under 10 seconds.
• C. Indicating valves must close in under 5 seconds.
• D. Valves closing time is not specified.

Answer: (C)

Indicating valves are designed to shut off water flow quickly and clearly show the valve’s position. For low-rise residential systems, it’s important to isolate the system fast to minimize water damage and keep the rest of the system functioning. NFPA 13R requires indicating valves to close within 5 seconds after actuation, so the water is stopped promptly and the valve’s closed state is confirmed by the indicator. The other timeframes aren’t consistent with that requirement: 30 seconds is too slow for rapid isolation, 10 seconds isn’t the specified limit, and saying the closing time isn’t specified contradicts the standard. So, the correct timeframe is under 5 seconds.

Indicating valves are designed to shut off water flow quickly and clearly show the valve’s position. For low-rise residential systems, it’s important to isolate the system fast to minimize water damage and keep the rest of the system functioning. NFPA 13R requires indicating valves to close within 5 seconds after actuation, so the water is stopped promptly and the valve’s closed state is confirmed by the indicator. The other timeframes aren’t consistent with that requirement: 30 seconds is too slow for rapid isolation, 10 seconds isn’t the specified limit, and saying the closing time isn’t specified contradicts the standard. So, the correct timeframe is under 5 seconds.