Which valve prevents backflow of water from the sprinkler system and initiates an alarm when water flows?

Which valve prevents backflow of water from the sprinkler system and initiates an alarm when water flows?

• A. Deluge Valve
• B. Alarm Check Valve
• C. Ball Valve
• D. Check Valve

Answer: (B)

An Alarm Check Valve is designed to do two things at once: prevent water from flowing backward into the supply and trigger a flow alarm when water moves through the valve. This dual function matches the question, since it both blocks backflow and initiates an alarm as soon as water starts to flow in the sprinkler system. The other valves don’t provide both features: a deluge valve is tied to deluge systems and isn’t about backflow signaling; a ball valve is just a shutoff with no backflow protection or alarm; a standard check valve stops backward flow but has no alarm.

An Alarm Check Valve is designed to do two things at once: prevent water from flowing backward into the supply and trigger a flow alarm when water moves through the valve. This dual function matches the question, since it both blocks backflow and initiates an alarm as soon as water starts to flow in the sprinkler system. The other valves don’t provide both features: a deluge valve is tied to deluge systems and isn’t about backflow signaling; a ball valve is just a shutoff with no backflow protection or alarm; a standard check valve stops backward flow but has no alarm.