What is a water motor gong and how is it used?

• A. A device that produces a loud sound when water flows through the sprinkler piping, indicating discharge
• B. A bell used for manual alarm only
• C. A valve that releases water automatically when smoke is detected
• D. A sensor that measures heat to activate sprinklers

Answer: (A)

A water motor gong is an audible device powered by the flow of water in the sprinkler piping. When water moves through the system, it drives a small turbine or paddle that powers a hammer to strike a gong, producing a loud signal. This signal confirms that water is actually flowing and discharge is occurring, helping occupants and responders know the system has activated or is being tested. It operates automatically with water flow, unlike a manual alarm bell, a valve that releases water on its own, or a heat-sensing device that triggers sprinklers.