
Alarm valves are designed to activate an alarm via a water motor gong and/or pressure switch during sustained water flow in a wet pipe system, such as when a fire sprinkler operates. HD Alarm Valves are UL Listed and FM Approved. They are available with trims including a retard chamber and water motor alarm gong. For detailed approval information, technical specifications, construction, operating principles, and ordering details, please refer to the product catalogue.