The valve installed in a wet pipe sprinkler system's main riser that actuates an alarm when water flows is called what?

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In a wet-pipe sprinkler system, the device on the main riser that both delivers water and activates the fire alarm when a sprinkler head releases water is called the alarm valve. Its purpose is to sense the flow of water and trigger the building’s alarm system while allowing water to reach the rest of the system. Inside and around this valve, the flow of water moves a mechanism that sends a signal to the fire alarm as soon as any head is opened, so alarms go off promptly. This is different from a clapper valve, which is a component used in dry-pipe systems to control air and water, not to actuate the alarm in response to normal sprinkler activation. The term alarm test valve refers to a device used specifically to test the alarm function, not the valve that triggers the alarm during regular operation. The alarm shutoff valve would imply a valve used to stop water flow rather than to trigger the alarm.