Where is the clapper valve found in a sprinkler system?

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The clapper valve is the internal part of an alarm check valve in a sprinkler system. It acts as a one-way gate: when no water is flowing, the clapper sits on its seat to prevent backflow toward the water supply. When a sprinkler head is opened and water starts moving through the system, pressure dynamics lift the clapper off its seat, allowing water to flow into the system and triggering the alarm system to indicate that water has released. This arrangement specifically ties the clapper to the alarm-check valve assembly, rather than to components like the retard chamber (which provides a delay, not the valve itself), an alarm test valve (used for testing), or an alarm shutoff valve (used to isolate the alarm).