What is another name for an alarm check valve in fire sprinkler systems?

An alarm check valve is commonly referred to as a clapper in fire sprinkler systems. This terminology reflects the valve's function, which involves a hinged mechanism that closes to prevent water from flowing back into the system and opens to allow water to flow during an alarm condition, thereby alerting to the presence of fire or water flow in the system. The clapper's design ensures that water flows in one direction and that the system remains properly pressurized until a fire event occurs. This is crucial for maintaining the integrity of the fire protection system, ensuring that it operates effectively when needed.

The other options do not accurately describe the same function or component as the alarm check valve. For instance, a separation valve typically refers to a device used to segregate different sections of a water system, while an exit valve suggests the termination point of a system. A pressure valve primarily serves to regulate the pressure within a pipeline and does not function in the same capacity as a clapper style valve in preventing backflow during non-alarm conditions.