What is the primary purpose of alarm check valves in a sprinkler system?

The primary purpose of alarm check valves in a sprinkler system is to control water flow during an alarm. These valves are designed to prevent water from flowing through the system until a fire has been detected, thus allowing for the pressure needed to operate the sprinkler heads effectively when needed. When a sprinkler head activates due to heat from a fire, the alarm check valve opens, allowing water to flow to the activated sprinkler, which then helps to suppress the fire.

This mechanism ensures that the water supply is only released when necessary, preventing unnecessary water damage and maintaining the system's integrity. Additionally, by controlling the flow of water, the alarm check valve helps ensure that the alarms can effectively signal the presence of a fire to alert occupants and first responders, aligning with the overall goal of fire safety systems to protect lives and property.