Fire Alarm Check Valve is an essential component of fire protection systems used in buildings, facilities, and industrial settings. It is designed to prevent backflow of water from the fire sprinkler system into the main water supply, ensuring that the fire sprinkler system remains pressurized and ready to respond to a fire emergency. Fire Alarm Check Valve is typically installed in the main water supply line that feeds the fire sprinkler system. It is installed downstream of the water flow alarm switch, which is triggered when water starts flowing through the sprinkler system due to a fire event.