What is the function of a backflow preventer in a fire protection system?

The function of a backflow preventer in a fire protection system is to prevent contaminated water from entering the potable water supply. This device ensures that water flows in one direction only, which is critical for maintaining the safety and quality of drinking water. In the context of a fire protection system, the backflow preventer acts as a safeguard to protect the public water supply from any potentially hazardous materials that could be present in the water used for firefighting. By stopping backflow, it ensures that the system can operate effectively without risking contamination of the water supply.