What is a "check valve" and its importance in sprinkler systems?

A check valve is a critical component in sprinkler systems, specifically designed to prevent backflow. Backflow can occur when there is a change in pressure in the system that may cause water to flow in the opposite direction, potentially contaminating the water supply or compromising the effectiveness of the sprinkler system. The check valve ensures that water can only flow in one direction, thereby protecting the integrity of the water supply and maintaining consistent water delivery to the sprinkler heads when activated.

This function is vital not just for operational efficiency but also for safety, as it helps avoid the risks associated with contaminated water entering drinking water systems. Proper installation and maintenance of check valves ensure that sprinkler systems work effectively during a fire event and prevent unwanted backflow under normal operating conditions.