What is a primary function of flush valves in dead-end mains?

Flush valves in dead-end mains serve a critical function in maintaining water quality by removing sediment buildup. Over time, stagnant water in dead-end mains can lead to the accumulation of sediments, rust, and other debris. This sediment can negatively impact water quality by introducing contaminants or creating taste and odor issues.

By using flush valves, operators can periodically flush out this stagnant water and sediment, ensuring that only fresh, clean water is maintained in the distribution system. This process is essential for maintaining water safety and quality standards and helps prevent the growth of bacteria and other harmful microorganisms.

The other functions mentioned, such as controlling flow direction, allowing for sampling, or balancing pressure, are not the primary purpose of flush valves in this specific context. Flush valves are predominantly focused on the removal of sediment and ensuring a clean water supply.