What happens when the leaving water temperature rises above the set point in a mixing valve?

When the leaving water temperature rises above the set point in a mixing valve, the device responds by throttling back the hot water supply while allowing more cold water to enter the mix. This adjustment helps regulate the temperature of the water being delivered downstream, ensuring it remains within the desired range.

Mixing valves are designed to maintain a specific temperature by mixing hot and cold water; thus, as the temperature exceeds the set point, it's crucial to decrease the influence of the hotter water to prevent scalding and maintain comfort. The goal of the valve's operation is to fine-tune the mixture of hot and cold based on real-time temperature readings, ensuring that the output remains both safe and effective for its intended use.

This operational principle underlines the necessity for accurate temperature control in various systems, as it ultimately enhances safety and efficiency in water delivery systems.