Barberi® T-Sunny thermostatic mixing valves are devices with mixed water coming from the central port and are used to adjust the water temperature. They are normally used in domestic water systems or in heating systems served by a thermal solar system through forced or natural circulation. Their function is to maintain constant the temperature of the mixed water sent to users even if hot and cold water inlet temperatures or pressures vary. This series of valves can be equipped with nuts and tailpieces with or without built-in check valve or built-in check valve and filter.