Mixing valve

A heating installation or cooling installation mixing device comprising:

• a valve housing comprising a first connection, a second connection and a third connection and defining a first flow path from the first connection to the second connection and defining a second flow path from the first connection to the third connection;
• a movable valve element arranged in an inside of the valve housing in communication with the two flow paths, said valve element being configured and arranged such that a ratio of cross sections of the two flow paths to one another can be varied by way of displacing the valve element;
• a drive for moving the valve element, the drive being arranged on the valve housing, the drive comprising an internal control device for movement control of the drive, the internal control device comprises a first communication interface for communication with an external control device and comprising a corresponding second communication interface;
• and
• at least one internal sensor arranged in or on the valve housing, the at least one sensor being connected to the first communication interface for transmitting a sensor signal to the external control device.