Barberi® motorizable bivalent mixing valves allow the mixing between two fluids (e.g. hot and cold water) to get the desired temperature. The mixing is obtained by using three inlets and one common outlet. They are used in heating and cooling systems, central heating systems, heat generators (wall-mounted boilers, solid fuel generators, heat pumps), systems with stratification buffer storages. The mixing is obtained through a shaped rotor that regulates the passage of the fluids. They can also be used as diverting valves or to increase the return temperature to the generator as anti-condensation devices (in solid fuel or diesel generators).