Mixing valve for a domestic water supply system supplying water at medium temperature and having an additional water heater

摘要

The mixture control device is connected to a warm water installation having relatively low supply temperature and including an outlet conduit of the warm water, a parallel outlet conduit of the warm water connected in series with an electrical flow heater and a supply conduit of cold water. A mixture control device has a housing defining a mixing chamber and having three inlets and and outlet. The inlets are connected respectively, to the hot water conduit, the warm water conduit and the cold water conduit. Control means including two superimposed ceramic disks are arranged between the inlet ports and the mixing chamber. One of the disks is stationary and is provided with three inlet bore holes arranged on a concentric circle and communicating with respective inlets. The other control disk is rotatable and is provided with control bore holes arranged on a similar concentric circle in such a manner as to selectively establish a communication of the hot water inlet and of the warm water inlet with the chamber while closing the cold water inlet and in a second control range to establish a communication of the warm water inlet and of the cold water inlet with the chamber while closing the hot water inlet.