Patent ID: 7740183

Claim:
A thermostatic mixer, comprising one body, which is provided with a feed passage for cold water, a feed passage for warm water, and a discharge passage for mixed water, a slide, which is provided for displacement in axial translation in the body and for narrowing the feed passages for the warm water and for the cold water in opposite directions, thus changing their mixing ratio, an expansion thermocouple, which is connected to the slide for actuating the same and extends in the discharge passage for the mixed water, a spring acting on the thermocouple and the device body, means for adjusting the idle position of the thermocouple, and a rod connecting the thermocouple and the means for adjusting the position of the same, characterized in that on the inside of the slide, in the region of the feed passage for the cold water, an annular feed chamber is formed, in that the mixer additionally comprises a hollow cylinder, which is disposed on the inside of the slide and designed for displacement in axial translation between a first position, in which it narrows the passage between the annular chamber and the space inside the slide and the piston, and a second position, in which the piston does not narrow this passage, in that the mixer comprises a second spring acting between the slide and the piston in such a direction that it acts on the piston toward the first position, in that the piston is provided with limited radial passages penetrating it and located in the region of the annular feed chamber when the piston is in its first position, and in that the piston comprises a transversal wall, which separates the space inside the piston into an intermediate chamber and a discharge chamber and in which an axial limited flow passage is provided, which is penetrated by the rod for connection between the thermocouple and the means for adjusting the position of the same.