Abstract: A liquid proportioning system is disclosed which operates to mix a liquid concentrate and a liquid diluent in predetermined ratios. The system includes an automatic valve to terminate the flow of concentrate in the event that an insufficient supply of diluent exists. In addition, an anti-siphoning system is disclosed for creating an anti-siphoning air bubble at the upper end of the diluent reservoir and for insuring that such air bubble is not lost in the event of leakage around the filler cap.

Abstract: A liquid proportioner is disclosed which is particularly adapted for mixing medicaments or the like in the drinking water supplied to animals. The proportioner provides two separated chambers one of which contains medicament and the other which contains water. An orifice system connects each chamber to a mixing chamber. The first orifice system includes a plurality of parallel connected orifices connecting the water chamber and the mixing chamber. The second system includes a plurality of series connected orifices connecting the medicament chamber and the mixing chamber. The two liquids are maintained at substantially the same pressure. In the illustrated embodiment all of the orifices are the same size and the series connected orifice system has a hydrodynamic flow value which is substantially smaller than the hydrodynamic flow value of each of the parallel connected orifices.