Method and tank for dispensing liquid substances into containers

A method of dispensing liquid substances into containers, each container having a filler mouth, said method comprising:

• advancing containers in ordered succession along a first predetermined path toward a first transfer station;
• transferring the containers intermittently in ordered succession to a carousel, rotatable about a main axis, and supporting a tank that affords a fluid-tight enclosure and is equipped with a plurality of filler valves uniformly distributed about the axis of rotation;
• directing a liquid substance into the tank and filling the tank sufficiently to establish a predetermined head between the free surface of the liquid substance and the filler valves;
• setting the carousel and the tank in rotation about the axis in such a way that each filler valve is positioned in alignment with and over the mouth of a relative container and directed thus together with the container around a second predetermined path along which the containers are filled;
• dispensing a quantity of the liquid substance from the tank into each container through the filler valves while maintaining the mouth of the container open to the surrounding atmosphere;
• depressurizing the tank and maintaining the tank at a pressure less than the atmospheric pressure registering at the filler mouth of each container;
• advancing the containers during the dispensing step along the second predetermined path toward a second transfer station from which the filled containers run out.