Device for dispensing a small quantity of a liquid product

A method for introducing a liquid product into a container, the method comprising the steps of:

• providing a device comprising a dispensing head comprising an injection nozzle, the dispensing head being adapted to dispense a desired quantity of liquid product by the injection nozzle,
• the dispensing head comprising an inlet adapted to be connected to a source of the liquid product and an outlet provided with the injection nozzle,
• wherein the dispensing head comprises a first valve and a second valve installed in series, such that:
• an inlet of the first valve forms the inlet of the dispensing head,
• an outlet of the first valve is fluidically connected to an inlet of the second valve,
• a fluid outlet of the second valve is provided with the nozzle, and
• wherein the device comprises a control system configured to command an opening sequence of the first valve and of the second valve, resulting in a time of concomitant opening of said first valve and said second valve,
• issuing, by the control system, a first command for opening one of the first valve and the second valve,
• issuing, by the control system, a second command for opening the other one of the first valve and the second valve, and
• such that a time of concomitant opening of the first valve and of the second valve is obtained.