Filling unit to fill a container, in particular a cartridge, with a liquid product of the pharmaceutical industry

A filling unit (11) to fill a container (1) with a liquid product (5) of the pharmaceutical industry;

• the filling unit (11) comprising:
• a dosing head (12), which is arranged in a filling station (S1) and is designed to feed a quantity of product (5) into the container (1) through an open upper end of the container (1);
• a capping device (18), which is arranged in a capping station (S3) and is designed to insert a closing element into the container (1) and through the open upper end of the container (1);
• and
• a first sucking device (15), which is arranged in a degasification station (S2) located between the filling station (S1) and the capping station (S3), is designed to engage the open upper end of the container (1) in a sealing manner, and is designed to generate a depression inside the container (1) in an upper volume, which is not occupied by the product (5), wherein:
• the first sucking device (15) is designed to generate the depression inside the container (1) in the upper volume, which is not occupied by the product (5), by sucking only and exclusively air and without sucking any part of the product or any foam that is generated during feeding of the product.