Fluid dispenser

A fluid dispenser comprising:

• a containing case having an inner containment cavity for containing a first fluid to be dispensed, the containing case being delimited by at least one pair of walls including at least one flexible first wall of said at least one pair of walls being placed in contact with the first fluid to be dispensed, a flexible second wall of said at least one pair of walls at least partly surrounding said at least one first wall;
• a closable hollow space, positioned between said at least one first wall and said second wall;
• a second fluid which being introduced into the hollow space and interacting with said first wall imparts to the first fluid to be dispensed a movement towards an outlet of said case and a simultaneous action at least of expelling to the outside of said case the gases present in the containment cavity;
• a flange joined to at least one of the walls of said pair of walls;
• and
• a first duct for conveying said second fluid into the closable hollow space, said first duct formed in a projection of said flange,
• wherein said flange has a flat plate shaped like an annulus and a tubular collar, the tubular collar terminating with a supplying outlet at a distal end spaced from the flat plate,
• wherein said flat plate extends beyond an area covered by said tubular collar, and
• wherein the projection projects radially away from the collar and axially from a surface of the flat plate.