Filling valve group for a filling machine

A filling valve group for a filling machine, said filling valve group comprising:

• a supply duct (2) susceptible of being placed in fluid communication with a containment tank (105) fixed to a support structure (104) of a filling machine, for flowing a liquid from said containment tank (105) to a container (102) to be filled with said liquid;
• wherein said supply duct (2) is extended along a main extension axis (X) between an inlet section (21) and an outlet section (22), at which said supply duct (2) is susceptible of being associated with said container (102);
• an air return tube (3), which is extended along said main extension axis (X) and is placed at least partially within said supply duct (2);
• a shutter (4), which is placed to intercept said supply duct (2) and is provided with a narrowing portion (41) fixed to said supply duct (2), and with an enlarged portion (42) fixed to said air return tube (3) and movable with respect to said narrowing portion (41) in order to open and close said shutter (4);
• a centering body (5), which is mounted on a lower portion (11) of said filling valve group, is placed at the outlet section (22) of said supply duct (2), and comprises a seal (51) defining a first lower surface (52) susceptible of receiving in abutment a mouth of said container (102);
• wherein said centering body (5) is removably fixed to the lower portion (11) of said filling valve group by means of a first quick coupling (6);
• a fixed assembly (12), which is mechanically and rigidly connectable to the support structure (104) of the filling machine, and forms an upper section (23) of the supply duct (2);
• a removable tube (7), which forms a lower section (24) of the supply duct (2) and is removably fixed to said fixed assembly (12) by means of a second quick coupling (8), said removable tube (7) carrying, fixed thereto, the narrowing portion (41) of said shutter (4);
• wherein the narrowing portion (41) of said shutter (4) comprises a flared wall (411) that is extended from a narrow internal section (25) of said supply duct (2) to said enlarged outlet section (22) of said supply duct (2) for the evacuation of said liquid.