Abstract: A filling valve group for a filling machine, comprising a supply duct for delivering a liquid into a container, an air return tube, and a shutter provided with a narrowing portion fixed to the supply duct and an enlarged portion fixed to the air return tube. In addition, the filling valve group comprises a centering body, which is placed at the outlet section of the supply duct to abuttingly receive the mouth of the container, and is removably fixed to a lower portion of the filling valve group by a first quick coupling. The filling valve group further comprises a fixed assembly, which forms an upper section of the supply duct, and a removable tube, which forms a lower section of the supply duct, carries fixed thereto the narrowing portion of the shutter and is removably fixed to the fixed assembly by a second quick coupling.