Filling device having a special valve system

Filling device comprising

• a filling spout comprising a globally tubular body having an inner passage with a longitudinal axis and an open lower axial end constituting a discharge aperture of the filling spout, an inner surface of the tubular body comprising a lower portion comprising a portion defining a main valve seat,
• means for metering comprising a valve system mounted movably in the filling spout, and a control system able to longitudinally displace said valve system between a closed state wherein the valve system comes via a main closing portion of an exterior surface against the main valve seat in order to close the discharge aperture, and at least one open state wherein said main closing portion is separated from said main valve seat,
• wherein said valve system comprises a first tubular main valve, comprising a lower annular edge delimiting a lower secondary aperture, an outer surface comprising a lower portion that extends to said lower edge and which comprises said main closing portion, an inner surface comprising a lower portion extending to said lower edge comprising a portion forming a secondary valve seat, and
• a second cylindrical central valve, mounted movably in the main valve, and comprising a lower end edge, an outer surface comprising a low portion that extends to said lower end edge and which comprises a secondary closing portion,
• said control system being able to displace the main valve between a closed position, wherein said main closing portion is against the main valve seat, and at least one open position wherein said main closing portion is separated from the main valve seat, and able to displace the central valve between a closed position wherein a secondary closing portion is against the secondary seat and at least one open position wherein said secondary closing portion is separated from the secondary seat,
• said main valve comprising at least one opening guaranteeing a fluid communication between an inner passage and the inner passage of the spout, and
• said lower edge of the main valve being provided with radial grooves, exiting onto the inner surface of said main valve.