Filling valve having a liquid chamber, a gas chamber and a medium chamber, and filling machine comprising the same

Filling valve (12) comprising:

• a hollow housing (21);
• a moving valve assembly (24) slidingly mounted in the housing (21), said moving valve assembly (24) and said hollow housing (21) together defining a liquid chamber (30) and a gas chamber (32);
• a liquid inlet (46) for putting said liquid chamber (30) into communication with a liquid supply pipe (14);
• a gas inlet (47) for putting said gas chamber (32)
• into communication with a gas supply pipe (17);
• wherein said hollow housing (21) and said moving valve assembly (24) together define a medium chamber (33) located between the liquid chamber (30) and the gas chamber (32), and wherein said filling valve (12) further comprises:
• a first diaphragm (35) linking the valve assembly (24) to the housing (21) between the liquid chamber (30) and the medium chamber (33), and
• a second diaphragm (36) linking the valve assembly (24) to the housing (21) between the gas chamber (32) and the medium chamber (33),
• and wherein said moving valve assembly (24) includes a hollow valve rod (25) provided with a through hole (43) opening in said gas chamber (32) at an upper end (37) of said valve rod (25).