Patent ID: 7963305

Claim:
Filling valve ( 5 ) comprising: a hollow housing ( 11 ) having a valve seat ( 25 ); a moving valve rod ( 14 ) slidingly mounted in the housing ( 11 ) and having a sealing surface ( 23 ), said moving valve rod ( 14 ) and said hollow housing ( 11 ) together defining a liquid chamber ( 18 ); a liquid inlet ( 26 ) for putting said liquid chamber ( 18 ) into communication with a liquid supply pipe ( 6 ); a first piston ( 29 ) rigidly attached to the valve rod ( 14 ), slidingly mounted in the housing ( 11 ) and defining with respect to the same a first stroke (S 1 ) between an upper position where the first piston ( 29 ) puts said valve rod ( 14 ) in a first, full-open position, in which said sealing surface ( 23 ) is spaced from said valve seat ( 25 ), thereby forming a passage ( 27 ) for the liquid, and an lower position where the first piston ( 29 ) puts said valve rod ( 14 ) in a second, closed position, in which said sealing surface ( 23 ) is in sealing contact with said valve seat ( 25 ), thereby closing said passage ( 27 ), a second piston ( 36 ) slidingly mounted in the housing ( 11 ) and defining with respect of the same a second stroke (S 2 ) shorter than said first stroke, between an upper position in which the second piston ( 36 ) permits the first piston ( 29 ) to reach its upper position, and a lower position in which the second piston ( 36 ) blocks the first piston ( 29 ) in an intermediate position where the first piston ( 29 ) puts said valve rod ( 14 ) in a third, predetermined, semi-open position in which said sealing surface ( 23 ) is spaced from the valve seat ( 25 ) but closer to the same than in the full-open position, characterized in that said first piston ( 29 ) has a top end surface ( 45 ) which, in the upper and intermediate positions, comes into abutment with a bottom end surface ( 46 ) of the second piston ( 36 ).