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A gas flow check valve for a bottle filling device employs a piston received within a bore which is maintained at the bottom of the filling head vent tube. The piston has a head thereon which is interposed within the flow path of escaping gas during the filling operation. The escaping gas impinges u

A gas flow check valve for a bottle filling device employs a piston received within a bore which is maintained at the bottom of the filling head vent tube. The piston has a head thereon which is interposed within the flow path of escaping gas during the filling operation. The escaping gas impinges upon the underside of the head and urges the same toward a sealing position. An opposite end of the piston extends downwardly into the bottle being filled. When the level of the beverage within the bottle reaches the bottom of the piston, the buoyancy of the piston, coupled with the forces of the escaping gas impinging upon the piston head urge the piston into sealing engagement, terminating the escape of gas and similarly terminating the inward flow of beverage or liquid, terminating the filling operation.

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In a bottle filling device of the counter pressure filling type, having a vent tube for extension into the interior of a bottle to be filled, the improvement of a gas flow check valve, comprising: a housing received by the vent tube; a piston slidingly received within said housing and movable betwee

In a bottle filling device of the counter pressure filling type, having a vent tube for extension into the interior of a bottle to be filled, the improvement of a gas flow check valve, comprising: a housing received by the vent tube; a piston slidingly received within said housing and movable between first and second stops, said piston selectively enabling and inhibiting communication of the vent tube with the interior of the bottle, said housing having openings through which said communication between the vent tube and the interior of the bottle is achieved; and wherein said piston has a head extending from an upper end of said piston, said head having a bottom flange, and a gas flow path is defined from the interior of the bottle, through said openings, and into the vent tube, said bottom flange being interposed in said gas flow path when said piston engages said second stop, gas movement in said gas flow path engaging said bottom flange and urging said piston toward said first stop, and wherein a lower end of said piston extends from said housing and is positioned to engage a rising level of fluid in the bottle during a filling operation, said engagement of said piston by the fluid, combined with said engagement of said gas movement with said bottom flange, actuating sealing engagement of said piston with said first stop.