Installation for charging liquids, particularly fermentation liquids, with gas

Pressure jet apparatus for charging a liquid with gas comprising a generally circular sectioned vessel disposed with its axis substantially vertical and having a top and bottom wall, a liquid inlet connection opening to said vessel adjacent the bottom wall thereof, a generally circular sectioned jet pipe leading downwardly from the bottom of the vessel for conducting liquid charged with gas from the vessel, an upwardly diverging, generally vertically disposed, conical insert secured to the upper end of said jet pipe and extending upwardly toward the top wall of said vessel, the lower end of said insert being of similar diameter to that of the upper end of said jet pipe, a vertically disposed gas inlet pipe arranged concentrically with said jet pipe and extending through the top wall and terminating close to the upper end of said jet pipe and defining there with an annular gap, that gap constituting means accelerating liquid passing therethrough, said jet pipe being free of diverging portions and the ratio of the cross sectional areas of said gas inlet pipe and said gap being directly related to the ratio of flows of gas and liquid through said pipe and said gap respectively.