The invention relates to a valve (10, 100) for a machine for manufacturing plastic containers, said valve (10) having at least: an intake (12), connected to a high-pressure fluid source, and an outlet (14), which communicate selectively through a valve body (16) comprising an inner bore (18) in which a stopper (20) slides axially; a chamber (22) for controlling the stopper, defined axially by a main surface (24) of the stopper (20) and supplied with a control fluid in order to cause the axial sliding of said stopper (20) in the bore (18) between at least one first closed position and a second open position of the valve; means (28) for guiding the stopper (20), having at least one portion (66) which penetrates axially into said stopper (20), characterised in that the stopper (20) is made up of a tubular part into which the high-pressure fluid is introduced axially and in that the stopper (20) has at least one radial passage opening (50) through which the high-pressure fluid passes when the stopper is in the second, open position of the valve.