The invention relates to a valve nozzle for introducing a pourable agent into a mixing chamber having a feed channel to which at least one nozzle aperture in a nozzle head is allocated and has an axially movable closure fitted on the discharge side of the nozzle aperture and is supported on actuating means which is connected to a closing spring and driving means, in which the feed channel (9) terminates at its end towards the mixing chamber in a calibrated inlet drilling (11) opening into a widening distribution chamber (20), said distribution chamber (20) opens into the mixing chamber and has a circumferential valve seat (21) for the closure (12) and the space between the valve seat (21) and the circumferential contour of the closure (12) forms the nozzle aperture when the closure (12) is open.
