Axial spray nozzle with vented valve, comprising: - a spray nozzle body comprising an internal conduit, extending along an elongation axis (XX'), said conduit having a symmetry of revolution about the elongation axis (XX'), comprising a first end and a second end, and being defined by an internal surface of the spray nozzle body, - a valve seat located at the first end of the internal conduit, comprising a port forming a fluid inlet to the spray nozzle, - a valve guide comprising a tubular sleeve and a retaining element, the sleeve forming a channel, open at a third end, and closed by a bottom at a fourth end, the retaining element holding the sleeve in the internal conduit and coaxially with said conduit, the third end facing and being set back from the port in the valve seat, the sleeve leaving a space between its peripheral surface and the internal surface of the spray nozzle body so as to enable fluid flow along a fluid flow direction, between the fluid inlet and a fluid outlet, - a plug mounted free to slide axially in the channel of the sleeve, the plug being pushed into contact with the port in the valve seat by a compression spring, housed in the sleeve and stopped in contact with the bottom of the sleeve, so as to close off the port in the valve seat, Characterized in that the second end of the internal conduit forms the fluid outlet, and in that the valve guide comprises a radial vent, that comprises a vent channel isolated from the fluid flow in a leak tight manner, connecting the inside of the tubular guide sleeve at the reserve section, to a through radial drilling formed in the spray nozzle body. - a spray nozzle body comprising an internal conduit, extending along an elongation axis (XX'), said conduit having a symmetry of revolution about the elongation axis (XX'), comprising a first end and a second end, and being defined by an internal surface of the spray nozzle body, - a valve seat located at the first end of the internal conduit, comprising a port forming a fluid inlet to the spray nozzle, - a valve guide comprising a tubular sleeve and a retaining element, the sleeve forming a channel, open at a third end, and closed by a bottom at a fourth end, the retaining element holding the sleeve in the internal conduit and coaxially with said conduit, the third end facing and being set back from the port in the valve seat, the sleeve leaving a space between its peripheral surface and the internal surface of the spray nozzle body so as to enable fluid flow along a fluid flow direction, between the fluid inlet and a fluid outlet, - a plug mounted free to slide axially in the channel of the sleeve, the plug being pushed into contact with the port in the valve seat by a compression spring, housed in the sleeve and stopped in contact with the bottom of the sleeve, so as to close off the port in the valve seat, Characterized in that the second end of the internal conduit forms the fluid outlet, and in that the valve guide comprises a radial vent, that comprises a vent channel isolated from the fluid flow in a leak tight manner, connecting the inside of the tubular guide sleeve at the reserve section, to a through radial drilling formed in the spray nozzle body.