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 . <EOS>