A full cone liquid spray nozzle comprising: a nozzle body having a discharge orifice at a downstream end and an inlet at an upstream end for connection to a liquid supply, a liquid flow passageway through said body communicating between said inlet and said discharge orifice, a vane disposed within said passageway upstream of said discharge orifice, said vane having a frustoconical downstream end with a frustoconical outer peripheral surface that tapers inwardly in a downstream direction, said liquid flow passageway defining a whirl and mixing chamber between said vane and said discharge orifice, said vane having a central orifice coaxial with said discharge orifice for directing an axial flow stream from the vane into said whirl and mixing chamber and at least three angled passages circumferentially disposed about said central orifice for tangentially directing a plurality of liquid flow streams into said whirl and mixing chamber for creating liquid turbulence, breakdown, and intermixing with said axial flow stream such that liquid emitted from said discharge orifice has a conical spray pattern with liquid particles distributed throughout the spray pattern, said frustoconical downstream end of said vane and a surrounding cylindrical wall of the whirl and mixing chamber defining an annular chamber expanding in a downstream direction communicating with said whirl and mixing chamber, said angled passages communicating with and discharging liquid in part into said expanding annular chamber characterized by said angled passages being defined by outwardly opening rectangular or U shaped slots formed in the frustoconical outer peripheral surface of the vane. a nozzle body having a discharge orifice at a downstream end and an inlet at an upstream end for connection to a liquid supply, a liquid flow passageway through said body communicating between said inlet and said discharge orifice, a vane disposed within said passageway upstream of said discharge orifice, said vane having a frustoconical downstream end with a frustoconical outer peripheral surface that tapers inwardly in a downstream direction, said liquid flow passageway defining a whirl and mixing chamber between said vane and said discharge orifice, said vane having a central orifice coaxial with said discharge orifice for directing an axial flow stream from the vane into said whirl and mixing chamber and at least three angled passages circumferentially disposed about said central orifice for tangentially directing a plurality of liquid flow streams into said whirl and mixing chamber for creating liquid turbulence, breakdown, and intermixing with said axial flow stream such that liquid emitted from said discharge orifice has a conical spray pattern with liquid particles distributed throughout the spray pattern, said frustoconical downstream end of said vane and a surrounding cylindrical wall of the whirl and mixing chamber defining an annular chamber expanding in a downstream direction communicating with said whirl and mixing chamber, said angled passages communicating with and discharging liquid in part into said expanding annular chamber characterized by said angled passages being defined by outwardly opening rectangular or U shaped slots formed in the frustoconical outer peripheral surface of the vane.