A flash nozzle assembly (108; 200) for spray drying comprising: a nozzle having a nozzle distal end, a nozzle proximal end, a nozzle collar located between the nozzle distal end and the nozzle proximal end, first central passageway, a nozzle distal portion extending from a first side of the nozzle collar to the nozzle distal end, and a nozzle proximal portion extending from a second side of the nozzle collar to the nozzle proximal end; a manifold having a manifold distal end, a manifold proximal end, a second central passageway through which the nozzle is received, at least one manifold sweep gas passageway, and an internal shoulder portion that engages with the first side of the nozzle collar to restrict distal movement of the nozzle relative to the manifold; a wand body having a wand body distal end, a wand body proximal end, an inner tube with a groove in an enlarged portion of the inner tube at the wand body distal end, and at least one wand body sweep gas passageway; and a first sealing member positioned in the groove of the inner tube, wherein at least a portion of the nozzle proximal portion extends into the inner tube of the wand body with the first sealing member forming a radial seal between an outer surface of the nozzle proximal portion and the inner tube of the wand body, the flash nozzle assembly (108; 200) further comprising a gland end with a proximal portion that extends into the enlarged portion of the inner tube and a distal portion that engages with the second side of the nozzle collar to restrict proximal movement of the nozzle relative to the wand body; and a biasing member that is positioned between the distal portion of the gland end and the second side of the nozzle collar, wherein the biasing member biases the first side of the nozzle collar against the internal shoulder portion of the manifold. a nozzle having a nozzle distal end, a nozzle proximal end, a nozzle collar located between the nozzle distal end and the nozzle proximal end, first central passageway, a nozzle distal portion extending from a first side of the nozzle collar to the nozzle distal end, and a nozzle proximal portion extending from a second side of the nozzle collar to the nozzle proximal end; a manifold having a manifold distal end, a manifold proximal end, a second central passageway through which the nozzle is received, at least one manifold sweep gas passageway, and an internal shoulder portion that engages with the first side of the nozzle collar to restrict distal movement of the nozzle relative to the manifold; a wand body having a wand body distal end, a wand body proximal end, an inner tube with a groove in an enlarged portion of the inner tube at the wand body distal end, and at least one wand body sweep gas passageway; and a first sealing member positioned in the groove of the inner tube, wherein at least a portion of the nozzle proximal portion extends into the inner tube of the wand body with the first sealing member forming a radial seal between an outer surface of the nozzle proximal portion and the inner tube of the wand body, the flash nozzle assembly (108; 200) further comprising a gland end with a proximal portion that extends into the enlarged portion of the inner tube and a distal portion that engages with the second side of the nozzle collar to restrict proximal movement of the nozzle relative to the wand body; and a biasing member that is positioned between the distal portion of the gland end and the second side of the nozzle collar, wherein the biasing member biases the first side of the nozzle collar against the internal shoulder portion of the manifold.