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A powder spray gun for applying particulate powder material onto a surface includes a gun body having a venturi transfer pump which receives air-entrained particulate powder material from a supply conduit and distributes the powder for discharge into a discharge conduit connected to the gun body. A

A powder spray gun for applying particulate powder material onto a surface includes a gun body having a venturi transfer pump which receives air-entrained particulate powder material from a supply conduit and distributes the powder for discharge into a discharge conduit connected to the gun body. A spray head formed with a powder discharge slot is mounted to said discharge conduit. The discharge conduit is formed with a bend, preferably of about 90°, to concentrate the powder material along an outer wall formed by the bend for delivery in a concentrated stream to the spray head. A deflector is preferably mounted within the discharge conduit to direct the concentrated powder stream into the spray head in a predetermined manner. The powder discharge slot, which has a predetermined width and is formed by angled side walls meeting at an apex, receives the concentrated powder stream from the discharge conduit and sprays the powder in a wide, uniform spray pattern onto a surface.

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A powder spray gun for spraying air-entrained particulate powder material comprising: a gun body having a powder inlet and a powder outlet; means for connecting said powder inlet of said gun body to a source of air-entrained particulate powder material; a conduit having an inlet end connected to sai

A powder spray gun for spraying air-entrained particulate powder material comprising: a gun body having a powder inlet and a powder outlet; means for connecting said powder inlet of said gun body to a source of air-entrained particulate powder material; a conduit having an inlet end connected to said powder outlet of said gun body for receiving particulate powder material and an outlet end, said conduit having a bend between said inlet end and said outlet end, said bend having an outer wall on one side of said conduit, the particulate powder material in the course of flow through said conduit being concentrated in a powder flow stream along said outer wall of said bend in said conduit; a spray head mounted to said outlet end of said conduit, said spray head being formed with a powder discharge slot terminating in a powder spray orifice; deflector means mounted within said conduit for contacting and directing said concentrated stream of particulate powder material into a predetermined portion of said powder discharge slot of said spray head and out said powder spray orifice for dispersion onto a substrate.