A dual induction apparatus for high volume low pressure spraying systems is provided. The invention includes an atomizing tube with an entrance, a midpoint and an exit. A jet nozzle is connected to the entrance of the atomizing tube. A first plurality of induction ports pass through the sidewalls of the atomizing tube proximal the jet nozzle. The first plurality of induction ports are in communication with ambient air. When the compressed air passes through the jet nozzle a low pressure field is formed causing ambient air to be drawn into the atomizing tube. A venturi element is located inside the atomizing tube in the area about the midpoint to the exit. A tube in communication with the removable venturi element is passed through the sidewall of the atomizing tube. The tube is affixed in a perpendicular fashion to the aperture in the venturi element on its first side and is further connected to a reservoir of paints, powders, solvents or other substances. The tube may be mated to the atomizing tube in a removable sliding lock fashion. By the prior action of compressed air passing through the jet nozzle the low pressure field is formed and is maintained with ambient air having been inducted into the atomizing tube through the first plurality of ports. The pressure at the midpoint of the atomizing tube is also sufficiently low to cause a suction through the tube drawing the atomizable substance from its reservoir into the cylindrical element located along the centerline of the atomizing tube. The liquid drawn through the tube and into the cylindrical element is entrained and atomized into the low pressure air. At this point the atomized substance passes through the atomizing tube exit where it is delivered to its target.

Apparatus and methods for swivel attachment of supply vessels to applicator devices are disclosed. In one embodiment, an apparatus includes an applicator device, a supply vessel having an interior volume, and a swivel assembly coupled between the supply vessel and the applicator device. The swivel assembly includes a first engagement member having a protruding portion and a first passageway disposed therethrough, and a second engagement member having a concavity and a second passageway disposed therethrough, the protruding portion being moveably engaged within the concavity such that the interior volume of the supply vessel fluidly communicates with the applicator device through the first and second passageways.

Modular spray gun apparatus and methods are disclosed. In one embodiment, an apparatus includes a handle module and a head module that is removeably coupled to the handle module. The head module includes a first housing having an inlet adapted to be coupled to a source of pressurized gas, a flow passage extending between the inlet and an outlet, and a first coupling member proximate the outlet. Similarly, the head module includes a second housing having a second coupling member removeably coupled to the first coupling member of the first housing, a nozzle fluidly communicating with a spray outlet, and a needle assembly operatively associated with the nozzle to control a flow of liquid material and pressurized gas emanating from a mixing passage through the nozzle.

Modular spray gun apparatus and methods are disclosed. In one embodiment, an apparatus includes a handle module and a head module that is removeably coupled to the handle module. The head module includes a first housing having an inlet adapted to be coupled to a source of pressurized gas, a flow passage extending between the inlet and an outlet, and a first coupling member proximate the outlet. Similarly, the head module includes a second housing having a second coupling member removeably coupled to the first coupling member of the first housing, a nozzle fluidly communicating with a spray outlet, and a needle assembly operatively associated with the nozzle to control a flow of liquid material and pressurized gas emanating from a mixing passage through the nozzle.