Abstract: A spray gun suitable for use with both high volume, low pressure (HVLP) air and compressed air sources for atomizing liquids includes a housing; a nozzle attached to said housing for controlling liquid flow therethrough; a high volume, low pressure air inlet and a compressed air inlet, both disposed in the housing. An air chamber is provided within the housing having sufficient volume to enable high pressure air introduced therein to expand to a pressure equivalent to the pressure of the high volume, low pressure air source; and a high pressure valve is provided for introducing air from the high pressure inlet into the air chamber.

Abstract: A spray gun using high volume, low pressure air includes a liquid nozzle with a conical face and a coaxial liquid outlet therein and a housing having an air chamber of greater diameter than a diameter of said liquid nozzle, for providing atomizing air to an air cap, fitted to said air chamber. The air cap has a centered opening therein subtended by a radially expanding frusto-conical surface, for accepting the conical face of said liquid nozzle. Pattern adjusting outlets are provided for directing air in a direction towards the liquid nozzle axis. A distributor, disposed within said air chamber controls and releasably coupled to the air cap, in combination with said air cap, air flow to said pattern adjusting outlets from the air chamber. The distributor is coupled to the air cap, in a manner enabling rotational movement of said air cap to control air flow to said pattern adjusting outlet.

Abstract: A high volume, low pressure impeller apparatus is provided for the spraying of liquids having a wide range of viscosities. The use of two serially interconnected impeller blowers enables the spraying of both stains and latex paints while still achieving fine sprayed coatings.