External mix miniature spray gun

摘要

The spray gun obtains a spray of paint by directing a jet of gas from a source over a nozzle (9). A control valve for the gas flow is connected at one end (26) to the source and an outlet (29) at the other end for discharge into the body of the gun. The valve inlet leads to first radial flow passages (27) opening to the side of the valve body and second radial flow passages (28) leading from the side of the valve body to the outlet. - A sleeve (2) is rotatably retained on the valve body by interengaging threads, and spans between the first and second radial passages to define an internal space for gas flow. At small degrees of valve opening, the second radial bores are masked by the threads (30) of the sleeve so that the threads provide a flow resistance facilitating control at low gas flow rates. (1/3) GBAB- GB2146271 B The spray gun obtains a spray of paint by directing a jet of gas from a source over a nozzle (9). A control valve for the gas flow is connected at one end (26) to the source and an outlet (29) at the other end for discharge into the body of the gun. The valve inlet leads to first radial flow passages (27) opening to the side of the valve body and second radial flow passages (28) leading from the side of the valve body to the outlet. - A sleeve (2) is rotatably retained on the valve body by interengaging threads, and spans between the first and second radial passages to define an internal space for gas flow. At small degrees of valve opening, the second radial bores are masked by the threads (30) of the sleeve so that the threads provide a flow resistance facilitating control at low gas flow rates. (8pp Dwg.No.1/3) USAB- US4606501 A The external mix miniature spray gun of the airbrush type obtains a spray of paint by directing a jet of gas from a source over a nozzle. A reducing valve for the flow of gas is connected at one end to the source and to an outlet at the other end for discharge into the body of the gun. The reducing valve includes a body of circular end profile with the inlet leading to first generally radial flow passages opening to the side of the valve body and second generally radial flow passages leading from the side of the valve body to the outlet. - A sleeve is rotatably retained on the valve body by interengaging threads and spans between the first and second radial passages to define an internal space for gas flow. A tapered surface in the gas flow space on the interior of the sleeve is arranged to approach or withdraw from a portion of the valve body to enlarge or diminish the gap between as the sleeve is rotated relative to the body. At small degrees of valve opening the second radial passages are masked by the threads of the sleeve so that the threads provide a flow resistance facilitating control at low gas flow rates.