An electrostatic air atomization spray coating system having a hand held spray gun, wherein a flow of air to the gun is sensed to control energization of a high voltage power supply for electrostatically charging spray particles, is characterized by a bypass valve on the spray gun which selectively permits air atomization spraying with or without electrostatics.
Abrasive jet machining apparatus employs a stream or mist of electrically grounded solution of a conducting electrolyte directed at or adjacent the work removal site of a workpiece to instantaneously discharge to ground all static charge build-up formed on the workpiece by the gas/abrasive powder stream as a result of the removal.
An electrostatic spray gun having an electrode for applying an electrostatic charge to coating material. A lever is provided for controlling both the flow of material from the spray gun as well as the position of a first magnet. The first magnet, in turn, controls a first magnetically actuatable electric switch for connecting and disconnecting a high voltage to the electrode. A second magnetically actuatable electric switch, controlled by the position of a second magnet, is electrically connected in series with the first switch, so that the high voltage can be disconnected from the electrode regardless of the position of the actuating lever. The spray gun can therefore be operated with or without the application of an electrostatic charge to the coating material.
The present invention is directed to methods and apparatus for spraying liquid compositions by airless spray techniques which avoid fishtail spray patterns and desirably obtain feathered spray patterns through use of spraying coating formulations which contain supercritical fluid.
A manual spray-coating gun comprising at least one manual setting/operating element (40, 42) to manually change operational values and transmitting the desired operational values to a control unit (4) situated outside the gun.
A method and apparatus are provided to regulate the flow of compressed air and steam utilized in treating spots in cloth or clothes with a spotting table having a spotting gun. The method comprises first turning on the steam or compressed air of the spotting table using conventional foot valves and next throttling the steam or compressed air flow to a desired level by manipulating a valve provided on the spotting gun, which valve can be manipulated and set by the spotting gun operator with the same hand holding the spotting gun.
