Abstract: A system, including an electrostatic tool, including a material passage configured to deliver a material, an air passage through the electrostatic tool, and configured to deliver compressed air for spraying the material, and a first duckbill valve within the air passage and configured to block the backflow of the material in the air passage past the duckbill.

Abstract: A compressed gas-aided coating dispensing device includes a valve controlling the flow of compressed gas through the device. The device includes a port for coupling to a source of compressed gas and a port through which the compressed gas flows downstream from the valve. The valve includes a first valve member and a first seat cooperating to control flow through the device, and an operating member for controlling the relative positions of the first valve member and first seat. The valve further includes a second valve member and a second seat. The operating member also controls the relative positions of the second valve member and the second seat.

Abstract: A coating material dispensing system including a coating dispenser having a terminal for coupling to a high-magnitude potential supply, supply valves having respective input ports, respective output ports, and respective control ports, first purge valves having respective input ports, respective output ports, and respective control ports, a second purge valve having an input port, an output port and a control port, and means for coupling: the output port of a first one of the supply valves to a common point in a fluid circuit; the output port of a second one of the supply valves to the common point; the output port of the second purge valve to the common point; and, the common point to the coating dispenser, the common point also coupled to ground.