A coating system comprises a source of electrically non-insulative coating material, a dispenser for dispensing the coating material toward an article to be coated thereby, an electrostatic high potential for supplying charge to the coating material, means for coupling the high potential supply across the dispenser and the article, a first reservoir, and a first valve. The first valve has a first housing providing first, second, third, fourth and fifth ports, and a first component movable within the first housing and having a first passageway selectively to connect the first port to second port to permit the flow of coating material from the first port to the second port. The first port is coupled to the coating material source, the second port to the first reservoir, and the third port to the dispenser. The second port is coupled to the third port to permit the flow of coating material from the first reservoir to the dispenser. A source is provided for an electrically non-conductive fluid. The first housing and the first movable component define between them a second passageway, and the source of electrically non-conductive fluid is coupled to the fourth port to provide a flow of the electrically non-conductive fluid from the source of electrically non-conductive fluid through the second passageway to flush coating material from surfaces of the first housing and first movable component adjacent the second passageway and exit from the fifth port.