VALVE CONTROLLED SPRAYING SYSTEM

摘要

A spraying system having a control valve (15) with an inlet (40) for connection to a liquid supply, a discharge port (41) for connection to a nozzle (14), and a return (42) for connection to the supply. The control valve includes a valve member (46) which has a flow passageway and is movable between an open position in which the flow passageway communicates between the inlet and discharge ports for permitting the direction of pressurized liquid to the nozzle and a second position which prevents the flow of liquid to the discharge port. The nozzle has a pressure responsive check valve (80) for preventing the flow of liquid to the nozzle, and hence for preventing drippage, upon movement of the control valve member to the off position. To accelerate actuation of the check valve, and minimize undesired drippage from the nozzle, the control valve member is formed with a relief passage (88) separate from the liquid flow passage.