초록 ▼

A spraying system having a control valve with an inlet port for connection to a liquid supply, a discharge port for connection to a spray nozzle, and a return port for connection to the liquid supply. The control valve includes a valve member which has a liquid flow passageway and is movable between

A spraying system having a control valve with an inlet port for connection to a liquid supply, a discharge port for connection to a spray nozzle, and a return port for connection to the liquid supply. The control valve includes a valve member which has a liquid flow passageway and is movable between an open position in which the liquid flow passageway communicates between the inlet and discharge ports for permitting the direction of pressurized liquid to the spray nozzle and a second position which prevents the flow of pressurized liquid to the discharge port. The spray nozzle has an associated pressure responsive check valve for preventing the flow of liquid to the spray 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 hence, minimize undesired drippage and dribbling from the spray nozzle, the control valve member is formed with a relief passage separate from the liquid flow passage which upon movement of the control valve member to the off position communicates between the discharge and return ports for bleeding liquid downstream of the control valve to the return port and more rapidly lowering downstream line pressure and actuating the check valve.

대표청구항 ▼

[ What is claimed is:] [1.] A spraying systems comprisingat least one spray nozzle having a discharge orifice for directing a liquid spray;a control valve having a housing;said housing having an inlet port, a discharge port, and a return port,a first liquid supply line for connection between said in

[ What is claimed is:] [1.] A spraying systems comprisingat least one spray nozzle having a discharge orifice for directing a liquid spray;a control valve having a housing;said housing having an inlet port, a discharge port, and a return port,a first liquid supply line for connection between said inlet port and said liquid supply whereby a pressurized liquid flow stream may be directed to said inlet port;a return line for connection between said return port and said liquid supply;a second liquid supply line for connection between said discharge port and said spray nozzle;said control valve having a movable valve member supported within said housing;said valve member having a liquid flow passage and being movable in said housing between a first position in which said liquid flow passage communicates between said inlet and discharge ports for permitting the direction of pressurized liquid to said second supply line and said spray nozzle and a second position in which said control valve member prevents the flow of pressurized liquid to said discharge port, said second supply line, and said spray nozzle;said spray nozzle having an associated check valve that is closeable for preventing the flow of liquid to said spray nozzle in response to liquid pressure in said second supply line falling below a predetermined level;and said control valve member having a relief passage separate from said liquid flow passage and which upon movement of said control valve member to said second position communicates between said discharge and return ports for bleeding liquid from said second supply line through said discharge port to said return port for rapidly lowering pressure in said second supply line and rapidly closing the check valve associated with the spray nozzle.