The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 20, 2001
Filed:
Feb. 29, 2000
Fred A. Miller, Elburn, IL (US);
Randal S. Aspen, Oswego, IL (US);
Spraying Systems Co., Wheaton, IL (US);
Abstract
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.