Flow reducing devices particularly useful as drip emitters for drip irrigation
Patent 4084749 Issued on April 18, 1978. Estimated Expiration Date: 
April 18, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 18, 1995. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2760824 3791587 3882892 3924881 Flow control valve Patent #: 4011893 InventorApplicationNo. 715545 filed on 08/18/1976US Classes:239/271, WITH NOZZLE OR FLOW LINE ATTACHED PENETRATING MEANS137/505.13, Senses inlet pressure137/517, Biased open138/42, Tortuous path239/542, CONDUIT OR NOZZLE ATTACHED IRRIGATION-TYPE DECELERATOR239/547, DISTRIBUTOR OR NOZZLE IN CIRCUMFERENTIAL WALL OF FLEXIBLE SUPPLY LINE239/571Flow direction responsive valveExaminersPrimary: Blunk, Evon C.Assistant: Kashnikow, Andres Attorney, Agent or FirmInternational ClassesA01G 025/16B05B 001/30 Foreign Application Priority Data1976-04-11 ILAbstractFlow-reducing devices particularly useful as drip emitters comprise a housing having a closure cap snap-fitted thereto and enclosing a flow-retarding member formed with a plurality of recesses on opposite faces each recess bridged by a pair of holes to provide a serial path for the flow of the water through the holes from one face to the opposite face. Also described is the use of a regulator including a valve member sensing the fluid pressure at the inlet of the device to produce a substantially uniform output of water despite variations in the line pressure at the inlet.Field of SearchWITH PRESSURE OR FLOW EQUALIZATION MEANS TO PLURAL DISTRIBUTORSWith flow controller Terminal outlet means in or on flow line coupling With casing or support WITH NOZZLE OR FLOW LINE ATTACHED PENETRATING MEANS Piercing connection to supply means CONDUIT OR NOZZLE ATTACHED IRRIGATION-TYPE DECELERATOR DISTRIBUTOR OR NOZZLE IN CIRCUMFERENTIAL WALL OF FLEXIBLE SUPPLY LINE Line fluid operated Flow direction responsive valve Downstream flow to outlet closes valve WITH FLOW REGULATORS AND/OR BAFFLES Variable restriction Central path Restrictors Variable restriction Variable restriction With screen Tortuous path Baffle or zigzag flow restrictor Senses inlet pressure Biased open Reactor surface normal to flow Responsive to change in rate of fluid flow Valve closes in response to excessive flow Valve seating in direction of flow Direct response valves (i.e., check valve type) With retarder or dashpot Spring biased Spring coaxial with valve Valve stem extends through fixed spring abutment | |
