Self-cleaning precision metering valve
Patent 4099703 Issued on July 11, 1978. Estimated Expiration Date: 
October 12, 1996. 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.
October 12, 1996. 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 2925242 2977087 3119449 3342451 3409271 3419246 3441249 InventorApplicationNo. 05/731523 filed on 10/12/1976US Classes:251/122, Tapered metering plug251/205, WITH SELECTIVE FLOW REGULATION251/285AdjustableExaminersPrimary: Rosenthal, ArnoldAttorney, Agent or FirmInternational ClassesF16K 1/52 (20060101)F16K 1/38 (20060101) F16K 1/32 (20060101) AbstractAn adjustable needle valve provided with an orifice and a needle valve stem is characterized by a finely calibrated adjustment means connected to the valve stem for controlling variations in the flow of fluid in a system, the needle valve stem being biased so as to be normally urged toward an orifice to restrict the flow of fluid, but which can be manually retracted from the orifice to a position allowing a full stream of fluid to flow through the orifice to flush out foreign particles which may have lodged between the orifice and the needle valve stem. When the needle valve stem is released, it returns to its previously adjusted position within the orifice without having to be reset by the adjustment means. | |
