Control valve
Patent 4666126 Issued on May 19, 1987. Estimated Expiration Date: 
January 8, 2006. 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.
January 8, 2006. 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 158296 2253460 3099432 3207171 3892384 High force-gain valve Valve for adjusting the rate of flow of a gaseous fluid Patent #: 4500070 InventorsAssigneeApplicationNo. 06/817255 filed on 01/08/1986US Classes:251/282, Reciprocating251/333Particular head and seat cooperationExaminersPrimary: Schwadron, Martin P.Assistant: Novack, Sheri M. Attorney, Agent or FirmInternational ClassesF16K 39/02 (20060101)F16K 31/02 (20060101) F16K 39/00 (20060101) F16K 1/32 (20060101) F16K 1/34 (20060101) Foreign Application Priority Data1985-07-23 JPAbstractA control valve in which a surface of a valve seat closer to a valve body is formed so as to be flat. A valve head corresponding to an annularly formed fluid-communication passage is provided with an annular inner convex projection and an annular outer convex projection. These projections engage with the flat surface of the valve seat on the inner side and the outer side of the fluid-communicating passage, respectively. The valve head is provided with a communicating passage for providing communication between a valve body-driving portion side thereof and a valve seat surface side containing the inner convex projection. | |
