Plastic lined rotatable valve
Patent 4696323 Issued on September 29, 1987. Estimated Expiration Date: 
August 30, 2005. 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.
August 30, 2005. 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 563946 2014577 2202735 2988320 3334650 3336939 3394914 3498315 3647179 Ball valve InventorAssigneeApplicationNo. 06/771191 filed on 08/30/1985US Classes:137/375, Jacketed251/174, Spring251/315.05, Nonmetallic251/315.13, Assembled around the head251/367SectionalExaminersPrimary: Chambers, A. MichaelAttorney, Agent or FirmInternational ClassesF16K 27/02 (20060101)F16K 5/06 (20060101) AbstractDisclosed is a plastic lined rotatable valve. The valve includes a valve body that is formed by at least two connected together body parts or halves. Each body half is lined with an inert plastic material. The seal between the body halves or parts is provided by sealing flanges on the plastic lining. The sealing flanges are resiliently urged together, thereby to compensate for cold flow and to isolate the sealing flanges from stresses on the valve body due to uneven piping loads. The valve body halves or parts include rims about the junction where the halves or parts are joined together which form a rigid shell for the valve body, which further isolates the sealing flanges from mechanical stresses. The valve includes a plastic encapsulated valve member that is rotatable by a plastic encapsulated stem. A packing is provided for sealing between the stem and valve body. | |
