Flow control valve assembly minimizing generation and entrapment of contaminants
Patent 5165655 Issued on November 24, 1992. Estimated Expiration Date: 
July 12, 2011. 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.
July 12, 2011. 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 2349209 Ball-type vacuum valve for leak detection apparatus Valve operating without friction Valve unit Patent #: 4911405 InventorsAssigneeApplicationNo. 729075 filed on 07/12/1991US Classes:251/129.02, With means to bias valve open137/901, BIASED BALL VALVES WITH OPERATORS251/129.17, Having diaphragm between coil and opening controlled251/303, Biased251/368MaterialsExaminersPrimary: Rosenthal, ArnoldAttorney, Agent or FirmInternational ClassF16K 031/06AbstractA hermetically sealed, precision fluid valve assembly including a ball valve element is disclosed. The assembly includes a valve element retainer comprising a thin, flexible member having a first portion operatively associated with the valve element and a second portion, extending from the first, secured to the body of the valve assembly. The valve element retainer guides the motion of the valve element and is designed to reduce friction and eliminate the generation and entrapment of contaminants, thereby minimizing hysteresis in the operation of the valve. | |
