The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 09, 1991
Filed:
Aug. 06, 1990
Herbert H Walton, Marshalltown, IA (US);
Randy J Hall, Marshalltown, IA (US);
Fisher Controls International, Inc., Clayton, MO (US);
Abstract
A sliding stem valve for controlling fluid flow in a valve body having a seat, a bonnet, a valve stem and plug slidably mounted in the bonnet for engaging the seat during valve shut-off, and a diaphragm forming a stem seal for preventing the undesired leakage of fluid into the atmosphere. The diaphragm is formed of elastomeric material with bead edges at opposite ends. The top diaphragm bead edge is sealed with a retainer to the bonnet. The bottom diaphragm bead seal is sealed to the valve stem while enabling the valve stem to rotate with respect to the bottom diaphragm bead edge. A sized retainer, bushing and retainer ring mount the bottom diaphragm bead edge to the valve stem and permit slidable motion of the bead edge with the valve stem while enabling the valve stem to rotate with respect to the bead edge and still maintain a viable diaphragm seal.