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:
Apr. 13, 1993
Filed:
Oct. 15, 1991
Applicant:
Inventors:
Melvin L Osgood, Marshalltown, IA (US);
Rodney P Western, Marshalltown, IA (US);
Assignee:
Fisher Controls International, Inc., Clayton, MO (US);
Primary Examiner:
Int. Cl.
CPC ...
F16L / ; F16K / ;
U.S. Cl.
CPC ...
137 15 ; 137315 ; 251356 ; 403 30 ;
Abstract
A metal valve stem is attached to a ceramic valve plug. An elongated metal screw member has an expandable section securely wedged into a cavity in the plug as the attached screw/ceramic plug are threadably tightened on the valve stem. A first pre-wedging step presses an expander on the screw to fully bend the expander inside the ceramic cavity. The second wedging step during tightening of the screw/plug on the stem ensures uniform loading of the expander on the ceramic cavity surfaces.