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:
Jun. 26, 2001
Filed:
Mar. 31, 2000
Applicant:
Inventor:
Raoul W. Robert, Baton Rouge, LA (US);
Assignee:
T & R Solutions, Inc., Prairieville, LA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K 4/300 ; F16K 4/104 ;
U.S. Cl.
CPC ...
F16K 4/300 ; F16K 4/104 ;
Abstract
A valve stem has a thickness of hardfaced material on its outer diameter in the area contacting the stem packing where the seal is formed which prevents corrosion, erosion and/or scratching of the valve stem, thereby preventing formation of leak paths. A valve packing comprises a vertically stacked array comprising alternating metal pressure rings and graphite seals.