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:
Dec. 11, 1979
Filed:
Aug. 25, 1978
Anthony A Laitkep, Wharton, TX (US);
Danny S Meyer, Richmond, TX (US);
Willard J Sitton, Houston, TX (US);
ACF Industries, Incorporated, New York, NY (US);
Abstract
A packing assembly for a valve shaft or stem (8) consisting of inner and outer telescoping expander sleeves or rings (44, 46) slidably received intermediately in a stuffing box (32) between two groups of elastomeric sealing rings (F, G). Semi-fluid plastic sealing material is injected (60) between the expander rings to move them apart and thereby axially compress and radially expand the seal rings into sealing engagement with the stem or shaft and box wall. Portions of the plastic material pass through radial holes in the inner expander ring to form secondary seals within and about these rings.