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. 05, 1995
Filed:
Sep. 30, 1994
Kenneth R Albertson, West Valley City, UT (US);
Vernon R Bolinder, West Jordan, UT (US);
Parker-Hannifin Corporation, Cleveland, OH (US);
Abstract
A seal assembly for a valve stem has a primary seal ring with a relatively rigid gland member having an annular base of generally rectangular cross-section and a pair of flexible sealing lips formed in one piece with the base and extending outwardly from one side thereof. The sealing lips define a cavity for an elastomeric expander ring. The expander ring is disposed within the cavity and retained therein by the sealing lips. Each sealing lip has a sealing edge on the outer surface thereof which is pre-loaded against the valve stem and the valve housing when the primary seal ring is installed around the valve stem. Each sealing lip has a flared angle which narrows down to a thickness of between 0.033 and 0.041 inches along the length of the sealing lip between the base and the sealing edge. The expander ring also has a maximum cross-sectional dimension at substantially the midpoint of the expander ring in a direction normal to the central axis of the seal ring which is between 74% and 96% of the nominal cross-section between the valve stem and the valve housing, and each of the sealing lips has a maximum radial dimension about a plane through the midpoint and normal to the central axis which is between 2% and 13% of the nominal cross-section between the valve stem and the valve housing. The primary sealing ring with these dimensions provides enhanced sealability, reliability and dependability.