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:
Aug. 07, 1979
Filed:
Nov. 10, 1977
Applicant:
Inventors:
James M Fowler, Missouri City, TX (US);
Bertram L Morrison, Houston, TX (US);
Assignee:
ACF Industries, Incorporated, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ; F16K / ;
U.S. Cl.
CPC ...
251328 ; 251315 ; 251364 ;
Abstract
A valve seal includes inner and outer concentric seal rings located side by side in a groove with the inner seal ring against the groove inner wall and the outer seal ring against the groove outer wall. Interfitting surfaces are provided on the seal rings to hold them together and prevent longitudinal movement between them. The groove and the seal rings cooperate to hold the seal rings in the groove. One of the seal rings is relatively soft and has good low pressure sealing characteristics while the other seal ring is relatively hard and has good high pressure sealing characteristics.