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. 02, 1987
Filed:
Oct. 01, 1985
Applicant:
Inventors:
Jack G Sundberg, Meriden, CT (US);
Andrew Gahura, Winstead, CT (US);
Assignee:
Colt Industries Inc., New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16J / ; F16J / ; F16J / ;
U.S. Cl.
CPC ...
277-1 ; 277-2 ; 277 27 ; 277 38 ; 277 40 ; 277 70 ; 277 85 ;
Abstract
A shaft seal assembly 10 for a high speed centrifugal pump has a primary seal (30) and a secondary seal (32). During normal operation the primary seal has its nose (38) in firm engagement with a seal face (28) and the secondary seal has its nose (42) in light engagement with the seal face. Upon failure of the primary seal, the nose of the secondary seal is urged into firm engagement with the seal face. An orifice (58) in the nose of the secondary seal allows for controlled leakage which indicates primary seal failure.