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. 08, 1989
Filed:
Aug. 17, 1988
Horace P Halling, Laurel, MD (US);
Robert A Barrett, Crofton, MD (US);
Mark E Woozley, Beltsville, MD (US);
EG&G Pressure Science, Inc., Beltsville, MD (US);
Abstract
A pressure balance sealing ring having a substantially S-shaped, resilient cross section including two oppositely facing convolutions, a central leg coupling the convolutions and a pair of outer legs, each extending from one of the convolutions. The ring is advantageously formed of metal and seals against opposed axially facing but offset surfaces in an annulus between two concentric pipes or opposed axially facing surfaces at the interface formed by two aligned pipes. Each outer leg has a substantially circular sealing line, these sealing lines being radially offset from one another, adjacent the free distal edge of each leg, and spaced from the convolutions. In a modified embodiment, the sealing ring has more than two convolutions and additional legs to connect them. In another series of modified embodiments, the sealing ring has one or two restraining rings rigidly coupled to one or both of the outer legs to ensure the desired direction of torsional deflection under the action of the differential pressure. The sealing ring can also have its sealing lines axially offset as an alternative to them being radially offset.