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:
Sep. 12, 1978
Filed:
May. 18, 1977
Kenneth C Simmons, Plainfield, CT (US);
Harry C Champlin, Jr, Ashaway, RI (US);
Carl F Livorsi, Holbrook, MA (US);
Joseph A Wucik, Jr, Westerly, RI (US);
Posi-Seal International, Inc., North Stonington, CT (US);
Abstract
A valve seal mechanism for use in pressurized fluid systems subject to fire risk, the seal having a soft seat to provide essentially zero leakage at normal operating temperatures and a backup hard metal seating surface capable of holding leakage to extremely low rates in the event of temperatures high enough to destroy the soft seat material. The seal mechanism is in the form of a hard metal seal ring adapted to fit within an undercut circumferential groove in a valve seat. The metal seal ring has a central inner circumferential rib adapted to extend through the groove opening for mating engagement with a sealing surface on the circumference of a valve disc. The rib of the metal seal ring itself has a circumferential undercut groove into which is tightly fitted a seal ring of material softer than the metal of the seal ring, the soft seal ring protruding beyond the adjacent inner surface of the rib to provide a primary valve seat surface. If the soft seal ring is destroyed by temperatures exceeding the normal operating range, the rib face provides an undamaged secondary valve seat surface.