Fire safe seal
AssigneeGrove Valve and Regulator Company
InventorRoger L. Ripert
Life of this patent
Estimating the term…
Abstract
A fire-safe seal for a valve having a metallic seat ring with a resilient seal ring in a leading face thereof to seal against a valve closure member. A thin, metallic flexible diaphragm is clamped around its outer edges to the body and around its inner edge to the seat ring. An annular sealing ridge, which is concentric to and smaller than the resilient seal, is provided around the face of the seat ring to provide a metal-to-metal seal in the event of destruction of the resilient seal.
Claims6
In a valve having a valve body, a closure member mounted in said body for movement between open and closed positions, an internal cylindrical surface in said body adjacent to said closure member, a metallic seat ring slidable in said internal surface, an annular recess in the leading face of said seat ring, a resilient seal ring in and protruding from said recess to seal off fluid flow when urged against said closure member and biasing means urging said seat ring against said closure member;
- a fire safe seal comprising:
- a thin, flexible, annular metallic diaphragm sealed at its outer periphery to said body and at its inner edge to said seat ring;
- said diaphragm being interposed between said seat ring and said biasing means;
- and
- a narrow metallic annular sealing ridge integral with and around the leading face of said seat ring within the area circumscribed by said annular recess.
- said sealing ridge protruding from said leading face so as to engage against said closure member in absence of said sealing ring while a clearance remains between said closure member and the remainder of said leading face.
Dependencies are inferred from the claim text.