| 摘要 |
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.
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