nice video sir. can you tell what is the material of seal ring, valve seat, and disc? I want to use a triple eccentric butterfly valve in blast furnace gas line. I am being offered these valves with graphite laminated seal ring while purchase order requirement was of metal-to-metal seating. I am not convinced about these laminated seal rings for bf gas line application. what would you say? my main doubt is why these valve manufacturers claim laminated seal rings to provide metal to metal sealing. as per my understanding graphite will get delaminated in shorter time and also cause galvanic corrosion. thanks again
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