The flange specification of the hard metal sealed butterfly valve (two-way hard to hard all metal hard sealed butterfly valve) overcomes various disadvantages of ordinary triple eccentric multi-layer metal hard sealed butterfly valves. The sealing ring is entirely made of metal material, without any interlayer made of non-metallic materials such as polytetrafluoroethylene, graphite, rubber asbestos board, etc., and will not be damaged by high-speed fluid flushing. The valve is fully or partially open and can adapt to high temperature (<800C), low temperature (-196 ℃), and high pressure (PN160)
