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We select high quality special valve bar material, such as: 4Cr9Si2, 4Cr10Si2Mo, 21-4N, X60, X80, 21-4NWNb Etc. The production use connection processing line, heat treatment with network continuous furnace, welding of double metals, valve seat welding (STELI), U-type quenching for valve rod slot, chrome plating and soft nitriding on surface, all of these can ensure the excellent quality and reliability of our products.