... 拉制管 solid drawn tube 整体凸缘 solid flange 实锻，实锻件 solid forging ...
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It has a solid one-piece PTFE liner that extends over the raised face portion of the flange face to serve as the gasket.
阀体法兰突面上有聚四氟乙烯实体起垫片的作用。
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