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HFZ47WF型无泄漏燃气平板闸阀
HFZ47WF型无泄漏燃气平板闸阀产品标准API 6D 管道阀门 Pipeline valveJB/T5198-91管线用钢制平板闸阀Steel parallel plate valve for pipeline ANSI B16.5a-1992管法兰管件 Pipe flangesflange pipes JB/T79.1~79.2 管体
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