汚窒素ガス配管上のバルブ
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0.2MPa、205度のDN1200汚染窒素用ガス管には、どのタイプのバタフライバルブを使用するか
この問題の媒体には、金属製の二重偏心を使用できる
温度はやや高く、ハードシール。三偏心。微信13641779936
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