制御弁のデータシートにある配管規格（Line Size）「57/49」とは何を指すのか
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計装制御弁のデータシートにおいて、配管規格（Line Size）の57/49とは何を意味していますか？
管の外径は57mm、内径は49mmでしょう。
一般的には外径と壁厚のみを記載し、これはあまり標準的ではありません。
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