DN300のダクトに閉止バルブを取り付ける場合、どのようなバルブが適しているでしょうか？
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どのバルブが良いですか？PID図に描きたいです。。 機能はスイッチです。
中央線式のバルブで十分です。必ずしも三偏心式を使う必要はなく、そうすれば安上がりです
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