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ダブルプレート式逆止弁の固定ピンなし設計とはどのようなものですか?

2016-11-15View Original

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規定を見ると、可燃性媒体用の二板式逆止弁は「固定栓なし」の設計であるか、またはシール溶接されたねじ式の固定栓を備えるべきだと書かれていますが、その「固定栓なし」とはどのような構造なのでしょうか?知ってる人いますか?これを行う目的は、固定栓を取り付ける場所で不必要な漏れが起こるのを防ぐためですか?

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