異径逆止弁規格
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異径逆止弁はどの基準に従っているのでしょうか？国産のバルブはどれも等径のようです
異径逆止弁を選定されるにあたり、特別なご考慮はありますか？
逆止弁には異径という言葉はないようですね
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