静密封用台形溝の規格についてご教示ください
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垂直型の固定管板式熱交換器で、管箱フランジと管板フランジの間はOリングで密封され、台形の溝が必要です。台形溝の内径は740。台形溝に対応する規格を教えてください。
GBT3452.3-2005（油圧・空気圧用Oリング－溝寸法）。これでしょう
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