バルブの英語の米国規格とは何ですか
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シール付き完全防火ポートWR OP
まず、これは推測に過ぎず、正確であるとは保証しません。P：シール、SEALS：密封、FULL PORT：全通径、FIRE SAFE：防火、WR：溶接、OP：手動操作
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