API 6D 소프트 씰 볼밸브는 어떤 테스트를 합니까?
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API 6D 소프트 실링 볼밸브는 607과 6Fa 두 가지 방화 시험을 해야 합니까?
방화 시험을 해야 하는지는 매체 조건을 참고해야 합니다!
둘 다 할까?아니면 마음대로 고르나요?, 여전히 우선 선택인가?
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