주철 볼밸브가 열리지 않을 때 어떻게 처리하나요?
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최근 몇 년간 일부 공정에서는 주철 볼밸브를 거의 사용하지 않지만, 가끔 사용해야 할 때 제대로 열리지 않는 경우가 있습니다. 이런 밸브는 어떻게 관리해야 할까요?
어떤 세척제를 넣나요?세척액을 넣는 역할은 무엇인가요?어디에 주유하나요?
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