For the larger ball valves, as well as all butterfly valves, the appropriate butterfly valve handle and index plate are supplied for manual operation of the stem extensions.

 
  • 對于更大的球閥,以及所有蝶閥,可提供適當的蝶閥手柄和刻度板,用于閥桿加長(cháng)件的手動(dòng)操作。
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