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.
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.
对于用在所有球阀上的阀杆加长件，应该采用29240018齿轮操作机构和29241014驱动套管。