球阀埋地结构即，加长阀杆结构，使其适用于管线埋地铺设安装的场所。
Valve structure that is buried, extended stem structure, making it suitable for laying of underground pipes installed in places.
CPVC封装的阀杆加长件并不用于水平球阀系列。
CPVC housed stem extensions are not intended for the horizon ball valve series.
低温设备仪表在线阀门的阀帽和填料箱应为加长阀帽型或伴热型(必要时)，从而避免阀杆结冰。
The bonnet and packing box of low temperature service instrument in-line valves shall be extended bonnet type or heat traced, if necessary, to avoid freezing of valve stems.
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