Valve structure that is buried, extended stem structure, making it suitable for laying of underground pipes installed in places.
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.
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。
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