Flange gaskets are not interchangeable with other mechanical pipe couplings or flange gaskets.
法兰垫圈与其它机械管道连接器或法兰垫圈互换。
Made up of oil expanding type or water expanding type expandable elastomer material, mechanical pipe string, centralizer and etc.
由油胀式或水胀式可膨胀弹性体材料与机械管柱、扶正器等构成。
Most of the pipe threads manufacturing equipments are mechanical ones with the same structures and function in China.
在国内，油管加工设备多数是机械式车床，结构和功能相同。
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