The HSC-A Hydraulic Stage Cementer features inner closing structure, opening through pressure difference. The closing plug drives the closing sleeve down and then shut circulation ports.
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释义
型压差式双级注水泥器为内关闭式结构,不需投重力塞,通过液体的压力差打开循环孔,关闭塞带动关闭套下行关闭循环孔。
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