double-acting shock absorber
... double-acting relay ==> 双侧作用继动器 double-acting shock absorber ==> 双向减震器 double-acting steam engine ==> 双动式蒸汽机 ...
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SJ型双向减震器是一种能同时减速缓或消除钻柱纵向和周向振动的双向减震工具。
The SJ type double way bumper is a kind of double-way shock absorbing tool which is used to simultaneously slow down or eliminate the vertically or horizontally shock from drill string.
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