motion of drill pump valve 钻井泵阀运动
Practice proves the testing accuracy of the displacement and motion Pattem of the drill pump valve me...
实践表明，泵阀位移及运动规律的测试精度能满足理论分析的要求。
Test shows that the service life of the drill pump valve and liner after carburizing and vanadiumizing are greatly extended.
试验表明，钻井泵泵阀和缸套经增碳-钒化处理后其使用寿命显著延长。
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