Using hydraulic valve plunger interior unique structural design, but automatic control timing mechanism transmission gap, transmission lift of CAM change, punctual make and break tire valve.
利用液压挺杆内部独特的结构设计，可自动调节配气机构传动间隙、传递凸轮升程变化、准时开闭气门。
We manufacture the tool joint, make the seal test and make-and-break test.
根据零件图试制双台肩钻具接头，对其进行上卸扣试验和水压密封测试。
We manufacture the tool joint, make the seal test and make-and-break test.
根据零件图试制双台肩钻具接头，对其进行上卸扣试验和水压密封测试。
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