介绍了这种油管钳的结构特点和工作原理。
The design feature and working principle of the new tongs are introduced.
本文介绍新型DQ130液电动力油管钳的结构，工作原理、性能参数和现场试验使用情况。
In this paper, the authors introduce the design, fundamental principle, performance data and test results of a DQ130 new type hydroelectric tubing power tong.
液压油管钳扭矩控制阀用于油管和抽油杆上螺纹时控制其扭矩值 ，以免扭矩过大而损坏螺纹或造成本体变形。
The torque control valve of hydraulic tong is developed to protect the scrws of tube and suck rod from being damaged or deformed caused by over tightness.
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