... hydraulic retraction system 液压进退系统 hydraulic rod tong 液压抽油杆钳 hydraulic rope-geared elevator 液压绳索升降机 ...
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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.
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。
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