液压扳手的使用范围广泛；在船舶工程，石油化工，风电，水电，热电，矿山，机械，钢厂，橡胶，管道等行业的施工，检修，抢修等工作中，液压扭矩扳手对于大规格的螺栓的安装与拆卸都是一种较为重要的工具；有其它工具的不可替代性，不仅使用方便，而且所提供的扭矩非常精准，扭矩重复精度达到3%左右。
The hydraulic wrench is widely used; in the construction, overhaul and rush repair of shipbuilding, petrochemical, wind power, hydropower, thermoelectricity, mining, machinery, steel plant, rubber, pipeline and other industries, the hydraulic torque wrench is an important tool for the installation and disassembly of large-scale bolts; there are irreplaceable other tools, not only convenient to use, but also The torque provided is very accurate, and the torque repetition accuracy is about 3%.
液压扳手选购应注意哪些？
What should be paid attention to when choosing hydraulic wrench?
①螺栓大小
① Bolt size
通常有好几种螺栓，公制或者是英制的，同种公制的螺栓，选用同种型号的液压扳手，当螺栓规格跨度较大的时候，预紧螺栓时就要选用多种型号的扳手。
There are usually several kinds of bolts, metric or English, metric bolts of the same type, and hydraulic wrenches of the same type are selected. When the bolt specification span is large, multiple types of wrenches should be selected when pre tightening the bolts.
②扭矩要求
② Torque requirements
螺栓的规格、螺栓的强度等级是液压扭矩扳手选型的更关键参数。螺栓不同，扭矩不同，同样的螺栓强度等级不同扭矩不同，同样螺栓强度等级，不同工况的扭矩也不同。
The specification and strength grade of bolts are the most important parameters for the selection of hydraulic torque wrench. Different bolt, different torque, the same bolt strength level, different torque, the same bolt strength level, different torque under different working conditions.
③螺栓螺母空间位置
③ Space position of bolt and nut
如果没有空间限制，哪个型号的扳手都可以使用；驱动式液压扳手更为通用；如螺栓拧好后露出的螺纹较长或者螺栓上面有空间有限，更好使用中空式液压扳手；如螺母间距离狭窄，可选用中空式液压扳手。
If there is no space limit, any type of wrench can be used; the driving hydraulic wrench is the most universal; if the thread exposed after the bolt is screwed is long or there is limited space on the bolt, it is better to use the hollow hydraulic wrench; if the distance between the nuts is narrow, the hollow hydraulic wrench can be selected.
