1、使用特性。它确定了阀门的主要使用性能和使用范围。属于阀门使用特性的有：
1. Use properties. It determines the main performance and scope of use of the valve. The service characteristics of valves include:
阀门的类别(闭路阀门、调节阀门、阀门等)；
Type of valve (closed-circuit valve, regulating valve, valve, etc.);
产品类型(闸阀、截止阀、蝶阀、球阀等)；
Product type (gate valve, globe valve, butterfly valve, ball valve, etc.);
阀门主要零件(阀体、阀盖、阀杆、阀瓣、密封面)的材料；
Materials of main parts of the valve (valve body, bonnet, valve rod, valve disc and sealing surface);
阀门传动方式等。
Valve transmission mode, etc.
2、结构特性。它确定了阀门的安装、维修、保养等方法的一些结构特征。属于结构特征的有：
2. Structural properties. It determines some structural features of valve installation, repair, maintenance and other methods. Structural features include:
阀门的结构长度和总体高度、与管道的连接形式(法兰连接、螺纹连接、夹箍连接、外螺纹连接、焊接端连接等)；
The structural length and overall height of the valve, and the connection form with the pipeline (flange connection, threaded connection, clamp connection, external thread connection, welded end connection, etc.);
密封面的形式(镶圈、螺纹圈、堆焊、喷焊、阀体本身加工出);
Form of sealing surface (insert ring, threaded ring, surfacing, spray welding, and processed by the valve body itself);
阀杆结构形式(旋转杆、升降杆)等。
Valve stem structure (rotating rod, lifting rod), etc.
在某些情况下使用特性和结构特性是相互联系的，是不能截然分开的
In some cases, service characteristics and structural characteristics are interrelated and cannot be completely separated
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