1. Use properties. It determines the main performance and scope of use of the valve. The service characteristics of valves include:

閥門的類別(閉路閥門、調節閥門、安全閥門等)；

Type of valve (closed-circuit valve, regulating valve, safety valve, etc.);

產品類型(閘閥、截止閥、蝶閥、球閥等)；

Product type (gate valve, globe valve, butterfly valve, ball valve, etc.);

閥門主要零件(閥體、閥蓋、閥桿、閥瓣、密封面)的材料；

Materials of main parts of the valve (valve body, bonnet, stem, disc, sealing surface);

閥門傳動方式等。

Valve transmission mode, etc.

2、結構特性。它確定了閥門的安裝、維修、保養等方法的一些結構特征。屬于結構特征的有：

2. Structural characteristics. It determines some structural features of the installation, maintenance and other methods of the valve. The structural features are:

閥門的結構長度和總體高度、與管道的連接形式(法蘭連接、螺紋連接、夾箍連接、外螺紋連接、焊接端連接等)；

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(鑲圈、螺紋圈、堆焊、噴焊、閥體本身加工出);

Form of sealing surface (insert ring, threaded ring, surfacing, spray welding, processed by the valve body itself);

閥桿結構形式(旋轉桿、升降桿)等。

Valve stem structure (rotating rod, lifting rod), etc.

在某些情況下使用特性和結構特性是相互聯系的，是不能截然分開的。

In some cases, the use characteristics and structural characteristics are interrelated and cannot be completely separated.

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