What is the difference between ball Valve and butterfly Valve

Ball valve and butterfly valve are two important categories of valves, which are widely used. Ball valve in high temperature and high pressure require strict sealing, flow resistance to small conditions. Butterfly valve is mainly used for low pressure, sealing requirements are not high, the classification of ball valve and butterfly valve is also more.

球阀可分为：金属硬密封球阀、软密封球阀、浮动球球阀、固定球球阀、偏心半球阀、V型调节球阀等。

Ball valve can be divided into: metal hard seal ball valve, soft seal ball valve, floating ball valve, fixed ball valve, eccentric hemisphere valve, V-type regulating ball valve, etc.

蝶阀分为：三偏心蝶阀、双偏心蝶阀、中线蝶阀、硬密封蝶阀、软密封蝶阀。

Butterfly valve is divided into three eccentric butterfly valve, double eccentric butterfly valve, center line butterfly valve, hard seal butterfly valve and soft seal butterfly valve.

球阀和蝶阀都是常用的阀门，有些场合两者可以通用的，而有些工况又只能使用其中的一种的。这两种阀的各有自己的特点。

Ball valve and butterfly valve are commonly used valves, some occasions both can be universal, and some conditions can only use one of them. Each valve has its own characteristics.

球阀：旋塞阀演变而来，启闭件是球体，特点是：

Ball valve: evolved from the plug valve, the opening and closing part is a ball, characterized by:

1、流通阻力小，全开时，通道内没有阻挡介质流动的部件；

1. The flow resistance is small. When the channel is fully open, there is no part blocking the flow of medium in the channel;

2、在较大的压力和较高温度下，可实现完全密封；

2. Under high pressure and high temperature, complete sealing can be achieved;

3、可快速启闭；

3. It can open and close quickly;

4、通过做硬化处理，实现高耐磨、耐强腐蚀；

4. Through hardening treatment, high wear resistance and strong corrosion resistance are realized;

5、阀体对称，可以有效承受管道压力，可应付高压工况。

5. The valve body is symmetrical, which can effectively bear pipeline pressure and cope with high pressure conditions.

蝶阀：启闭件是圆盘式蝶板，特点是：

Butterfly valve: the opening and closing parts are disc type butterfly plates, which are characterized by:

1、结构简单、体积小、安装方便；

1. It has the advantages of simple structure, small volume and convenient installation;

2、流阻系数小，启闭迅速；

2. Small flow resistance coefficient and quick opening and closing;

3、可用于大口径阀门；

3. It can be used for large diameter valves;

4、可应用不同的密封面，使用各种环境，包括粉状、颗粒状介质等。

4. It can be used in different sealing surfaces and various environments, including powdery and granular media.

蝶阀相对于球阀，密封性稍差，但大口径阀门中，蝶阀比球阀要具有得天独厚的优势；当做调节流量用时，蝶阀调节范围不大，而V型调节球阀，调节。在高压管路中，球阀要比蝶阀具有优势。

Compared with ball valve, butterfly valve has poor sealing performance, but in large-diameter valves, butterfly valve has unique advantages over ball valve; When it is used to regulate the flow, the butterfly valve has a small regulating range, while the V-type regulating ball valve has a small regulating range. In high pressure pipeline, ball valve has advantages over butterfly valve.