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.

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.

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.

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.

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

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

3. It can open and close quickly;

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

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

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

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

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

3. It can be used for large diameter valves;

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

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.