Ball valves and butterfly valves are commonly used valves. Some situations can be universal, while some working conditions can only use one of them. The main difference between the two lies in their construction and switching principles.
1、 Ball valve: evolved from plug valve, with a spherical opening and closing component. The characteristics are:
1. Low fluid resistance, full bore ball valves have no flow resistance at all.
2. Simple structure, small size, and light weight.
3. Tight and reliable. It has two sealing surfaces, and now various plastics are widely used for the sealing surfaces of ball valves, which have good sealing performance and can complete * sealing. It has also been widely used in vacuum systems.
4. Easy to operate, agile opening and closing, only need to rotate 90 ° from fully open to fully closed, making it convenient for long-distance control.
5. Easy to repair, ball valve structure is simple, and sealing rings are usually movable, making disassembly and replacement relatively convenient.
When fully open or fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium, and when the medium passes through, it will not cause corrosion of the valve sealing surface.
7. It has a wide range of applications, with diameters ranging from a few millimeters to several meters, and can be used from high vacuum to high pressure.
8. Because ball valves have scrubbing properties during opening and closing, they can be used in media with suspended solid particles.
2、 Butterfly valve: The opening and closing components are disc-shaped and open, characterized by:
1. Simple construction, small size, and convenient installation;
2. Small flow resistance coefficient, agile opening and closing,;
3. Can be used for large-diameter valves;
4. Different sealing surfaces can be used in various environments, including powder and granular media;
5. Convenient and agile opening and closing, labor-saving, low fluid resistance, and can be operated frequently.
6. It can transport mud and accumulate liquid at the pipeline mouth at least.
7. Under low pressure, it can achieve outstanding sealing.
8. Good conditioning performance.
3、 Valve Summary
Compared to ball valves, butterfly valves have slightly poorer sealing performance, but among large-diameter valves, butterfly valves have unique advantages over ball valves; When used for regulating flow, butterfly valves have a small scale of regulation, while V-shaped regulating ball valves are used for regulation. Additionally, in high-pressure pipelines, ball valves have advantages over butterfly valves.