The ball valve is a kind of pneumatic regulating valve. It is evolved from the cock. Its opening and closing part is a ball. The valve stem is rolled 90 degrees to complete the valve switch. The ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. , The ball valve planned as a V-shaped opening also has a good flow regulating function. Ball valves can open and close quickly, have good sealing, simple structure, low flow resistance, and are widely used in modern industrial occasions.
Pneumatic regulating valve ball valves can be divided into fixed ball valves, floating ball valves, track ball valves, V-shaped ball valves, hemispherical valves, three-way ball valves, four-way ball valves, etc. according to their structural form; according to the connection method, they are divided into flanged ball valves and paired ball valves. Pinch ball valve, internal thread ball valve, external thread ball valve, welded ball valve, clamp ball valve (generally sanitary ball valve), card sleeve ball valve, etc.
According to the sealing material, it can be divided into soft sealing ball valve and metal hard sealing ball valve. Soft-seal ball valves are generally suitable for media with a temperature less than about 150 degrees, and for media above 150 degrees, use PPL or metal seals.
Pneumatic regulating valve small-caliber ball valves generally use floating ball valves and large-caliber ball valves. Because the opening and closing torque required is relatively large, fixed ball valves are often selected, which can reduce the torque required for opening and closing and improve the reliability of the operation. V-shaped ball valves and hemispherical valves can be used to adjust the flow, while three-way ball valves and four-way ball valves are used to reverse the flow.
Commonly used raw materials for ball valves are carbon steel, 304 stainless steel, and 316 stainless steel. For particularly corrosive media, the valve body and the ball are lined with polytetrafluoroethylene. The main driving methods of the ball valve are electric, pneumatic, and worm gear transmission. Small-caliber manual ball valves are generally opened and closed with a handle.
