The ball valve is mainly used to cut off, distribute and change the flow direction of the medium on the pipeline. The ball valve designed with a V-shaped opening also has a good flow regulation function.
Advantages of ball valves
1. Small fluid resistance, its resistance coefficient is equal to that of the pipe section of the same length;
2. Simple structure, small size and light weight;
3. Tight and reliable. At present, the sealing surface material of ball valves is widely made of plastic, which has good sealing performance and has been widely used in vacuum systems;
4. Easy to operate, quick opening and closing, only need to rotate 90° from full open to full closed, which is convenient for long-distance control;
5. Easy maintenance, the ball valve has a simple structure, and the sealing ring is generally movable, which is convenient for disassembly and replacement;
6. When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, and the medium will not cause erosion of the valve sealing surface when passing;
7. Wide range of applications, diameters range from a few millimeters to several meters, and can be used from high vacuum to high pressure.
Applicable occasions of ball valves
The many unique characteristics of ball valves determine that the application occasions of ball valves are relatively wide. Generally, ball valves are recommended for piping systems with two-position adjustment, strict sealing performance, mud, wear, shrinkage channel, rapid opening and closing action (1/4 turn opening and closing), high pressure cutoff (large pressure difference), low noise, cavitation and gasification phenomenon, small leakage to the atmosphere, small operating torque, and small fluid resistance.
Ball valves are also suitable for piping systems with light structure, low pressure cutoff (small pressure difference), and corrosive media. Ball valves can also be used in low temperature (deep cold) devices and piping systems. In the oxygen piping system of the metallurgical industry, ball valves that have been strictly degreased must be used. When the main pipeline in the oil pipeline and gas pipeline needs to be buried underground, a full-bore welded ball valve must be used. When the adjustment performance is required, a ball valve with a special structure with a V-shaped opening must be selected. In petroleum, petrochemical, chemical, electric power, and urban construction, metal-to-metal sealed ball valves can be selected for piping systems with working temperatures above 200 degrees.
