Ball valve (ball valve) came out in in the 1950 of the 20th century, with the rapid development of science and technology, production technology and product structure of continuous improvement, in a short span of 40 years, has developed rapidly into a major valve class. In the western industrialized countries, the use of ball valves is increasing steadily yearly.
In China, the ball valve is widely used in petroleum refining, long-distance pipeline, chemical, papermaking, pharmacy, Water Conservancy, electricity, municipal, steel and other industries, in the national economy occupies a pivotal position. It has a rotating 90 degree of action, the plug body is a sphere, there is circular through holes or channels through its axis.
The ball valve is mainly used in the pipeline to cut, distribute and change the flow direction of the media, it only needs to rotate the operation of 90 degrees and small rotation torque can close tight. The ball valve is most suitable for switching, cut-off valves, V-type ball valves. Electric valves should pay attention to piping parameters, but should pay special attention to their use of environmental conditions, because the electric valve in the electric device is an electromechanical equipment, its use of the State is affected by the environment is very large. In general, the electric ball valve, butterfly valve in the following environmental use to pay special attention.