Ball cock evolved from its opening and closing parts as a sphere, the use of ball valve around the stem axis of rotation 90dgree to achieve the purpose of opening and closing. Valve in the pipeline is mainly used for cutting, distribution and change the direction of media flow, the design of the ball into the V-shaped openings also has a good flow regulation.

Ball is not only a simple structure, good sealing performance, but also in a certain range of nominal by the smaller, light weight, low consumption of materials, installation size, small, and the driving torque is small, simple, easy to open and close fast, the ball valve is the last decade one of the fastest-growing varieties of the valve. Especially in the United States, Japan, Germany, France, Italy, Spain, Britain and other industrialized countries, the valve is widely used, the use of the variety and quantity continues to expand, to the high temperature, high pressure, big mouth by high tightness, long life, excellent performance and adjust the direction of a valve function, its reliability and other performance indicators have reached a higher level and has partially replaced gate valve,globe valve, throttle valve.

With the ball valve advances in technology, in the foreseeable short-term, see, in particular in the oil and gas pipelines, oil refining and nuclear industry on a cracker will have a wider range of applications. In addition, other large and medium-caliber industry, in areas of low pressure, valve will also be one of the leading ball valve types.

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