球阀的工作原理（The working principle of ball valve）.docVIP

球阀的工作原理（The working principle of ball valve） detailed information Ball valve structure Ball valve is evolved from the plug valve, and its opening and closing parts as a sphere, using the ball around the axis of the stem rotation 90 degrees, to achieve the purpose of opening and closing. Ball valve role Ball valve in the pipeline is mainly used for cutting, distribution and change the direction of media flow, designed to V shaped opening of the ball valve, also has a good flow adjustment function. The ball valve has the advantages of simple structure, good sealing performance, but also in a certain range of nominal by small volume, light weight, less consumption of materials, installation of small size, and the driving torque is small, simple and easy to achieve rapid opening and closing, the valve is one of the fastest growing variety in recent ten years. Especially in the United States, Japan, Germany, Italy, France, Britain and other western developed countries, the valve is widely used, the use of variety and quantity continues to expand, and to the high temperature and high pressure, large caliber, 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 been partially replaced by gate valve, globe valve, regulating valve. With the development of ball valves technology, it will be widely used in the foreseeable short term, especially in oil and gas pipelines, oil refining cracking devices and nuclear industry. In addition, in other industries of large and medium-sized caliber, low pressure field, ball valve will also become one of the leading types of valves. Advantages of ball valves 1. has the lowest flow resistance (practically zero). 2. because it is not stuck at work (without lubricant), it can be reliably applied to corrosive medium and low boiling liquid. 3. complete seal can be achieved in larger pressure and temperature range. 4.,