The structure of the ball valve The ball valve is evolved by the plug valve, and its opening and closing pieces as a sphere, the use of the ball around the axis of the stem rotated 90 degrees to achieve the purpose of opening and closing. The role of the ball valve Ball valve in the pipeline is mainly used to cut off, distribute and change the direction of medium flow, designed as a V-shaped opening of the valve also has a good flow regulating function. The ball valve not only has the advantages of simple structure and good sealing performance, but also has the advantages of small volume, light weight, less material consumption, small installation size, small driving torque, easy operation and quick opening and closing One of the fastest growing valve varieties in more than a decade. Especially in the developed countries such as the United States, Japan, Germany, France, Italy, the West, Britain and other developed countries, the use of ball valves is very wide, the varieties and quantities are still expanding, and to the high temperature, high pressure, large mouth, high sealing, long Life expectancy, excellent regulation performance and multi-functional development of a valve, its reliability and other performance indicators have reached a high level, and has partially replaced the gate valve, globe valve, regulating valve. As the ball valve technology advances, in the foreseeable short-term, especially in the oil and gas pipelines, refinery cracking unit and the nuclear industry will have a wider range of applications. In addition, ball valves will also be one of the leading types of valves in large and medium caliber, medium and low pressure applications in other industries. Ball Valve Advantages 1. Has the lowest flow resistance (virtually zero). 2. Because of its work will not get stuck (in the absence of lubricant), it can be reliably used with corrosive media and low boiling point liquid. 3. In a wide range of pressure and temperature, can be completely sealed. 4. Can achieve fast opening and closing, opening and closing time of some structures only 0.05 ~ 0.1s, to ensure that the test bed can be used in automation systems. Quick opening and closing the valve, the operation without impact. 5. The ball closure can be positioned automatically. 6. The working medium is sealed on both sides reliably. 7. In the fully open and fully closed, the sealing surface of the ball and valve seat and the media isolation, so the high speed through the valve medium will not cause erosion of the sealing surface. Compact, light weight, it can be considered when it is used for low temperature medium system, the most reasonable valve structure. 9. Symmetrical valve body, especially when welded body structure, can well withstand the stress from the pipeline. 10. Closure can withstand the high pressure drop when closed. 11. All-welded ball valve can be buried directly in the ground, so that the valve parts from erosion, the maximum life expectancy of up to 30 years, the oil and gas pipelines the ideal valve. As the ball valve has the above advantages, so a wide range of applications, ball valve can be applied to: 1. Nominal pass from 8mm to 1200mm. 2. Nominal pressure from the vacuum to 42MPa. 3. Operating temperature from -204 ℃ ~ 815 ℃. Search Keyword: More Valve Technical Articles
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