Ball valve is in the 50 s of this century of a new type of valve. In just 30 years, is one of the valves varieties developed rapidly in last decade. Especially in the United States, Germany, Japan, France, Italy, and west, Britain and other developed countries, the ball valve has a very wide range of USES, use of variety and quantity continues to expand, and to high temperature and high pressure, big, high sealing, long life, good regulation performance, and a multifunctional direction valve, its reliability and other performance indicators have reached a higher level, and has set up a part replace gate valve, cut-off valve, throttle valve. It in aerospace, petrochemical industry, long distance pipeline, light industry, food, architecture, etc are widely used in many ways. Ball ball valve with a circular hole as opening and closing, the sphere with the Industrial Valves rod rotation, in order to realize the on-off movement. ball valve. Ball valve evolved by the plug valve, also known as ball cock valve. Ball valve opening and closing as a sphere, using sphere rotates 90 degrees around the axis of the stem to achieve the purpose of opening and closing. Ball valve in the line is mainly used for cutting, distribution, and change the flow direction of medium, the design into a v-shaped opening ball valve has a good flow regulating function. Ball valve just has to rotate 90 degrees operation and small rotational torque can be closed tight. Full equality of the valve body cavity for medium resistance is very small, straight flow channel. Ball valve is not only simple structure, good sealing performance, and within a certain range of nominal pass after small volume, light weight, less material consumption, installation size is small, and the drive torque is small, easy to operate, easy to realize the rapid opening and closing, easy operation and maintenance, applicable to water, solvent, acid and gas, such as general work medium, but also is suitable for the working conditions of media, such as oxygen, hydrogen peroxide, methane and ethylene. Ball valve body can be a whole, also can be combined. Why can ball Industrial Valves in the aerospace, petrochemical, long distance pipeline, light industry, food, construction and many other aspects are widely used? This is because the ball valve compared with other types of valve, has many outstanding advantages. The main characteristic of ball valve is as follows: 1. Ball valve fluid resistance small, with low flow resistance ( In fact is zero) : ball valves are reducing and generally not reducing channel two structures. No matter the structure, the flow resistance coefficient of ball valve is smaller. Especially the so-called full flow type, i. e. , not reducing ball valve, due to its channel diameter equal to the inner diameter pipeline, local resistance loss only equivalent length of pipe friction resistance, namely in all valves, the ball valve flow resistance is small. In rocket and its experimental system, the requirements of pipeline resistance as small as possible. There are two ways to reduce the resistance of piping system: one is to reduce the fluid velocity, therefore need to increase diameter and valve size, for the efficiency of pipeline system tends to produce adverse effect, especially for conveying system at low temperature ( Liquid hydrogen) Is a very bad; One is reduce the local resistance of the valve, therefore, ball valves have naturally become zui preferred choice. 2, ball valve open/close switch, convenient quickly, since only the ball valve in the general case rotates 90 ° completes the fully open or close the action, it is easy to realize rapid opening and closing. Can realize the rapid opening and closing, some of the structure of the opening and closing time is only 0. 05 ~ 0. 1 s to ensure that can be used to test the automation system. Quick opening and closing valves, no impact on the operation. 3, ball valve sealing performance is good: at present, most of the ball valve seat is made of elastic material such as ptfe, sealing pair of metallic and non-metallic materials, often referred to as soft seal. In general, soft seal sealing easy to guarantee, and the machining accuracy and surface roughness on the surface of the sealing requirement is not high. 4, ball valve, long service life: because of ptfe have good self-lubrication, with small sphere of friction and wear, and because the ball processing technology improvements, reduce roughness, thus improve the service life of the ball valve. 5, ball valve, high reliability is mainly due to: (1) a sphere with a pair of seating vice will not occur scratches, sharp and wear failure, not stuck at work ( In the absence of lubricant) , so it can be reliably applied with the corrosive medium and low boiling point liquid; (2) built in stem structure, eliminates the stem under the effect of fluid pressure may be due to the packing gland to loosen and fly out of accident hidden danger; (3) using anti-static, fire-proof structure of ball valve, is suitable for conveying petroleum, natural gas, coal gas pipeline.
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