Ordinary eccentric rotary valve body is made up of long neck clamp body, bow sphere or hemisphere guanqiu postures of disc, seat retainer, the valve stem ( Main, auxiliary shaft) And guide sleeve and packing, etc. Between parts monotonous species, different specifications do not standardization, seriation, modularization, simple combination of parts. According to the concept of 'valve' put forward by the conception and idea, concept of eccentric rotary valve for sealing performance requirements or conditions on the material, etc. , the influence of the valve for main components in the design of packet classification, establish product modular library again according to the different requirements of product characteristics to establish parts module library. Due to the eccentric rotary valve is made up of eccentric disc turn adjusting and cut off the medium, taking advantages of the ball valve and butterfly Industrial Valves. Its small amount of leakage and can double as cut-off valve, adjustable than the big, small volume, light quality, flow coefficient, dynamic stability is high, the valve effect ( General valve in the critical point flow characteristic curve distortion will occur, this phenomenon is called valve effect) Smaller (unbalanced force is not obvious, the disc About 1/2 of single seat valve) Wide temperature, high universality. If you want to change the same specifications of the valve flow capacity, the need to replace the seat, don't need to change the disc. Simple easy to coat lining inside the valve cavity structure, to adapt to the needs of different medium. The valve comprehensive performance is superior, can substitute for the regulator, especially suitable for wide range to adjust requirements ( It can be instead of one large - at this time D, two parallel of the relatively small adjustable valve, so that the control system and the simplified) The operation condition of the flow capacity is big, small resistance. Such as in the coal-fired power plant deaerator heating steam control valve and the main condensate regulator and high viscosity medium ( Such as heavy oil) And so on. Concept of eccentric rotating valve need further study and solve the problems and are likely to make important progress in several aspects. ( 1) Eccentric rotary valve sealing structure of the sealing elements in computer aided design is the content of further research. Frictionless contact seal eccentric rotary valve, self-reliance type eccentric rotary valve, air tight level of eccentric rotating valve structure still need further research. ( 2) Ceramics, high hardness, high temperature alloy coating and application of new composite materials research and development still need further. ( 3) The dynamic process of eccentric rotating valve and other valve numerical calculation still need to further strengthen. High-temperature smoke media, steam medium, pulp, such as silt medium numerical calculation method and technology in the application of the valve will greatly improves the performance of the valve, reduce the development cost. To shorten the development cycle. ( 4) High frequency, long life, high load of pneumatic actuators and more defects, to improve. Intelligent type electric quarter-turn actuators is present and the future research focus. The research and development of new type bus locator is the main way to improve precision of the pneumatic actuators. ( 5) Ceramics, high hardness, high temperature alloy after spraying and the application of composite materials and processing technology and ability also to be improved. ( 6) Fire type, low temperature, super high temperature, high pressure and corrosion resistance to abrasion of the application and the potential market development and promotion. In this paper, the keyword search: the valve
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