The Study On Reducing And Similarity Of Butterfly Valve

In the industrial areas civilian facilities, there are so many fluid circulation systems can be seen everywhere. Such as steel, electricity, heating, coal, chemicals in the industrial areas. In the civilian facilities, central air conditioners and central heating water systems are typical applications of fluid circulation systems. In all of the water circulation system, the control valve is the most critical components. Therefore, the design and development of the control valve is of great significance.In this paper, we mainly focus on the application of butterfly valve in the fluid lines for the water system. Research mainly includes the reducing installation of the valve KVS and the method of butterfly valve design by similarity theory. And, we combined theoretical analysis, numerical calculation and experimental research methods, the results show that the article proposed method is feasible.The first aspect:the influence of reducing installation of the valve. Reducing installation is often used in practical engineering applications. The installation is often accompanied by the phenomena that tapered valve flow capacity is lower than the actual nominal flow capacity of the valve. In this paper, we perform a study of this phenomenon to found the problem. By SIMPLE algorithm of CFD methods. DN125 butterfly valves which are installed in four different diameters has been calculated. Then, we obtain the values of their KVS. And to calculate the results for the samples, we propose amendment function of adjustable compensation factor.The second aspect:the similarity criteria design of butterfly valve. In this paper, innovation similar design of large diameter butterfly valve was proposed by using the similarity principle of fluid machinery. Take DN200 and DN40 linear flow valve for example, we describe similar design criteria. First, we design the DN40 linear flow valve model and get its flow characteristics by the numerical calculation; then, we find the flow characteristics of the prototype based on similarity criteria method that has been deduced; then, we obtain the flow characteristics of the enlarged model by numerical simulation and preliminary verification of the accuracy of the similarity of design is finished. Finally, experimental results verify the feasibility of similar design criteria.