History of the development of butterfly

The structural characteristics of butterfly valves for the stem axis, butterfly plate center, the Center in the same body position. Simple structure, convenient manufacture. Rubber lining butterfly valve that is commonly fall into this category. The disadvantage is that as a result of butterfly valve plate and extrusion remains, scratch, and resistance from the large, fast wear and tear. To overcome the squeeze, scratch, to ensure the sealing performance, the use of seat basically rubber or elastic material such as PTFE, but also result in the use of restrictions by the temperature, which is why people traditionally do not believe that high temperature valves reasons.      Second, a single eccentric butterfly valve      To resolve the concentric butterfly valve butterfly valve seat plate and the problem of extrusion, the resulting single eccentric butterfly valve, and its structure characterized by a departure from the stem axis center butterfly plate, so that the bottom plate would no longer be a butterfly rotary heart, scattered, reducing the butterfly valve seat on the board over the bottom and squeeze. However, due to a single eccentric valve structure in the course of the entire switch butterfly valve seat plate and the scratch is not disappeared, in the application scope and concentric butterfly valve more or less the same, so the use of small.      Third, double eccentric butterfly valve      In a single eccentric butterfly valve forming the basis of further improvement is currently the most widely used double eccentric butterfly valve. Structural characteristics of its stem axis in both panels deviate from the Butterfly Center, the Center has also deviated from the body. So that the effect of double eccentric valve was opened immediately after the butterfly plate from the valve seat to substantially eliminate the butterfly valve plate and the unnecessary over-extrusion, scratch phenomenon, to reduce resistance from the open and reduce the wear and tear, increased life expectancy seat. A significant reduction in the scratch, but also makes double eccentric butterfly valve metal valve seat can also be used to enhance the area of the butterfly valve in the high-temperature applications. However, because of its location is an enclosed sealed structure principle, that is, butterfly valve seat plate and the sealing surface for line contact plate squeeze through the butterfly valve seat caused by the effect of elastic deformation generated seal, it demanding the closure of the location (especially metal seat), low pressure, which is why people traditionally believe that intolerance of high pressure valves, a large quantity of the reasons for the leakage.

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