En la década de 1930, los americanos inventaron la válvula de mariposa, y luego se introdujo en Japón en la década de 1950., y fue ampliamente adoptado en Japón en la década de 1960., y fue promovido en China en la década de 1970. Although China began to invest in research and production in the field of butterfly valves is not very early, but the speed of development is very high, and the results of development are also very rich. At the beginning, the butterfly valve mechanism is basically based on the middle line butterfly valve, with the improvement of the process and the butterfly valve has been widely used in various fields of the industry, which also makes the demand for the butterfly valve in the industry increased: high temperature resistance, high performance and so on. Demand driven creation, through the efforts of Chinese manufacturers, the performance of the butterfly valve has been further improved, creating a wider range of temperature and pressure, rendimiento de sellado confiable, and longer service life of the butterfly valve. Válvula de mariposa doble excéntrica is improved on the basis of single eccentric.
As China’s current first-class double eccentric butterfly valve manufacturer, today TWT wants to talk about double eccentric butterfly valve in detail.
Double eccentric butterfly valves’ improvement process
In order to solve the problem of squeezing the butterfly plate and the seat of the concentric butterfly valve, a single eccentric butterfly valve is first produced, and its structural characteristics are: the stem axis deviates from the center of the butterfly plate. Although this improvement reduces the friction to a certain extent, but the effect is not much better, double eccentric butterfly valve is further improved on the basis of the single eccentric butterfly valve, is currently more widely used butterfly valve, its structural characteristics are: the stem axis deviates from the center of the butterfly plate, but also deviates from the center of the body.
This improvement of the double eccentric butterfly valve greatly eliminates the unnecessary excessive extrusion and scraping phenomenon of the butterfly plate and the seat, reduce la resistencia a la apertura, reduces the wear, and improves the life of the seat, so the double eccentric butterfly valve is called a high-performance butterfly valve.
Válvula de mariposa doble excéntrica’s working mode
Double offset high performance butterfly valve is mainly composed of valve body, valve plate, valve core, asiento de válvula, valve cover, support rod, shaft head, cover, detector, gasket body and other components.In normal operation, the pressure between the two outlets of the valve body is very small, when the fluid flows, the valve will automatically open to let the fluid flow through; When the fluid is stopped, the valve automatically closes, blocking the fluid flow.
Material of double eccentric butterfly valve
Double eccentric butterfly valves can also use metal seats, which improves the application of butterfly valves in high temperature fields. Sin embargo, because its sealing principle is a position sealing structure, eso es, the sealing surface of the butterfly plate and the seat is in line contact, and the elastic deformation caused by the butterfly plate squeezing the seat produces a sealing effect, so the closing position is very demanding (especially the metal seat). Por lo tanto, ductile iron seats are common in double eccentric butterfly valves.
Hierro dúctil válvula de mariposa doble excéntrica’s structure is simple and compact, peso ligero, good sealing performance, fácil de operar, widely recognized by the industry.
Application of double eccentric butterfly valve
Double eccentric butterfly valve has the characteristics of good sealing, pequeña resistencia al flujo, resistencia a la corrosión, etc., so it is widely used in the following fields:
- Industria química
- Metallurgical industry
- Power industry
- Oil and natural gas industry
- Food and pharmaceutical industries
If you happen to need a double eccentric butterfly valve, please contact TWT,Porcelana, we will provide the best quality and the most sincere service.