With the construction and implementation of large-scale national projects, more and more valves are used in electric power, petroleum, chemical industry, urban supply and drainage systems, especially the large amount of butterfly valves, so the problems encountered by users in use are also large Here, the problems that often appear are summed up, and the proper installation and use are instructed, hoping to be helpful to everyone. At present, China's hard seal butterfly valve problems encountered the following categories: First, as a result of multi-layer soft and hard stacked ring seal on the valve plate, when the valve plate normally open state of the sealing surface to form a positive erosion, sheet metal Sandwich in the soft seal by the erosion, a direct impact on the sealing performance. Second, by the structural conditions of the structure does not adapt to do the following DN200 valve, because the overall structure of the valve plate is too thick, large flow resistance. Third, due to the principle of three eccentric structure, the seal between the sealing surface of the valve plate and the valve seat is pressed against the valve seat by the torque of the transmission device. The positive flow state, the higher the media pressure seal squeeze tight. When the flow medium countercurrent media pressure increases with the pressure between the valve plate and valve seat unit pressure is less than the medium pressure, the seal began to leak. At present, the country does not have the corresponding special standards for flexible hard-sealing butterfly valves, and according to the current national standards, the standard size of the flanges will be adopted. Flange diameter and nominal pass through the same basic, this is to increase the effective sealing surface, but also to provide convenient installation, while ensuring the normal use of the valve. Here, to remind users to use flexible hard sealing butterfly valve, the matching anti-flange must use a special flange, especially with the body pressure ring paired pipe flange, be sure to use a special flange. Three-dimensional eccentric seal butterfly valve for hydraulic, gas, electricity, metallurgy, chemical industry, municipal and other industries clean or sewage, oil and gas, natural gas, air and other flammable gases of industrial pipe, used to cut off or adjust the media flow with .
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