with the development of the society, the society, there are many large engineering projects, therefore, hard seal butterfly valve application more and more, often appear some problems in use. If everyone can understand the common problems of hard seal butterfly valve, and avoid them in the daily use, so let us summarize common problems. 1. Due to the multi-layer soft and hard overlapping seal fixed on the valve plate, when the disc is normally open, form is corrosion medium in the seal surface, soft seal belt from corrosion of metal powder layer, directly affect the sealing performance. R performance. 2. Limited by conditions of structure, the structure is not suitable for production diameter under DN200 valves. Reason is the valve plate overall structure is too thick, large flow resistance. 3. Due to the principle of triple eccentric structure, the valve plate seal face and seat sealing is through the transmission of torque between the valve plate pressure to seat. In is flow state, the higher the medium pressure, seal compression tight. When the countercurrent flow medium, with the increase of medium pressure, valve plate and valve seat unit between the positive pressure is less than the medium pressure, sealing began to leak. At present, the elastic hard seal butterfly valve is not special flange standard. According to the current national standard, under the condition of invariable in France prescribed standard size, the Canon of socket type. Flange diameter and nominal diameter basic same, increased the effective sealing surface, also provides a convenient installation, at the same time to ensure the normal use of the valve. Here to remind the user when using elastic hard seal butterfly valve, special flange must be used to match the flange, especially the pipe flange matching with body pressure ring, must use the special flange. Three dimensional partial hardness sealing butterfly valve is suitable for the hydraulic pressure, gas, electric power, metallurgy, chemical industry, municipal and other industries clean or sewage, oil and gas, natural gas, air and other combustible gas pipeline industry, can also be used to cut off or adjust the medium flow. These are the common problems of hard seal butterfly valve for daily use. I hope they are helpful to everyone. In addition, also need to consider the quality and safety of hard seal butterfly valve. Choose high quality butterfly valve, reduce the problem later.

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