vacuum butterfly valve product features are as follows: 1. Using short line type disc plate and structural steel welding new structure design and manufacture. Compact structure, light weight, easy installation, small flow resistance, large flow, avoid the influence of high temperature expansion, easy to operate. 2. No the connecting rod, bolts, etc. , and reliable, long service life. It can be installed in multiple sites, not affected by medium flow direction. The structure characteristics of the vacuum butterfly valve, vacuum butterfly valve is to use a new type of structural form, namely the line type structure of the disc plate with short steel welded together. Its compact structure, light weight, easy installation, small flow resistance, large flow, avoid the influence of high temperature expansion, easy to operate. In the body without connecting rod and bolt, reliable operation, long service life. It can be installed in multiple sites, not affected by medium flow direction. But in the use of vacuum butterfly valve, there are still some problems: a. Due to multi-layer soft laminated seal ring is fixed on the valve plate, when the disc is normally open, form is corrosion medium in the seal surface, soft sealing strip after cleaning of metal sandwich will directly affect the sealing performance. 2. By the structural constraints, the structure does not apply to the following DN200 valves diameter, because the valve plate overall structure is too thick, large flow resistance. 3. Due to the working principle of the line with rubber butterfly valve, valve plate seal face and seat sealing between depends on the transmission torque, the valve plate pressure to the valve seat. In is flow state, the higher the medium pressure, seal compression tight. When the reverse flow of the medium, as the medium pressure increases, the unit of positive pressure between the valve plate and valve seat is less than the medium pressure, sealing began to leak. Therefore, with the existing technology, the utility model is installed directly on the body, rather than the hard and soft multi-layer sealing ring installed in the valve plate, between plate and valve seat to increase the adjusting ring is a very ideal method of bidirectional hard seal. It will replace gate valve and ball valve.

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