At present, the butterfly valve as a pipeline system used for on-off and flow control components, has been in the petroleum, chemical industry, metallurgy, water, electricity and many other fields has been very widely used. The public to know in the butterfly valve technology, the use of its seal form sealed structures, sealing materials for rubber, PTFE and so on. Structural characteristics as a result of the restrictions, not meet high temperature, high pressure and corrosion resistance, abrasion resistance and other industries.
A more advanced existing three eccentricity metal butterfly hard seal butterfly valve, valve body and seat components for the Siamese, the valve seat sealing surface layer welding temperature, corrosion resistant alloy material. Stacked multi-layer soft ring fixed in the valve plate, the butterfly valve butterfly valve as compared with traditional high temperature, operation light, no friction hoist, the closure of the torque transmission mechanism with the increase to compensate for sealing to improve the a butterfly valve sealing performance and durability advantages.
However, this butterfly is still in the course of the following questions:
I, as a result of hard and soft multi-layer stacked ring fixed in the valve plate, when the valve plate when the media always state of the formation of its positive sealing surface erosion, metal film sandwich with the soft seal by erosion, the direct impact on seal performance.
Second, the structural condition of the structure to do the following path DN200 valves, valve plates due to the overall structure of thick, large flow resistance.
Third, due to the structure of the three principles of eccentricity, valve plate and valve seat sealing surface is sealed between the gear on so that the torque pressure to the valve seat. Is flow state, the higher the pressure medium sealed more tightly squeezed. When the medium counter-current flow when the pressure increases with the dielectric plate and the valve seat between the valve units are smaller than the pressure of pressure medium, the seal started to leak.
Two-way high-performance three-eccentric hard-seal butterfly valve, is characterized by: the valve seat ring described by the soft sealing ring on both sides of T-shaped multi-layer film composed of stainless steel. Valve seat plate and the sealing surface for the oblique cone structure, in the oblique conical surface of valve plate welding temperature, corrosion resistant alloy material; fixed loop in the regulation of the spring between the plate and the plate with the adjustment bolt assembly structure.
This structure effectively compensation between the sleeve and the valve stem of the tolerance zone and in the media of elastic deformation under pressure to resolve the two-way valve in the transmission medium of exchange that exist in the process of sealing problems. T-soft on both sides of the use of multi-layer film composed of stainless steel ring with a hard metal sealing and soft sealing the dual advantages of low temperature and high temperature in both cases, all with zero leakage sealing performance.
Pools tested positive flow state (medium flow direction and rotation direction of the same butterfly plate), the sealing surface pressure is the transmission of torque and media pressure on the valve plate of the role. Medium pressure increases toward the valve seat surface and oblique cone sealing surface squeezed more tightly, sealing the better. When the current state, the valve seat plate and the seal between the drive torque on the valve so that pressure to the valve seat. With the increase reverse medium pressure, valve seat plate and between the units is less than the pressure of pressure medium, the adjustment ring is contained in the spring after the deformation energy stored in the compensation of the valve seat sealing surface and the tight the pressure to play the role of automatic compensation. Therefore this utility model, unlike the existing technology, the installation of hardware and software in the on-board multi-valve seals, but directly installed in the valve body, in the middle of plate and the seat adjustment is the addition of a very good two-way sealed hard way . It will be replaced by valve, the cut-off valve and ball valve .Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve Three way ball valve V Type Ball Valve
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