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Three eccentricity metal hard sealing butterfly valve both advantages and disadvantage

View Times  Update time 2009-02-10

 At present, the butterfly as a piping system used to realize on-off and flow control components, has been in the petroleum, chemical industry, metallurgy, water, electricity and many other fields has been very widely applied.Public-known butterfly valve technology, many forms of their enclosed sealed structure, and sealing materials for rubber, PTFE and so on.As a result of structural characteristics of the restrictions, not meet high temperature, high pressure and resistance Corrosion, abrasion resistance and other industries.

Available a more advanced three eccentric butterfly valves are metal hard seal butterfly valve, valve and valve seat for the Siamese components, valve seat sealing surface layer welding temperature, corrosion resistant alloy material. Ring fixed in the valve plate, the butterfly valve butterfly valve as compared with traditional high temperature, operation light, headstock without friction, the closure of the torque transmission mechanism with the increase to compensate for sealing,

Improve the butterfly valve sealing performance and durability advantages. However, this butterfly valve in the use of the process remain the following questions:
First, because of soft and hard multi-layer stacked ring fixed in the valve plate, when the valve plate when the media always state its sealing surface to form a positive scouring, laminated sheet metal with the soft seal by erosion, the

Directly affect the sealing performance.
Second, the structural condition of the structure to do the following Path DN200 valves, valve plates are the reasons for the overall structure of thick, large flow resistance.
Three, three eccentric structure due to the principle of the valve sealing surface and seal between the valve seat are relying on the torque transmission device to enable the valve to the valve seat pressure. Is flow state, the higher the sealed medium pressure squeeze When the counter-current flow when the medium increased with the medium pressure valve Valve base plate and between the units is less than the pressure of media pressure, the seal started to leak.
Three high-performance two-way eccentric hard sealing butterfly valve, and its characteristics are: Valve base ring described by the soft T-shaped sealing ring on both sides of multi-layer film composed of stainless steel. Valve Valve base plate and the sealing surface for the oblique circle

Cone structure, in the oblique conical surface of valve plate welding temperature, corrosion resistant alloy material; fixed in the regulation loop of the spring between the platen and the platen on the adjustment bolt together assembly structure. Effectively compensated sleeve with the valve body between the tolerance zone and the stem in the medium under the pressure of the elastic deformation, solve 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

Pools tested positive flow state (medium flow direction and the Butterfly board the same rotational direction), the sealing surface pressure are the torque transmission device and media pressure on the valve plate to generate  Positive medium pressure valve plate when the oblique conical surface and the valve seat sealing surface squeeze is tightening, sealing the better.When the current state, the valve plate and the seal between the valve seat by the driver device So that the torque pressure to the valve seat. With medium pressure reverse the increase, valve seat plate and between the units is less than the pressure of media pressure, the adjustment of the spring ring is contained in storage after the Deformation energy compensation valve plate and valve seat sealing surface pressure of the tight play the role of automatic compensation. Therefore this utility model, unlike existing technologies, in the valve plate to install the software and hardware multi-ring, and

Are directly installed in the valve body, in the middle Valve base plate and an additional ring-conditioning are very good two-way sealed hard way. It can be replaced valve, the cut-off valve and ball valve.

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