Talk about pressure relief valves, emergency shut-off valve and open the valve settings

 At present, the butterfly valve is used to achieve piping system as an on-off and flow control components, has been in the petroleum, chemical industry, metallurgy, water, electricity and many other areas to be very widely used. In the known butterfly has been recognized technology, its sealed form of multi-sealed structure, sealing material for rubber, PTFE and so on. As the structural characteristics of the restriction is not suitable for high temperature, high pressure and corrosion resistance, abrasion resistance and other industries.

     Present a more sophisticated three eccentric butterfly valve is metal seal butterfly valve, valve and valve seat as the Siamese components, valve seat sealing surface layer welding temperature, corrosion resistant alloy material. Soft-stacked multi-ring fixed to the valve plate, this butterfly valve in comparison with the traditional high temperature, easy operation, open and close without friction, closed with the transmission of the torque increases to compensate for seal, to improve a butterfly valve sealing performance and durability advantages.

     However, this butterfly is still in the course of the following problems:

     1, due to soft and hard stacked multi-ring fixed to the valve plate, when the valve plate to its normal open state media, the formation of a positive sealing surface erosion, and metal sheets laminated in the soft-sealing tape subject to erosion, the direct impact on seal performance. 

     

     Third, because the principle of the three eccentric structure, the valve plate sealing surface and the seal between the valve seat is to rely on the torque transmission device so that pressure valve plate to the valve seat. Positive flow state, the media, the higher the pressure squeezed more tightly sealed. When the flow channel upstream medium with medium pressure increases when the valve plate and seat the pressure between the units is less than the medium pressure, the seal started to leak out.

     High-performance 3-way eccentric hard-seal butterfly valve, its characteristics are: described by a soft T-shaped valve seat ring seal ring on both sides of the composition of multi-layer stainless steel sheet. Valve plate and valve seat sealing surface for the oblique cone structure, in the valve plate oblique cone surfacing temperature, corrosion resistant alloy materials; fixed platen in the regulation of rings between the spring and the adjustment bolt assembly with the platen structure. This structure effectively compensate for the tolerance between the sleeve and the valve stem in the medium zone and the elastic deformation under pressure to solve the two-way valve in the transmission medium of exchange that exist in the process of sealing problems. Use of soft T-seals on both sides of the composition of multi-layer stainless steel sheet with a metal seal and soft seal the dual advantages of both the low and high temperature cases, both with zero leakage sealing performance.

     Test proved positive flow state (medium flow direction and the butterfly plate rotation in the same direction), the sealing surface pressure is the transmission of torque and media pressure on the valve plate of the role of the elected. Positive medium pressure increases, valve plate oblique cone surface and the valve seat sealing surface squeezed more tightly, sealing the better. When the counter-current state, the valve plate and valve seat through the seal between the drive torque to the valve seat so that pressure valve plate. With the reverse-media pressure, valve plate and valve seat unit between the positive pressure is less than medium pressure, the adjustment of the spring ring is contained in the subject after the deformation energy stored in compensation valve plate and valve seat sealing surface of the tight the pressure to play the role of automatic compensation. Therefore, this utility model, unlike existing technologies, as the valve plate to install software and hardware multi-ring, but directly installed on the valve body, in the platen, and the middle seat an additional adjustment ring is a very good two-way hard-sealing method . It can replace valve, the cut-off valve and ball valve. ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve V Type Ball Valve
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