First, because the multilayer soft and hard superimposed seal is fixed on the valve plate, when the valve plate is often open, the medium has a positive scour to its dense cover, and the soft sealing belt in the interlayer of the metal sheet is scoured, which directly affects the sealing performance.
Two. Restricted by the structural conditions, the structure is not suitable for valves with a diameter less than DN200, because the overall structure of the valve plate is too thick and the flow resistance is large.
Three, because of the principle of three eccentric structure, the seal between the sealing surface and the valve seat of the valve plate is pressed by the torque of the transmission device to make the valve plate press to the valve seat. When the flow is positive, the higher the medium pressure is, the tighter the seal is. When the flow medium is countercurrent, as the medium pressure increases, the unit pressure between the valve plate and the valve seat is smaller than the medium pressure, and the seal begins to leak. The high performance soft sealing butterfly valve is characterized in that the valve seat sealing ring is composed of a plurality of stainless steel sheets on both sides of the soft T shaped sealing ring.
The sealing surface of the valve plate and the valve seat is a conical structure. The temperature resistant and corrosion resistant alloy materials are surfacing on the slanted cone surface of the valve plate, and the structure which is fixed on the spring with the press plate to adjust the bolt assembly. This structure effectively compensates the tolerance belt between the shaft sleeve and the valve body and the elastic deformation of the valve stem under the pressure of the medium, and solves the sealing problem in the two-way interchangeability of the medium.
The sealing ring is made up of soft T type multi-layer stainless steel sheet, which has the dual advantages of hard metal seal and soft seal. It has zero leakage sealing performance in both low temperature and high temperature. It is proved that the pressure of the sealing surface is produced by the torque of the transmission device and the pressure of the medium on the valve plate when the positive flow state of the pool is the same as the rotating direction of the butterfly plate. When the medium pressure increases, the tighter surface of the valve plate and the sealing surface of the valve seat are pressed more tightly, and the sealing effect is better. When the countercurrent is in condition, the seal between the valve plate and the valve seat causes the valve plate to press to the valve seat by the torque of the driving device. As the pressure of the reverse medium increases and the unit positive pressure between the valve plate and the seat is less than the medium pressure, the deformation of the spring of the adjusting ring can compensate the pressure of the tight pressure of the valve plate and the seat sealing surface.
Therefore, the utility model is not like the existing technology. It is installed on the valve body directly on the valve plate. It is an ideal two-way hard seal in the middle of the pressure plate and the seat. It will replace gate valves and spherical valves.
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Product Categories : Industrial Valves > Soft Sealed Butterfly Valve