The combined structure of the valve plate and the valve seat of the soft sealing butterfly valve
The combined structure of the valve plate and the valve seat of the soft sealing butterfly valve plus its attention and treatment methods. The sealing surface of the soft sealing butterfly valve disc and the valve seat is an oblique cone structure. The oblique cone surface of the valve plate is welded with temperature resistance, Corrosion-resistant alloy material; a structure in which the spring fixed between the pressure plate of the adjusting ring and the adjusting bolt on the pressure plate of the soft sealing butterfly valve are assembled together. This structure effectively compensates for the tolerance zone between the shaft sleeve and the valve body and the elastic deformation of the valve stem under the medium pressure, and solves the sealing problem of the soft-sealed butterfly valve valve in the two-way interchangeable medium conveying process.
The soft sealing butterfly valve adopts a soft T-shaped multi-layer stainless steel sheet on both sides to form a sealing ring. It has the dual advantages of a metal hard seal and a soft seal. The soft seal butterfly valve has a sealing performance of zero leakage regardless of low temperature and high temperature. The test proves that when the pool is in a positive flow state (the flow direction of the medium is the same as the direction of rotation of the butterfly plate), the pressure on the sealing surface of the soft sealing butterfly valve is produced by the torque of the transmission device and the effect of the medium pressure on the valve plate. When the positive medium pressure increases, the tighter the oblique cone surface of the valve plate and the sealing surface of the valve seat are pressed, the better the sealing effect of the soft sealing butterfly valve.
1. Since the multi-layer soft and hard stacked sealing ring is fixed on the valve plate, when the valve plate is in the normally open state, the medium will form a positive erosion on its sealing surface, and the soft sealing band in the metal sheet sandwich will directly affect the sealing performance after being washed.
2. Restricted by structural conditions, this structure is not suitable for valves with a diameter below DN200, because the overall structure of the valve plate is too thick and the flow resistance is large.
3. Due to the principle of the triple eccentric structure, the seal between the sealing surface of the valve plate and the valve seat depends on the torque of the transmission device to press the valve plate against the valve seat. In the positive flow state, the higher the medium pressure, the tighter the sealing extrusion. When the flow channel medium flows back, as the medium pressure increases, the unit positive pressure between the valve plate and the valve seat is less than the medium pressure, the seal begins to leak.
