1. Since the multi-layer soft and hard laminated sealing ring of stainless steel butterfly valve is fixed on the valve plate, when the valve plate is normally open, 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 after being scoured. performance.
Second, the stainless steel butterfly valve is restricted by the structural conditions. The structure is not suitable for valves with a diameter below DN200. The reason is that 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.
