1. The single eccentric butterfly valve is to solve the extrusion problem of the butterfly plate and the valve seat of the butterfly valve. The valve stem and the shaft center are deviated from the center of the butterfly plate, so that the upper and lower ends of the butterfly plate no longer become the rotation axis, which is dispersed and reduced. Excessive extrusion of the end to the seat.
2. Double eccentric high-performance butterfly valve is a kind of elastic hard seal, which is further improved on the basis of single eccentric. Disengaged from the valve seat, the unnecessary excessive extrusion and scratching between the butterfly plate and the valve seat are largely eliminated, the opening resistance is reduced, the wear is reduced, and the service life is improved. Some manufacturers of double eccentric butterfly valve do not do the sealing and sealing technology in place, and the valve plate is easy to close.
3. For triple eccentricity, a hard seal must be used in order to withstand high temperature, but there is leakage. To zero leakage, a soft seal must be used, but the soft seal is not resistant to high temperature. The secondary eccentricity means that the shape of the sealing pair is not a positive cone, but a sloping cone. The tighter the valve is, the tighter it is. It is a multi-level structure, with high pressure resistance and high temperature resistance.
