Electric hard seal butterfly valve troubleshooting

First, the multi-layer soft and hard stacked ring fixed to the valve plate, when the valve plate normally open state of the sealing surface to form a positive erosion, sheet metal sandwich in the soft seal by the erosion, directly affect the sealing performance. Second, by the structural conditions of the structure does not adapt to do the following DN200 valve, because the overall structure of the valve plate is too thick, large flow resistance. Third, due to the principle of three eccentric structure, the seal between the sealing surface of the valve plate and the valve seat is pressed against the valve seat by the torque of the transmission device. The positive flow state, the higher the media pressure seal squeeze tight. When the flow medium countercurrent media pressure increases with the pressure between the valve plate and valve seat unit pressure is less than the medium pressure, the seal began to leak. High-performance three eccentric hard seal butterfly valve is characterized in that: the valve seat sealing ring is composed of a plurality of stainless steel sheets on both sides of a soft T-shaped sealing ring. The sealing surface of the valve plate and the valve seat is an oblique conical structure, and a temperature-resistant and corrosion-resistant alloy material is deposited on the oblique conical surface of the valve plate; the spring fixed between the adjusting ring plate and the adjusting bolt on the pressure plate is arranged together. This structure effectively compensates for the tolerance band between the sleeve and the valve body and the elastic deformation of the valve stem under the medium pressure and solves the sealing problem existing in the process of transporting the valve in the bidirectional interchangeable medium. The soft T-shaped multi-layer stainless steel sheet on both sides of the seal ring, with the advantages of both metal seal and soft seal, both in low temperature and high temperature conditions, have zero leakage of sealing performance. Experiments show that pool positive flow state (medium flow direction and disk rotation in the same direction), the sealing surface pressure is the torque of the actuator and the medium pressure on the role of the valve plate. Positive media pressure increases when the valve plate oblique cone surface and seat sealing surface squeeze the more tight, the better the sealing effect. In counter-current conditions, the seal between the valve plate and the valve seat presses the valve plate against the valve seat due to the moment of the drive. As the pressure of the reverse medium increases, the positive pressure between the valve plate and the valve seat is less than the pressure of the medium. The deformation stored by the spring of the adjusting ring after the load is absorbed can compensate for the tight pressure on the sealing surface of the valve plate and the valve seat Play a role in automatic compensation. Therefore, unlike the prior art, the utility model has the advantages that the soft and hard multi-layer sealing ring is mounted on the valve plate and is directly mounted on the valve body, and an adjusting ring is provided between the pressing plate and the valve seat which is a perfect bidirectional hard sealing method . It will replace gate valves and ball valves.