Butterfly Valve generally adopt a three-eccentric multi-layer metal hard-sealing structure and are frequently used in industrial pipelines such as metallurgy, electric power, petrochemical industry, water supply and drainage, and municipal construction with medium temperatures ≤425°C to regulate flow and load-break fluids. The valve adopts a triple eccentric structure. The Universal Valve and the disc sealing surface are made of different hardness and stainless steel. It has good corrosion resistance and long service life. The commonly used connection methods of Butterfly Valve are divided into flange-type turbine Stainless Steel Butterfly Valve and wafer-type stainless steel Butterfly Valve.
Due to the limitations of structural characteristics, it is not suitable for industries such as high temperature resistance, high pressure resistance, corrosion resistance, and wear resistance. An existing relatively advanced Butterfly Valve is a triple-eccentric metal hard-seal Butterfly Valve. The valve body and the Universal Valve are one-piece components, and the sealing surface layer of the Universal Valve is overlayed with temperature-resistant and corrosion-resistant alloy materials. Multi-layer soft stacked sealing rings are fixed on the valve plate. Compared with traditional Butterfly Valve, this Butterfly Valve has high temperature resistance, is easy to operate, and has no friction in opening and closing. When closing, the torque of the transmission mechanism increases to compensate for the sealing, improving the The Butterfly Valve has the advantages of sealing performance and extended service life.
In the forward flow state, the higher the medium pressure, the tighter the sealing squeeze. When the medium in the flow channel flows countercurrently and as the medium pressure increases, the unit positive pressure between the valve plate and the Universal Valve is less than the medium pressure, and the seal begins to leak. A high-performance three-eccentric two-way hard-seal Butterfly Valve is characterized in that: the Universal Valve sealing ring is composed of multiple layers of stainless steel sheets on both sides of a soft T-shaped sealing ring. The sealing surface of the valve plate and the Universal Valve is an oblique cone structure, and the temperature-resistant and corrosion-resistant alloy material is overlayed on the oblique cone surface of the valve plate; the spring fixed between the adjusting ring pressure plate and the adjusting bolt on the pressure plate are assembled together. This structure effectively compensates for the tolerance zone 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 valve during the two-way exchange of medium transportation processes. The sealing ring is composed of soft T-shaped multi-layer stainless steel sheets on both sides, which has the dual advantages of metal hard sealing and soft sealing. It has zero leakage sealing performance regardless of low or high temperature conditions. In the forward flow state, the pressure on the sealing surface is caused by the torque of the transmission device and the action of the medium pressure on the valve plate. When the forward medium pressure increases, the tighter the squeeze between the oblique conical surface of the valve plate and the sealing surface of the Universal Valve, the better the sealing effect. When in the reverse flow state, the seal between the valve plate and the Universal Valve relies on the torque of the driving device to force the valve plate to press against the Universal Valve. As the reverse medium pressure increases, when the unit positive pressure between the valve plate and the Universal Valve is less than the medium pressure, the deformation stored in the spring of the adjusting ring after being loaded can compensate for the tight pressure on the sealing surface of the valve plate and the Universal Valve. Play an automatic compensation role. Therefore, this utility model does not install soft and hard multi-layer sealing rings on the valve plate like the existing technology, but is installed directly on the valve body. Adding an adjustment ring between the pressure plate and the Universal Valve is an ideal two-way hard sealing method. .
