Purpose The elastic metal sealing butterfly valve
adopts a 'U' type stainless steel sealing ring. The precise elastic sealing ring of the valve is in contact with the sealing surface of the chrome-plated and polished butterfly plate. The organic combination of the two has the characteristics of high temperature, high pressure and low temperature. It is widely used in pipelines for heating, steam, water supply, gas, oil, acid and alkali and other media with medium temperature ≤550℃ to adjust flow, cut off or connect fluid. Structural features Double eccentric sealing structure The axis of the valve stem and the sealing surface of the disc are offset by a dimension A, and offset by a dimension B from the axis of the valve body passage. When the disc is opened from 0° to 90°, the sealing surface of the disc will be separated from the sealing surface of the valve seat faster than the single eccentric. When the disc is rotated from 0° to 8° to 12°, the sealing surface of the disc can be completely It is separated from the sealing surface of the valve seat, so that during the opening and closing process of the butterfly valve, the relative mechanical wear between the butterfly plate and the sealing surface of the valve seat is shorter, and the extrusion angle stroke is shorter, thereby reducing the mechanical wear and extrusion deformation. The sealing performance and service life are further improved. 1. Using 'U' type stainless steel sealing ring, the valve seat has a certain elasticity, and it has excellent sealing performance with the butterfly plate no matter in the case of high temperature and low temperature. 2. It is a metal-to-metal wire sealing butterfly valve. The sealing surface of the butterfly plate is made of surfacing stainless steel or surfacing hard alloy. The sealing surface is wear-resistant and has a long service life. 3. Parameters such as butterfly plate streamline design, through rod and wear-resistant bushing make the butterfly valve have excellent sealing performance, temperature resistance, pressure resistance, wear resistance and corrosion resistance. 4. The valve can be designed as flange connection and wafer connection. 5. The drive mode can be manual, electric or pneumatic. Sealing auxiliary structure The rotation center of the disc (ie the center of the valve stem) is offset from the sealing section of the disc by a dimension α, and is offset from the axis of the valve body passage by a dimension β. When the double eccentric butterfly valve is fully open, the sealing surface of the disc will be completely separated from the sealing surface of the valve seat, forming a gap γ, so that the radius of gyration of the disc is divided into a long radius and a short radius. On the large semicircle where the long radius rotates, The tangent of the rotation trajectory of the disc sealing surface will form a θ angle with the sealing surface of the valve seat. When the valve is opened and closed, the sealing surface of the disc has a gradual-out and gradual-in extrusion effect relative to the valve seat, thus reducing the opening and closing. Mechanical numbness and abrasion between the disc and the valve seat. The use of stainless steel metal U-ring or O-ring valve seat not only meets the needs of high temperature working conditions, but also enhances the elasticity of the valve seat. ■Body material Carbon steel (WCB, WCC, LCB) Chrome molybdenum steel (WC5, WC6, WC9) Alloy steel stainless steel (CF3, CF8, CF3M, CF8M, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti) ■Internal material stainless steel (2Cr13, 1Cr18Ni9, 1Cr18Ni9Ti) , 1Cr18Ni12Mo2Ti, 304, 316, 304L, 316L ) carbon steel chrome molybdenum steel special steel Connection form flange, clip, butt welding, lug to clip (flange type)
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