The D342H elastic hard seal butterfly valve is widely used as a regulating and shut-off device in pipelines for media such as SO2, steam, air, coal gas, ammonia gas, CO2 gas, oil products, water, salt water, alkali solution, seawater, nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, etc. in industries such as chemical, petrochemical, smelting, pharmaceutical, and food. The D342H elastic hard seal butterfly valve adopts a “U” – shaped stainless steel sealing ring, a double eccentric and a special oblique cone elliptical sealing structure. Solved the problem of traditional eccentric butterfly valves still having sliding contact friction on the sealing surface during opening and closing from 0 ° to 10 °, achieving the effect of separation of the sealing surface of the butterfly plate at the moment of opening and sealing at the moment of closing contact, thus extending the service life and achieving the best sealing performance. The D342H elastic hard seal butterfly valve can be equipped with pneumatic and electric devices according to user requirements to meet the needs of remote control and program control. D342H elastic hard seal butterfly valve application scope: D342H elastic hard seal butterfly valve is used in the sulfuric acid industry for gas pipelines: inlet and outlet of furnace front blower, inlet and outlet of relay blower, series and connecting valves for electric defogging, inlet and outlet of S02 main blower, converter adjustment, inlet and outlet of preheater, etc. It is used for regulating and cutting off gas volume. D342H elastic hard seal butterfly valve is used in the sulfur burning, conversion, and dry absorption sections of sulfur based sulfuric acid systems. It is the preferred brand of valves for sulfur based sulfuric acid plants and is widely regarded by users as a butterfly valve with good sealing performance, light operation, secondary corrosion, high temperature resistance, easy operation, flexibility, and safe and reliable use. It has been widely promoted and used. Structural characteristics of D342H elastic hard seal butterfly valve: 1. The D342H elastic hard seal butterfly valve has a simple, compact structure, light weight, easy installation and disassembly, and convenient maintenance; 2. The D342H elastic hard seal butterfly valve adopts a stainless steel “U” – shaped sealing ring, which has a certain degree of elasticity and excellent sealing performance with the butterfly plate under high and low temperature conditions; 3. The U-shaped sealing ring has a long service life, and the valve has an automatic sealing function that becomes tighter as it is closed. The sealing surfaces have compensatory and zero leakage properties. 4. Small size, light weight, easy operation, easy installation, high temperature resistance, low temperature resistance, and corrosion resistance. 5. The sealing surface of the butterfly plate is made of welded cobalt based hard alloy, which is wear-resistant and has a long service life 6. Changing the material of the parts can be applied to various media and can be used for lining anti-corrosion (lining F46, GXPP, PO, etc.). 7. The elastic sealed butterfly valve has a unique structure, and the “switch” can be completed by simply rotating the valve stem 90 °. Flexible, convenient, effortless operation, not affected by the high or low pressure of the medium, reliable sealing performance D342H elastic hard seal butterfly valve main component materials: Part name and material Valve body made of cast iron, cast steel, stainless steel, chromium molybdenum steel, alloy steel Butterfly plate cast steel, alloy steel (hard chrome plated), stainless steel, chromium molybdenum steel Sealing ring made of stainless steel, internal grease, and wear-resistant material Valve stem made of 2Cr13, 1Cr13 stainless steel, and chromium molybdenum steel Filler flexible graphite