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Applications and structural features of elastic metal hard-sealed butterfly valves. Elastic metal-sealed butterfly valves are **high-priority new products; these high-performance valves utilize a dual-eccentric design as well as a special inclined-cone elliptical sealing structure. It overcomes the drawback of traditional eccentric butterfly valves, in which the sealing surfaces remain in a state of sliding contact and friction during the opening and closing process from 0° to 10°; it ensures that the sealing surfaces separate immediately when the butterfly plate opens and come into contact to form a seal when it closes, thereby extending the service life and achieving optimal sealing performance. Purpose: Used in the sulfuric acid industry for gas pipelines: at the inlets and outlets of the blast fans in front of the furnace, at the inlets and outlets of the backup fans, for the series connection and connection valves of electrostatic precipitators, at the inlets and outlets of the main S02 blast fans, for regulator control in converters, and at the inlets and outlets of preheaters – to regulate and control the flow rate of gas. Used in the sulfur burning, conversion, and dry absorption sections of sulfur-based acid production systems, it is the preferred brand of valves for such installations. Users consider it a butterfly valve with excellent sealing performance, smooth operation, resistance to corrosion, high-temperature tolerance, as well as ease of operation and flexibility; it is also safe and reliable, which has led to its widespread use. It is also widely used in industries such as chemicals, petrochemicals, smelting, pharmaceuticals, and food processing, where it serves as a regulating and shutoff device for pipelines carrying media such as SO2, steam, air, gas, ammonia, CO2, oils, water, brine, alkaline solutions, seawater, nitric acid, hydrochloric acid, sulfuric acid, and phosphoric acid. Structural features: ① The unique three-way eccentric design eliminates frictional transmission between the sealing surfaces, thereby extending the valve’s service life. ②The elastic seal is generated by torque. ③The clever wedge design enables the valve to achieve an automatic sealing effect that becomes tighter as it is closed, with compensatory mechanisms between the sealing surfaces to ensure zero leakage. ④Small in size, light in weight, easy to operate, and simple to install. ⑤Pneumatic and electric devices can be configured according to user requirements to meet the needs of remote control and programmed operation. ⑥Changing the material of the components allows use with various media, and lining for corrosion protection is available (lining made of F46, GXPP, PO, etc.). ⑦Continuous structure diversity: clamp, flange, butt weld.