One and three eccentric butterfly valve applications
Since the original blast furnace system valves in our country are affected by the scale of the blast furnace, the nominal diameters of the pipelines in the system are mostly small, and most of the valves used in blast furnace systems use vertical gate valves. The product's large size, high quality, installation and sealing effects are not ideal. At present, with the deepening of the large-scale development of ironmaking blast furnaces and the development of energy conservation and environmental protection, the pipeline diameter of blast furnace systems is gradually increasing. For this reason, the vertical gate valve products will no longer be suitable for production in some of the conditions of some large blast furnaces; they are replaced by small size, light weight, small torque, easy installation, simple operation and reliable sealing of the butterfly valve products. .
Application of two and three eccentric butterfly valves
Eccentric butterfly valves have been widely used in ironmaking blast furnaces and are suitable for high temperature gas (flue gas, air, gas, etc.) piping systems in metallurgy, mining, cement, pharmaceutical, chemical, power generation and urban heating industries. Equipment. There are two types of hydraulic drive and electric drive. It is mainly installed in the waste heat utilization system, dry dedusting system and gas pipe network in ironmaking blast furnaces, and has a large nominal diameter, working pressure and low pressure difference between opening and closing, and high temperature (200-350°C). Apply under conditions.
Since most of the pipelines in the metallurgical system are high-temperature (≥200°C) gaseous media, a hard-sealed butterfly valve with an all-metal seal was developed and developed for this purpose, as shown in Fig. 1, namely the metal hard-seal eccentric valve. The butterfly valve adopts surface-to-surface contact. Since the material of the sealing pair is selected as metal, the operating temperature of the eccentric butterfly valve can be above 400°C. However, because the sealing pair is a full metal material, the seal leakage rate of the butterfly valve is difficult to reach the standard A grade (butterfly valve performance ideal state), generally around the C level. In addition, due to the selection of the metal sealing by-product, the elasticity of the metal is easily lost at high temperatures. Therefore, after a period of use, the leakage rate of the valve is significantly increased, and the sealing performance of the valve cannot be guaranteed, thereby greatly reducing the service life of the valve.
The application of three-offset butterfly valves The hard-sealed eccentric butterfly valves of composite materials solve this problem, as shown in Figure 2. The sealing pair of this eccentric butterfly valve is a multi-layered composite material. It is composed of a combination of metal materials and non-metal materials, and has the advantages of high temperature resistance (≤500°C), aging resistance, and good elasticity at high temperatures. In particular, the middle non-metallic sandwich can seal the seal to produce a stepped seal, after long-term use, can still maintain a good, reliable high-temperature use, thereby enhancing the sealing performance of the valve, extending the service life of the valve, in the metallurgical Various systems of blast furnaces have been widely used.
Due to the application conditions of multi-layer composite hard seal eccentric butterfly valves, most of them are normally open or normally closed valve states under high temperature conditions. When the valve is normally open, the medium erodes the high pressure side of the valve plate for a long time. If the multi-layer composite sealing pair is installed on the valve plate, the sealing pair is seriously damaged. When the valve is closed, the valve can easily be trapped. The partial leakage, thus affecting the valve performance. Therefore, a multi-layer compound seal pair should be installed on the valve body so that the multi-layer composite seal pair is flushed by the medium. At the same time, hard alloy is built up at the joint of the valve plate and the multi-layer composite seal, avoiding the above problems. . This type of butterfly valve is widely used in high temperature systems of metallurgical blast furnaces.
Since the original blast furnace system valves in our country are affected by the scale of the blast furnace, the nominal diameters of the pipelines in the system are mostly small, and most of the valves used in blast furnace systems use vertical gate valves. The product's large size, high quality, installation and sealing effects are not ideal. At present, with the deepening of the large-scale development of ironmaking blast furnaces and the development of energy conservation and environmental protection, the pipeline diameter of blast furnace systems is gradually increasing. For this reason, the vertical gate valve products will no longer be suitable for production in some of the conditions of some large blast furnaces; they are replaced by small size, light weight, small torque, easy installation, simple operation and reliable sealing of the butterfly valve products. .
Application of two and three eccentric butterfly valves
Eccentric butterfly valves have been widely used in ironmaking blast furnaces and are suitable for high temperature gas (flue gas, air, gas, etc.) piping systems in metallurgy, mining, cement, pharmaceutical, chemical, power generation and urban heating industries. Equipment. There are two types of hydraulic drive and electric drive. It is mainly installed in the waste heat utilization system, dry dedusting system and gas pipe network in ironmaking blast furnaces, and has a large nominal diameter, working pressure and low pressure difference between opening and closing, and high temperature (200-350°C). Apply under conditions.
Since most of the pipelines in the metallurgical system are high-temperature (≥200°C) gaseous media, a hard-sealed butterfly valve with an all-metal seal was developed and developed for this purpose, as shown in Fig. 1, namely the metal hard-seal eccentric valve. The butterfly valve adopts surface-to-surface contact. Since the material of the sealing pair is selected as metal, the operating temperature of the eccentric butterfly valve can be above 400°C. However, because the sealing pair is a full metal material, the seal leakage rate of the butterfly valve is difficult to reach the standard A grade (butterfly valve performance ideal state), generally around the C level. In addition, due to the selection of the metal sealing by-product, the elasticity of the metal is easily lost at high temperatures. Therefore, after a period of use, the leakage rate of the valve is significantly increased, and the sealing performance of the valve cannot be guaranteed, thereby greatly reducing the service life of the valve.
Figure 1 metal hard seal eccentric butterfly valve
The application of three-offset butterfly valves The hard-sealed eccentric butterfly valves of composite materials solve this problem, as shown in Figure 2. The sealing pair of this eccentric butterfly valve is a multi-layered composite material. It is composed of a combination of metal materials and non-metal materials, and has the advantages of high temperature resistance (≤500°C), aging resistance, and good elasticity at high temperatures. In particular, the middle non-metallic sandwich can seal the seal to produce a stepped seal, after long-term use, can still maintain a good, reliable high-temperature use, thereby enhancing the sealing performance of the valve, extending the service life of the valve, in the metallurgical Various systems of blast furnaces have been widely used.
Due to the application conditions of multi-layer composite hard seal eccentric butterfly valves, most of them are normally open or normally closed valve states under high temperature conditions. When the valve is normally open, the medium erodes the high pressure side of the valve plate for a long time. If the multi-layer composite sealing pair is installed on the valve plate, the sealing pair is seriously damaged. When the valve is closed, the valve can easily be trapped. The partial leakage, thus affecting the valve performance. Therefore, a multi-layer compound seal pair should be installed on the valve body so that the multi-layer composite seal pair is flushed by the medium. At the same time, hard alloy is built up at the joint of the valve plate and the multi-layer composite seal, avoiding the above problems. . This type of butterfly valve is widely used in high temperature systems of metallurgical blast furnaces.
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