Hard sealing butterfly valve The hard sealing of butterfly valve means that both sides of the sealing pair are made of metal materials or other hard materials. This kind of seal has poor sealing performance, but has high temperature resistance, wear resistance and good mechanical properties. Such as: steel + steel; steel + copper; steel + graphite; steel + alloy steel. The steel here may also be cast iron, cast steel, alloy steel or surfacing, sprayed alloy. Butterfly valve soft seal means: one side of the sealing pair is made of metal material, and the other side is made of elastic non-metallic material. The sealing performance of this kind of seal is good, but it is not resistant to high temperature, easy to wear, and has poor mechanical properties. Such as: steel + rubber; steel + PTFE, etc. The soft seal seat is made of non-metallic materials with certain strength, hardness and temperature resistance. It has good performance and can achieve zero leakage, but its service life and adaptability to temperature are relatively poor. The hard seal is made of metal, and the sealing performance is relatively poor. Although some manufacturers claim to be able to achieve zero leakage. The soft seal cannot meet the process requirements for some corrosive materials. Hard seals can be solved, and the two seals can complement each other. In terms of tightness, soft seals are relatively good, but now the tightness of hard seals can also meet the corresponding requirements. The advantages of soft seals are good sealing performance, but the disadvantages are easy aging, wear and short service life. The hard seal has a long service life, but the sealing performance is relatively poorer than that of the soft seal. The main differences in structure are as follows: 1. Differences in structure Most of the soft-seal butterfly valves are midline type, while the hard-seal butterfly valves are mostly single eccentric, double eccentric and triple eccentric. 2. The temperature-resistant soft seal is used in normal temperature environment. Hard seal can be used in low temperature, normal temperature, high temperature and other environments. 3. The pressure soft seal is low pressure-normal pressure, and the hard seal can also be used in medium and high pressure conditions. 4. Sealing performance Soft seal and triple eccentric hard sealing butterfly valve have better sealing performance. Triple eccentric butterfly valve can maintain a good seal under high pressure and high temperature environment. In view of the above characteristics, the soft sealing butterfly valve is suitable for two-way opening and closing and adjustment of ventilation and dust removal pipelines, water treatment, light industry, petroleum, chemical and other industries. Hard-sealed butterfly valves are mostly used in heating, gas, and gas, oil, acid and alkali environments. With the wide use of butterfly valves, the characteristics of convenient installation, convenient maintenance and simple structure are becoming more and more obvious. Electric soft-seal butterfly valves, pneumatic soft-seal butterfly valves, and hard-seal butterfly valves have begun to replace electric gate valve
s and globe valves in more and more occasions.
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