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Should we use a soft seal or a hard seal for the electric butterfly valve?

by:Sino Valves     2021-03-18
Electric soft sealing butterfly valve: the sealing pair is made of metal material on one side and elastic non-metal material on the other side, which is called 'soft seal'. 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 tetrafluoroethylene and so on. The soft sealing seat is made of non-metallic materials with certain strength, hardness and temperature resistance. It has good sealing performance and can achieve zero leakage, but its life and temperature adaptability are relatively poor. Electric hard seal butterfly valve: The two sides of the sealing pair are made of metal materials or other harder materials are called 'hard seals'. This kind of seal has poor sealing performance, but has good high temperature resistance, wear resistance and 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). The electric hard-sealed butterfly valve is made of metal, and its sealing performance is relatively poor, although some manufacturers claim that it can achieve zero leakage. The soft seal cannot meet the process requirements for some corrosive materials, and the hard seal can solve it! These two types of seals can complement each other. In terms of tightness, the soft seal is relatively good, but now the tightness of the hard seal can also meet the corresponding requirements! The advantage of the soft seal is good sealing performance, but the disadvantage is that it is easy to age, wear, and has a short service life. The hard seal has a long service life, but the tightness is relatively worse than that of the soft seal. The main differences in structure are as follows: 1. The difference in structure: the electric soft seal butterfly valve is mostly centerline type, and the hard seal is mostly single eccentric, double eccentric, and triple eccentric butterfly valves. 2. Temperature resistance: soft seal is used for normal temperature surroundings. Hard seal can be used in low temperature, normal temperature, high temperature and other environments. 3. Pressure: soft seal low pressure-normal pressure, hard seal can also be used in medium and high pressure conditions 4. Sealing performance: soft seal and triple eccentric hard seal butterfly valve have better sealing performance , The triple eccentric butterfly valve can maintain a good seal under high pressure and high temperature environment. Due to the advantages of convenient installation, convenient maintenance and simple structure, electric butterfly valves replace gate valves and globe valves in more and more occasions.
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