The most obvious difference between the hard seal and the soft seal of the electric butterfly valve is the opposite in terms of performance. The hard seal electric butterfly valve has poor sealing performance, but has high temperature resistance, wear resistance and good mechanical properties, while the soft seal electric butterfly valve It is exactly the opposite of the former in terms of performance.
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. The hard seal is made of metal, and the 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! The 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 be 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 the soft seal.
The main differences in structure are as follows:
1. The difference in structure: soft seal electric butterfly valve is mostly center-line hard seal electric butterfly valve, mostly single eccentric, double eccentric, and triple eccentric.
2. Temperature resistance: soft seal electric butterfly valve is used in normal temperature environment. The hard seal electric butterfly valve 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 working conditions such as medium and high pressure.
4. Sealing performance: The soft seal electric butterfly valve and the triple eccentric hard sealing electric butterfly valve have better sealing performance. The triple eccentric electric butterfly valve can maintain a good seal under high pressure and high temperature environment.
In view of the above characteristics, the hard-seal electric butterfly valve, as a component used to realize the on-off and flow control of the pipeline system, has been extremely widely used in many fields such as petroleum, chemical industry, metallurgy, and hydropower. The soft-sealed electric butterfly valve is suitable for the two-way opening and closing and adjustment of ventilation and dust removal pipelines, water treatment, light industry, petroleum, chemical and other industries. Hard-sealed electric butterfly valves are mostly used in heating, gas, gas, oil, acid and alkali environments.
Electric soft seal butterfly valve
Electric hard seal butterfly valve
