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Difference between pneumatic metal seated and soft seated butterfly valve

2月 4, 2019

In the actual application scenario, because of different equipment and environment, we need to purchase different pneumatic metal seated butterfly valves and pneumatic soft seated butterfly valve to use. The difference between these two kinds ofpneumatic butterfly valvelies in the difference in structure,temperature resistance,pressure and sealing performance.

是什么pneumatic soft seal butterfly valve: the side of the seal pair is made of metal material, and the other side is made of elastic non-metallic material, which is called soft seal. This seal has good sealing performance but is not resistant to high temperature,easy to wear and poor mechanical properties,such as steel + rubber; steel + PTFE rubber; etc. The soft seal seat is made of non-metallic material with certain strength, hardness and temperature resistance. The sealing performance is good and can be made to zero leakage, but life and temperature adaptability is poor.

The seal of thepneumatic metal seated butterfly valveis made of metal and the sealing performance is relatively poor. Soft seal can not meet the process requirements for a part of corrosive materials, but metal seal solve these problems! These two seals can complement each other, and the soft seal is relatively good in terms of sealing, but now the seal of the metal seal can meet the corresponding requirements! The advantage of the soft seal is that the sealing performance is good, and the disadvantage is that it is easy to age, wear, and has a short service life. The metal seal has a long service life, but the sealing performance is relatively inferior to the soft seal.

The differences between pneumatic metal seated butterfly valve and pneumatic soft seated butterfly valve mainly include the following:

1. Structural difference: soft seal butterfly valves are mostly mid-line type,and hard seal butterfly valve mostly single eccentric, double eccentric, triple eccentric butterfly valve;

2.Temperature resistance: soft seal for normal temperature environment. Hard seal can be used in low temperature, normal temperature, high temperature and other environments;

3.压力:软密封applied for low pressure and normal pressure, hard seal can also be used in medium and high pressure conditions;

4. Sealing performance: soft seal butterfly valve and three eccentric metal seal butterfly valve have good sealing performance, and three eccentric butterfly valve can maintain a good seal in high pressure and high temperature environment.

In view of the above characteristics, the pneumatic soft seated butterfly valve is suitable for two-way on/off and regulation of ventilation and dust removal pipelines, water treatment, light industry, petroleum, chemical industry and other industries. And pneumatic metal seated butterfly valves are mostly used for heating, gas supply, oil, acid and alkali environments. With the wide use of butterfly valves, the features of convenient installation, convenient maintenance and simple structure have become more and more obvious. Electric butterfly valve and pneumatic butterfly valve have begun to replace electric gate valves and globe valves in more and more occasions.

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