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The difference between electric hard seal butterfly valve and electric soft seal butterfly valve

Sep 09,2022 Posted by Bundor

Industry News
With the rapid development of many industrial fields in our country, industrial automation has slowly replaced the artificial operation system, especially the use of all kinds of automatic control valves. Electric butterfly valve with its unique structural characteristics, has become one of the most used valve types, and its range of application is also the most extensive.But in different working conditions, it is particularly important to choose different electric butterfly valves, which do not waste costs and save resources.From the  sealing structure form of valve, electric butterfly valve can be divided into soft seal and hard seal two categories.So what is the difference between them, which has more advantages on earth, and how should we distinguish and choose?

The difference between electric hard seal butterfly valve and electric soft seal butterfly valve, is mainly reflected in the performance and structure.The two types of seals can complement each other. Both of them have their own advantages and disadvantages. The advantage of one party may be the deficiency of the other party. When choosing, users should combine their own needs and working conditions to analyze and choose the right product.

The main differences are as follows:

1.From the structure: the electric soft seal butterfly valve is mostly a linear structure, the sealing material is generally fluorine plastic, rubber, resin and so on,it has good corrosion resistance and sealing.If you choose different materials of parts, you can apply to a variety of media.Electric hard seal butterfly valve is generally single eccentric, double eccentric, three eccentric butterfly valve, it uses stainless steel + hard alloy to seal.There is no friction between the sealing surface of the three eccentric butterfly valve,with high temperature resistance, wear resistance, good mechanical properties and other characteristics.
2.From temperature resistance: Soft seal is used in normal temperature environment,and hard seal can be used in low temperature, normal temperature, high temperature environment and so on;
3.From the pressure: soft seal can be used in low pressure and atmospheric pressure, hard seal can also be used in high pressure and other conditions.
4.From the sealing performance: the sealing performance of soft seal butterfly valve is better,it can achieve zero leakage,but its disadvantage is easy to aging, wear and tear, short service life.The hard seal butterfly valve can maintain good operation under high pressure and high temperature, it is more resistant to wear,has good mechanical property and long service life, but the sealing performance is poor.
When the electric butterfly valve is opened and closed, it not only saves effort, but also has small flow resistance and is convenient and rapid to operate.It is light in weight, small in size, and has a relatively simple structure.Customers can choose soft seal or hard seal butterfly valve according to economic conditions, and the use of media, field environment, etc.

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