Knowledge about hard seal and soft seal of butterfly valve

This has to be determined based on your actual situation.

Butterfly valves are classified in many ways: According to the sealing material, there are soft seal butterfly valves and hard seal butterfly valves. Soft seal butterfly valve: The sealing pair is composed of non-metal soft material to non-metal soft material, or from metal hard material to non-metal soft material. Hard seal butterfly valve: The sealing pair is composed of metal hard material to metal hard material. 1. Structural differences: Soft seal butterfly valves are mostly centerline type, and hard seal butterfly valves are mostly single eccentric, double eccentric, triple eccentric butterfly valves. 2. Temperature resistance: Soft seal butterfly valve is used in normal temperature environment. Hard-sealed butterfly valves 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 working conditions. 4. Sealing performance: Soft seal and triple eccentric hard seal butterfly valve have better sealing performance. Triple eccentric butterfly valve can maintain good sealing in high pressure and high temperature environments. In view of the above characteristics, soft-sealing butterfly valves are suitable for bidirectional opening, closing and adjustment of ventilation and dust removal pipelines in water treatment, light industry, petroleum, chemical and other industries. Hard-sealed butterfly valves are mostly used in heating, gas supply, gas, oil, acid and alkali and other environments. With the widespread use of butterfly valves, their features of easy installation, convenient maintenance, and simple structure have become more and more obvious. Electric soft-sealing butterfly valves, pneumatic soft-sealing butterfly valves, hard-sealing butterfly valves, etc. have begun to replace electric gate valves, globe valves, etc. in more and more occasions. Detailed reference: http://www.tvtvalve.com/blog

In fact, the selection of butterfly valves depends on many factors such as the specific working conditions, parameters involved, and the purpose of the company. I am happy to answer your questions about regulating valves! !

The answer from the 4th floor is good, learn from it* . The choice of hard seal or soft seal for the valve should be based on the process conditions.

In fact, both hard seals and soft seals can be used in some working conditions, such as the outlet of a water pump. The only difference is in price. It depends on the choice of the householder. The other categories have been discussed above. In addition, ventilation and dust removal pipelines basically use ventilation butterfly valves, and soft seals are rarely used. Some other temperatures are so high that the soft sealing rubber melts away directly.

Because the company is making ship valves, there are many types of butterfly valves. Since the medium to be tolerated is usually sea water, customers tend to choose soft seals. Sometimes if some chemicals are used, fluorine-lined ones are used. If they are eccentric, hard seals are the main ones. What the person above said is good, I also follow it.* . http://shop101677627.taobao.com This is Taobao that I just learned to make. Those who are interested in ship valves can also have time to join in the fun. http://svsship.szc.com This is a free company website made by myself. It contains many companies’ main ship valves. If you have needs in this regard, you can also go in and make a reference and comparison. :P