1, the structure of the difference: soft seal butterfly valve mostly midline butterfly valve, hard seal for the single eccentric butterfly valve, double eccentric butterfly valve, three eccentric butterfly valve.

2, temperature: soft seal for room temperature environment. Hard seal can be used for low temperature, room temperature, high temperature and other environments.

3, the pressure: soft seal low pressure - atmospheric pressure, hard seal can also be used in high pressure and other conditions.

4, sealing performance: soft seal butterfly valve and three eccentric hard seal butterfly valve sealing performance is better, three eccentric butterfly valve in high pressure and high temperature environment can adhere to a good seal.

In view of the above characteristics, soft seal butterfly valve for ventilation and dust pipeline two-way opening and closing and regulation, water treatment, light industry, petroleum, chemical and other industries. Hard seal butterfly valve for heating, gas, and gas, oil, acid and alkali and other environments.

With the extensive use of butterfly valve, its easy installation, easy maintenance, simple structure features obvious. Electric soft seal butterfly valve, pneumatic soft seal butterfly valve, hard seal butterfly valve in more and more places began to replace the electric gate valve, globe valve and so on.