The difference between hard seal ball valves and soft seal ball valves

1. Sealing structure: The sealing structure of the hard sealed ball valve is realized by the tight bite between the metal and the metal, and the sealing is good; The soft seal ball valve is filled with sealing materials, and the tightness depends on the elasticity and viscosity of the material itself.

2. Applicable temperature: Because the hard sealed ball valve uses a metal seal structure, the applicable temperature is relatively high, generally able to reach -196 ° C ~+650 ° C; The sealing material temperature range of the soft seal ball valve is relatively small, and most can withstand the temperature between -20 ° C and +180 ° C.

3. Applicable media: hard seal ball valve because the sealing structure is more reliable than soft seal ball valve, so the applicable media range is wider, can be used for gas, liquid, steam and other media; The soft seal ball valve is suitable for some media that do not contain particles, do not corrode, do not crystallize.

4. Sealing performance: The sealing performance of hard sealed ball valve is better than that of soft sealed ball valve, and the reliability is higher. The sealing performance of the soft seal ball valve depends on the elasticity and viscosity of the filled sealing material, which is susceptible to the influence of medium erosion and aging, and the sealing performance is relatively poor.

Application 

1. Hard sealed ball valve is suitable for medium control under high pressure, high temperature and harsh working conditions, such as petroleum, chemical, fertilizer and other industries.

2. Soft seal ball valve is suitable for some media is relatively safe, pressure, temperature and other parameters are not too high occasions, such as food, pharmaceutical, sewage treatment and other industries.

In the selection of ball valves, it is necessary to consider the media, working conditions, temperature, pressure and other factors, choose the appropriate ball valve to ensure the safety, reliability and stability of the system.