The materials used on both sides of the sealing surface of the soft seal butterfly valve are different. One side uses a metal material, and the other side uses a resilient material such as rubber. This design makes the soft seal butterfly valve have the characteristics of no leakage. In other words, the soft sealing butterfly valve can completely prevent the occurrence of medium leakage.
The service life is different. The service life of the soft seal butterfly valve is shorter than that of the hard seal butterfly valve
Working temperature. The soft seal butterfly valve is suitable for pipelines with normal temperature and low pressure, and the hard seal butterfly valve can be used for pipelines transporting high temperature medium and high pressure
Sealing performance. The soft seal butterfly flange valve can achieve zero leakage, but the hard seal butterfly valve cannot achieve zero leakage