How to Distinguish Between Hard Seal Butterfly Valve and Soft Seal Butterfly Valve?
The hard seal of the butterfly valve means that the two sides of the sealing pair are made of metal materials or other harder materials, which is called “hard seal”. This kind of seal has poor sealing performance, but has high temperature resistance, abrasion resistance and good mechanical properties. The soft seal means that the two sides of the seal pair are made of metal materials on one side, and the other side is elastic non-metallic materials, which is called “soft seal”. This kind of seal has good sealing performance, but it is not resistant to high temperature, easy to wear, and has poor mechanical properties.
The soft sealing seat is made of non-metallic materials with certain strength, hardness and temperature resistance. It has good sealing performance and can achieve zero leakage, but its life and temperature adaptability are relatively poor. The hard seal is made of metal, and the sealing performance is relatively poor, although some manufacturers claim that it can achieve zero leakage. The soft seal cannot meet the process requirements for some corrosive materials, and the hard seal can solve it! These two types of seals can complement each other. In terms of tightness, the soft seal is relatively good, but now the tightness of the hard seal can also meet the corresponding requirements. The advantage of the soft seal is good sealing performance, but the disadvantage is that it is easy to age, wear, and has a short service life. The hard seal has a long service life, but the tightness is relatively worse than that of the soft seal.
