The sealing methods of Sanitary Butterfly Valve mainly include soft seal and hard seal.

One side of the soft seal is made of metal material, and the other side is made of elastic non-metallic material, such as steel + rubber, steel + tetrafluoroethylene, etc. This sealing method has good sealing performance and can achieve zero leakage, but its life and adaptability to temperature are relatively poor, it is not resistant to high temperature, easy to wear, and has poor mechanical properties.

Both sides of the hard seal are made of metal materials or other harder materials, such as steel + steel, steel + copper, steel + graphite, steel + alloy steel, etc. This sealing method is resistant to high temperature, wear-resistant, and has good mechanical properties, but the sealing performance is relatively poor. However, some manufacturers claim that hard seals can achieve zero leakage, although this may vary depending on the specific situation in actual applications.

In sanitary butterfly valves, the selection of sealing materials is crucial because it is directly related to the hygienic performance and durability of the valve. In order to ensure the hygienic nature of the valve, high-quality sealing materials are usually selected and fine polishing is used to achieve a mirror effect, effectively prevent bacterial growth, and meet strict hygiene requirements. At the same time, the design of the sealing structure is also very important. It must ensure that there is no leakage when the valve is closed to avoid cross contamination.