Selection of sealing material for butterfly valves with triple-eccentric structure
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Selection of sealing material for butterfly valves with triple-eccentric structure: The flue gas has a temperature of up to 350 degrees, and it is corrosive due to sulfuric acid and HF; in addition, there are fine ore particles present, so the valve also needs to have good wear resistance. Who knows what kind of sealing material should be used?
It is sufficient to use surfacing in its direct form
Are you using this for catalytic ignition valves? There are many things to consider, such as the material used, the control system, and the purging of the axis point, among others.
Flue gas with a temperature of up to 350 degrees contains sulfuric acid and HF, which are oxidizing and corrosive; in addition, there is concentrate powder present, so the valves also need to have good wear resistance. Firstly, the most common type available on the market is the multi-layer seal made of 316L and graphite. The temperature resistance is no problem. But it is not corrosion-resistant. The wear resistance is worse. Secondly, there is the hard seal made by surfacing with cemented carbide. Since there is powder involved, a hard seal is like a porcelain doll – any single particle will cause it to become unusable. So, it’s better to use the cheaper ones and replace them frequently.