Are there valves capable of withstanding high-temperature flue gas at 800 degrees?
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Is there a valve capable of withstanding high-temperature flue gas at 700–800 degrees, where the gas contains a small amount of abrasive dust, and water cooling is not possible on site? When in normal use, it is either fully open or fully closed. It seems that making it into a gate valve results in an oversized size that cannot fit in place; could it be made as a blind flange valve instead?
Consider plug valves; if very tight sealing is not required, LOUVER PLATES DAMPERS can be considered.
High-temperature flue gas butterfly valve, made of special materials to resist corrosion and wear
A 310s stainless steel butterfly valve will do
There are specialized flue butterfly valves with linings.
High-temperature flue gas butterfly valves have been manufactured for operating temperatures of 800°C, with transient temperatures reaching 850°C; the internal leakage rate is around 1%-3%. The material used is 2520. The length between the valve body and the actuator is increased, and the extended section of the valve stem is taken into account during on-site insulation work.
Manufacture hard-sealed butterfly valves that are resistant to high temperatures and corrosion. It can be made into an extended rod
Plug valves capable of withstanding temperatures over 900°C have been installed, with fire-resistant materials used for lining