Issues regarding the selection of high-temperature and ultra-high-temperature butterfly valves
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Currently, there are several large-diameter, high-temperature and ultra-high-temperature butterfly valves. The designers have chosen triple-eccentric design with flange connections, and stainless steel has been used as the material; the corresponding temperature ranges are 250°C, 300–450°C, and 800–1100°C respectively. The media involved are high-temperature dusty flue gases and circulating gases. Now, the issue is that for ultra-high-temperature applications, water-cooled butterfly valves were originally intended to be used, but the designers opted for triple-eccentric butterfly valves made of 304 stainless steel. There are concerns that this material and design may not be able to withstand such high temperatures. Would end-face sealing be a better option? We would appreciate it if everyone could share their insights and discuss this matter. Manufacturers or users with relevant experience are also asked to provide recommendations. Thank you.
Can’t metal sealing surfaces withstand high temperatures?
The key is how the triple-eccentric stainless steel butterfly valve can withstand an operating temperature of 1100°C.
Or choose other suitable materials that are wear-resistant and heat-resistant
With such high temperatures, an inner lining is necessary, right? Otherwise, what material could be suitable?
The triple-eccentric hard-sealed butterfly valve is resistant to high temperatures; the specific temperature threshold it can withstand depends on the material chosen. 310S stainless steel can barely tolerate temperatures of up to 1100°C, and welding STL onto the sealing surface improves its resistance to high temperatures further. It is however better to have a cooling device in front of the valve, as that ensures better performance and a longer service life for the valve.
How about 2520 material? I have given suggestions to the clients, but it’s likely difficult to change their minds. Using 304 triple-eccentric butterfly valves that can withstand temperatures of 800–1100 degrees is really a concern.
2520 is what is referred to as 310S; 2520 is the designation according to Chinese standards, while 310S is the designation according to American standards. The issue is that 310S too cannot be used at temperatures higher than 800 degrees Celsius
Since the design has been clearly decided in this way, there’s no need to worry
We repaired a flue damper here; F321 was used, and the specific temperature rating is not known
Are there any requirements regarding the amount of leakage? If leakage is acceptable, high-temperature flue damper valves can be used