Selection of steam on/off valves
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Selection of on-off valve for 3.5Mpa, 380 degrees, DN100. A hard-sealed ball valve is planned to be used, with the valve body made of 304 material, the valve core and seat made of 316+STL, and graphite packing. Everyone, does anything seem wrong? Or any other good suggestions.
The valve body is fine; the accessories also need to be considered
Never use duplex stainless steel; what was said on the 3rd floor is incorrect. Indeed, duplex steel has better corrosion resistance than austenitic and ferritic stainless steels, but it can only be used over a temperature range of -50 to 250 degrees Celsius. For valves used in steam systems, 304 is sufficient.
Actually, a carbon steel valve body will do; WC6 mentioned on the 5th floor is an excellent choice. I think WCA would work as well... Take a look at this: http://bbs.hcbbs.com/forum.php?mod=viewthread&tid=324012
Creep resistance strength? WCB deforms at high temperatures, which can cause the valve to stick.