Selection of acid discharge valves for converted flue gas heat exchangers
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For the acid discharge connections of heat exchangers that handle hot and cold fluids, can Q41F-H valves be used? This post was last edited by in the blink of an eye on 2008-1-10 16:39.]
It seems to be a ball valve; could you please tell me what material it is made of?
Gray cast iron, lined with PTFE. The valve here does not need to be operated frequently. It’s probably for maintenance purposes. This valve has already been installed, but some people say that a PTFE lining cannot be used here. Because the flue gas temperature is high, at 400 degrees.
A regular gate valve will suffice. It’s relatively inexpensive and practical. Our company uses gate valves exclusively, with the valve model being Z41H-10.
Stainless steel ball valves are used on-site in my workshop.
What material is the sealing surface made of? Is it F4 or a hard seal?
The Q41F-H is likely a ball valve lined with PTFE; it can be used without issues. Although the temperature inside the heat exchanger exceeds 400 degrees, the acid discharge port is a dead zone that is generally not utilized, and PTFE can withstand temperatures up to 250 degrees. However, we generally use stainless steel ball valves; PTFE has been used in the past.
Our company has used stainless steel ball valves before, and the results were good；