Issues with the use of valves for ammonia
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This post was last edited by kaminocmyhc on 2009-8-8 21:33. Are ammonia valves necessary for liquid ammonia and gaseous ammonia pipelines? I would also like to ask: by a valve made of ammonia-resistant material, it means that the core of such a valve does not contain copper. Does that imply that other valves contain some amount of copper in their structure? If present, in which structural part is copper contained?
Same question, waiting for an answer. . .
The ammonia pressure system must use specialized valves; it is evident that these valves differ from ordinary ones in terms of their sealing performance, which is better. Leave the last two questions for experts to answer.
It seems that most alloy steels contain copper, which can improve the wear resistance of the material.
Copper is not present either in typical alloy materials. Lost in confusion~~~~~~~~~~~·
Personally, I believe no part of the valve should contain copper; even if external components do contain copper, they will corrode rapidly in an ammonia atmosphere. As for the types of valves, ball valves and globe valves are the most common, with 4F butterfly valves also being used. I haven’t found anything particularly special about the valves designed for ammonia; if anyone knowledgeable is out there, please give some advice! !
The main difference is that the sealing surface of the ammonia valve is made of busbar alloy
Liquid ammonia or ammonia gas systems must use specialized valves designed for ammonia use. The sealing surfaces of these ammonia valves are made of brass alloy, polytetrafluoroethylene material, or stainless steel; the valve bodies are constructed from carbon steel, stainless steel, or ductile iron. No copper components may be used in any part of ammonia valves
In this light, ammonia valves don’t seem to have anything special either; most valves also have these sealing surfaces. Is there anything special about its structure? I have a question!
The standard requirement for the sealing surfaces of the new version of ammonia valves is PTFE, whereas it was babbitt alloy before. Moreover, the spool of the ammonia valve is equipped with a PTFE upper seal, and its size and shape differ from those of ordinary valves.
You all are experts; I’ve learned from you.