I’m using butterfly valves for both the acid and water pipelines. The chief engineer said that these butterfly valves will allow leakage of water, as they can’t be closed properly
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This post was last edited by sdwfsgyykai on 2018-12-1 08:24. I’m using butterfly valves for both the acid and alkali pipelines as well as the pipelines carrying clean water, all of which are connected to a single main pipe. The chief engineer said that these butterfly valves could cause leakage, thereby contaminating the clean water; also, he said that the valves couldn’t be closed properly. Is that possible? So what kind of valve should be used? The diameters are DN125 and DN80
What concentration of acid or base, and what pressure and temperature? If there are no strict requirements, lined ball valves or diaphragm valves can be used
The pressure is not high, around 0.3 MPA. Do ball valves come in large diameters? Are there diaphragm valves available in large diameters as well? Won’t it be leaked?
Soft-sealed butterfly valves work well; fluorine-lined butterfly valves are excellent for sealing in acid and alkali pipelines
Butterfly valves are the most prone to internal leakage among all types of valves
1. First, consider the pressure of tap water and hydrochloric acid; if the pressure of tap water is always higher than that of hydrochloric acid, then hydrochloric acid cannot enter the tap water pipes； 2. Of course, reliable valves are necessary; it is also possible to consider installing dual valves on the tap water pipes to prevent hydrochloric acid from entering them ； Personal opinion, for reference only: handshake
Disk valves can leak, so it’s best not to use them. I think your pipe diameter isn’t too large; an internal ball valve will suffice.