How to choose a valve for saline media?
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At the site, the pneumatic ball valve used to drain from the bottom of the reaction vessel suffered damage to its seal after being in use for some time. The valve body is made of WCB+F46, and the valve seat is made of PTFE. After disassembly, there are obvious grooves on the sealing surface; this is caused by salts present in the medium. Do any experts have any good solutions to prevent frequent damage to the valve’s sealing surface?
Choose one that is resistant to high temperatures and corrosion
First, it is necessary to analyze whether the formation of this groove is caused by high temperatures, physical particle impurities, corrosion, or other factors Then make targeted selections for reference.
Ceramic valves can be considered for use; ceramic materials possess natural resistance to corrosion, wear, and erosion, offering advantages that metal and precious metal valves simply cannot match. Our company has seen very successful applications of such valves in the salt chemical industry (Kunlun Alkali Industry & Inner Mongolia Yili Chemical Chlorine Workshop). We can discuss the specific medium you are working with in more detail (Liu: 13287974125)
It depends on the operating temperature and the type of medium, as well as whether there are particles present. Excluding the initial investment costs, for media with high salt concentrations, materials such as titanium or Hastelloy are generally preferred; for lower concentrations, duplex steel can be used, as it offers better corrosion resistance and a longer service life