Application cases of C-type ball valves
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This post was last edited by saibinfm on 2023-7-7 08:14. Customer’s description: The medium is fluorine, which is highly toxic; temperature: room temperature. Technical requirements: zero leakage, dual sealing. Generally, ordinary soft-sealed floating ball valves fail after just a few days of use, and the same thing happens with hard-sealed floating ball valves – they get stuck after not long. Recommended by someone, they turned to our company, which then customized this C-type fixed ball valve for them. It was installed, and several months have passed now; everything is working properly.
Fluorine gas, the gaseous form of the element fluorine, has the chemical formula F₂. It is pale yellow in color and extremely corrosive; it can even react with the highly unreactive element gold. Fluorine, a chemical element with the symbol F, is highly reactive and possesses strong oxidizing properties.
Given the high corrosivity of fluorine gas, what is the difference between using C balls and hard seals? Shouldn’t it still corrode?
Using PTFE sealing will prevent corrosion
The customer reported that the ball valve sealed with PTFE started leaking already the day after it was installed; upon disassembly, it was found that the PTFE valve seat was gone
Corrosion-resistant materials are used, but floating hard-sealed ball valves tend to get stuck after a while and stop functioning; I’m not sure exactly what causes this sticking. Ball C is fixed; as long as the ball is separated from the valve seat, it will not get stuck, so it can be used continuously
It’s because the design wasn’t proper; the valve seat lacks fire-resistant grooves for retention, which is why it leaks.
Perfluoroethylene should not react with fluorine; it shouldn’t be fully perfluorinated. Dry fluorine gas should work better, as well as high-purity quartz or Monel alloy.
This post was last edited by Qingshangniao2008 on 2023-7-10 at 08:07. So, what material is it this time? For example: What are the materials and specifications for the valve body, valve ball, valve seat, valve stem, valve body seal, and packing seal? Is the valve body lined with a material? Can I share it with everyone? Thank you