Maximum operating temperature of the PTFE seal in high-temperature ball valves
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The bottom valve of the reaction tank is a ball valve; the sealing elements keep having problems and causing leaks. Although they are made of PTFE, they cannot be used for long periods in materials at 230 degrees Celsius. What high temperature can tetrafluorine seals actually withstand?
Using PPL material for sealing can achieve your target temperature; PTFE is not suitable for high temperatures.
The long-term operating temperature for tetrafluoride should be ≤180℃
I think if you’re dealing with high temperatures and have low requirements for leakage, you can use a hard-sealed version
Was the problem solved? If necessary, sealed samples resistant to 300-degree high temperatures can be provided for testing!
For such high temperatures, use a hard-sealed ball valve
But to make it better, around 50 are needed, and the cost is too high.
If conditions permit, hard-sealed ball valves can be considered; R-PTFE material can be used, as well as PEEK PPL material. The downside is that the torque will increase. For reference only!
If high temperatures need to be tolerated, it is recommended to use hard-sealed ball valves. If the cost is a concern, a blind flange can be installed at the valve outlet; however, this increases the workload and will certainly meet with resistance from the staff.