Valve selection
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Why is this type of valve chosen? Newly installed device
It should be due to high temperature; if it’s too low, stainless steel should be used
It is obvious that certain issues were taken into account during the design, such as ease of use and safety considerations.
The pipe temperature is too high or too low. Consider the role of protecting operators.
I’ve never seen such a valve before; from what I can see, the material that this valve controls needs to be isolated from the outside world. It’s likely that after construction, a casing will be used to seal off the moving and stationary sealing points of these pipeline valves. In the event of a leak, physical and chemical treatment is carried out inside the tank. This valve is not suitable for high temperatures nor low temperatures. It’s probably just an extended sleeve, with valves designed to match those in the isolation box.
It should be for the purpose of protecting the safety of the operators. The medium may be hot or pose certain hazards. You can upload the valve model, which will make it easier for everyone to understand.