Discussion on the tower configuration in the methanol four-tower process?

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I have been gathering information on this topic recently, and I’ve seen many different types. These days, both pre-treatment towers and pressure towers use packing, usually in the form of wire mesh corrugations or perforated plate corrugations. Are packing materials generally used in the distillation sections of the latter two towers, while floating valve trays are used in the stripping sections? Let’s discuss what type of floating valve is used in the latter two stripping sections What are the criteria for choosing between trapezoidal guide float valves, rectangular guide float valves, and toothed guide float valves? We use trapezoidal guide floating valves. Also, what are the typical sizes for float valves in these various forms? Are there any special requirements for the wall thickness of the valve material? How many mm are generally used? What is the weight of a valve approximately? Thank you.