What is the purpose of this flexible connection on the valve?
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Including that, what’s the use of having pipes connecting the sections together?
It looks like a jumper with a jacket for insulation
Find the equipment user manual or drawings for reference.
It is speculated that it is a sleeve used to heat the pipeline with steam or hot oil.
This is the connection branch for the jacket valve, used to heat or cool the valve
For jacketed heating, just touch it to see if it’s hot and you’ll know
For jacket cooling or insulation. If it has insulation, then it’s used for insulated heating. If there is no insulation, it is used for cooling. It was a jacketed valve
It seems to be the backflow cross-line before and after the valve
This is a jacketed valve, and the hose is used for heat transfer