Have a couple of rusty rads to swap on a system. Like for like same side. Would you swap the valves and drain down. Or leave the valves so don't have to drain down?
If the valves are good and hold water back, why change what doesn't need changing. If they are not good and do not hold up, I'd drain and change all of the system's valves in one go to save down time in the future.
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