I've always taken them apart when that's possible. When it's not, I've sometimes wrapped a wet rag around the center of the fitting before soldering. I have no way of determining whether it helps, but if the rag is still steaming (not completely dried out) when I get a good soldered joint I figure it's probably provided some cooling at that location.
The problem with damaged valves is that they usually work fine in the open position. A valve that is permanently open during normal use---the shut off for the supply side on a water heater, for instance---may not let you know that it's not going to work just when you really need it.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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