This is how I recover the brass valves from discarded propane tanks, ONLY USE A PLASMA for this task as an oxygen flame has too much unused gas left. The plasma uses compressed air making a cut like this safer.
When you cut the top ring off, cut away from the tank, those new safety valves will not permit evacuation of any propane when the hose is disconnected.
If there is any great amount of propane left inside the tank it gets put aside for use, elsewhere.
After hitting the valve with a hammer after a couple of turns you may hear some gas hissing, leave the tank aside until the gas has evacuated before removing the valve entirely.
Regards
Gustavus
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