Stuck Water Supply Nipple

Any tips on how to un-stuck a very tight (and old and rusty...) plumbing valve from it's nipple? It is orig plumbing and house is 45 years old.
Valve is leaky so I have no choice but to redo plumbing.
TIA
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Oceans 2K wrote:

Heat the valve with a torch; it will expand slightly and let go (maybe).
If saving the nipple is a must, saw thru the valve body where the threads are. Saw lengthwise (direction of the pipe) or as near to that as you can. Don't saw *into* the pipe threads, just right up to them. Then split the valve body with a cold chisel or maybe just a screwdriver twisting in the sawed slot. You only need a tiny bit of "give" to be able to unscrew the nipple.
Jim
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The saw worked. My trusty Lenox hacksaw always comes through in a pinch.
Thanks
TC

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Oceans 2K wrote:

Spray all surrounding woodwork with water. Keep your sprayer on hand, just in case... Shoot the joint with Liquid Wrench. Apply flame from a propane torch to the *female* half of the joint, and it'll expand and break free of the nipple.
Note that pipe threads are cut tapered. If you can turn a fitting 1/4 turn with a wrench, you can turn it the rest of the way (hopefully) by hand.
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