In Mesa, AZ this last Feb, a fix-it guy used a teflon-lubricant-grease sort of stuff to replace our P/T valve. He said that it didn't freeze up the valve for its next removal. He was against using teflon tape (which - my opinion-is great stuff) because it did freeze fixtures/valves, etc.
It sounds like yours is a "clean the threads, use the right lubricant" problem.
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