This actually happened to me on a gas welding tank, I went to turn ON the gas, the valve would not move, got a wrench, still would not move. Took the tank to the welding shop, I WAS TURNING THE VALVE THE WRONG WAY!!! Mistakes happen, take a look at the valve and double check the direction for on and off.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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