I went to open my co2 tank today to hook up two beers I just kegged and i can't turn the knob and it actually broke while I was trying to open it. Any clue why a co2 tank wouldn't open?
It's not common, but the valves can seize sometimes, and I don't know of any fix other than replacing. Did you buy the tank and have it filled, or do you do tank swaps? Either way, I'd suggest taking it back to whoever filled/swapped it for you.
always counterclockwise to open a valve. look to see if the stem looks high- maybe it's already open and empty - this happens a lot when we get tanks at work.