I have recently filled up my cannister with co2.

I released the main valve to open the supply of co2 gas, gas did come out then I quickly shut off the valve. It stopped the supply like it should but I felt a click in the valve like something had broken.

Now you can spin the valve freely both ways and nothing happens. It feels like it's no longer connected?

That is the valve I am referring too. Underneath this is another manual type of valve I assume. If I use a flathead screwdriver will the gas release or is it broken?