Flame never travels back to Cylinder in a Gas Stove - Why??

       Have you ignited your gas stove? Sure you would have or at least you should have seen someone doing so. Has this question sparkled in your mind ever. Why does the Flame on the burner never travels back to the cylinder?? It looks like there is a Flame at the Tail of a tanker. But the Arrangement is completely safe.

      Lets see what our Engineers have done inside to keep the Cylinder safe from exploding.
I have explained   about the process of Fire in my post Tank full of fuel will never EXPLODE!!. Oxygen or Air is very necessary for Fire.

      Our gas cylinders are filled with Petroleum Gas under high pressure. There is a pressure reducer which reduces the pressure of the gas and from here gas travels to the burner through a Hose. As already mentioned, air is required for combustion. Air gets mixed up into the gas stream just before the burner through an Air hole (If you turn your stove upside down you will find this hole just before the burner). If you block this hole, the flame will stop burning, please don't try because petroleum gas will start filling you room.

       The answer is that gas travels from high pressure cylinder to atmospheric pressure and also air is not available for the gas in the cylinder.