Carbon dioxide gas is transported in cylinders and sold in liquid form. CO2 has the property that it remains liquid under pressure and always flows downwards or settles at the bottom of the bottle. In the upper part of the bottle CO2 is gaseous.
When you connect a gas bottle “without a dip tube valve” to the cylinder and open the valve, it then transfers only gaseous CO2. The cylinder is not full with about 30-40gr gaseous CO2. If the large gas bottle is, however, reversed before the opening of the valve, then the liquid CO2 flows downward and is in front of the valve stub. As soon as the handwheel is opened, only the liquid CO2 flows into the cylinder. The cartridge is filled with liquid CO2.
A gas bottle with a dip tube valve, the principle is the same. The difference is, that bottles with this valve does not need to be turned. The valve connector is extended over a so-called syphon tube to the bottom of the bottle. Therefore, the valve is permanently at the bottom of the bottle liquid phase. When opening the valve only liquid CO2 leaves the gas bottle.