Abstract: Gas to be stored flows along a gas feed line and into a cylinder containing a solvent for the gas. During its passage along the gas feed line, the gas flows through a dosing device which, on the one hand, permits a substantially adiabatic expansion and concomitant cooling of the gas to occur and, on the other hand, automatically regulates the flow rate of the gas in dependence upon the pressure difference across the dosing device. The pressure upstream of the dosing device is maintained constant regardless of the pressure downstream thereof, which latter pressure is variable due to the fact that dissolution of the gas generates heat and an accompanying increase in the pressure inside the cylinder. The constant pressure upstream of the dosing device is slightly higher than the final pressure inside the cylinder when the latter has been filled.