A closure device for a container of compressed gas, particularly a capsule having a water capacity in the range of (5) to 100ml, comprises a shut-off valve (122) and a pressure-reducing valve (120), particularly a pressure regulating valve. The shut-off valve (122) is on the lower pressure side of the pressure-reducing valve (120). The closure device may also comprise a fill valve (118) to enable the container to be recharged with gas.
