The invention relates to a valve assembly arranged in a bottle openings of a cylinder, including a valve shell, which has a first and second housing ends, a first and second housing openings arrangedat the end of the corresponding housing, and a hole extending between the opening of the shell. The first opening has an inner diameter, a hole with an inner surface, and an inner valve arranged in the hole. The inner valve unit has the inner valve housing and the first end and the second end. The first end has an outer diameter, and the outer diameter is larger than the inner diameter of the first opening. The first end is connected to the inner surface of the first opening. The filling valve is formed, the second end includes the entrance to the inner valve unit, and the inner surface of theopening is filled with the seat. The inner valve unit also includes the consumption valve at the first end, the first pressure relief valve and the residual pressure valve to reduce the pressure in the cylinder from the first gas pressure to the second gas pressure, and the residual pressure valve is arranged downstream of the first pressure relief valve. The invention also relates to a gas cylinder, a gas delivery system, a gas consumption system and a beverage dispensing system.