A pressure regulating system for a beverage container includes a first compartment for containing a pressurized gas. The first compartment is in fluid communication with a surrounding space through a gas valve for opening and closing a passage between the first compartment and surrounding space. A gas valve control system includes a deformable and/or movable wall or wall part, which is in contact with the gas valve for opening and/or closing the gas valve. A second compartment is provided at a side of the deformable and/or movable wall part. The movable and/or deformable wall part forms a wall of said second compartment and the second compartment forms a pressure regulating space and includes a wall part formed by or including at least a gas permeable, liquid tight permeable wall part.