A pressure regulating system 12 for a beverage container 2, comprising a first compartment 11 for containing a pressurized gas, in fluid communication with a surrounding space through at least a gas valve 13 for opening and closing a passage between the first compartment and surrounding space, wherein a gas valve control system is provided, comprising a deformable and/or movable wall or wall part 17, wherein said deformable and/or movable wall part is operably in contact with said gas valve for opening and/or closing said gas valve 13, wherein a second compartment 15 is provided at a side of the said deformable and/or movable wall part 17, said movable and/or deformable wall part 17 forming a wall of said second compartment 15, wherein the second compartment 15 forms a pressure regulating space and comprises a wall part formed by or comprising at least a gas permeable, liquid tight permeable wall part 24.