Pressure regulating system for a beverage container and beverage container provided therewith

A pressure regulating system for a beverage container system, comprising a first compartment for containing a pressurized gas, in fluid communication with an outlet space through at least a gas valve for opening and closing a passage between the first compartment and the outlet space, wherein a gas valve control system is provided, comprising a deformable and/or movable wall or wall part of said outlet space, wherein said deformable and/or movable wall or wall part is operably in contact with said gas valve for opening and/or closing said gas valve, wherein a second compartment is provided at a side of the said deformable and/or movable wall or wall part opposite the outlet space, wherein the second compartment is in fluid communication with a third compartment, which third compartment comprises at least one separating wall part and is at least liquid tight, and wherein the separating wall part comprises at least a movable and/or deformable wall part allowing increase and decrease of an internal volume of the third compartment, wherein the movable and/or deformable wall part of the second compartment allows for an increase and decrease of the volume of the second compartment, wherein the fluid connection between the second and third compartment is designed such that a change in volume of the second compartment leads to a volume change of the third compartment with a time lag and vice versa.