A pressure control system provided for maintaining a constant predetermined excess pressure in a fluid dispensing container (17) is described, which comprises a high-pressure plastic vessel (16) having an inner chamber, and a pressure control device having a valve and mounted on the open end of the high-pressure vessel, whereas a passageway (11) is provided from the inner chamber to the outside, which is controlled by the valve. A piston (2) with a protruding stem (3) is provided in a guide member (5), whereas between the guide member (5) and the piston (2) a chamber (8) with a gas with a reference pressure smaller than the high pressure is enclosed, and the high pressure vessel (16) is closed by a closure (9) with a central bore (10) of smaller diameter than the diameter of the stem (4), and the piston end remote from the protruding stem (3) is pressurized by the fluid in the fluid dispensing container (17).
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