Pressure control system

1. A high-pressure plastic vessel for use in a pressure control system provided for maintaining a constant predetermined excess pressure in a fluid dispensing container, said high-pressure vessel comprising an inner chamber, a closed end at the bottom and an open end on top, and a pressure control device with a valve, wherein the pressure control device is mounted on the open end on top of the high-pressure vessel, whereas a passageway is provided from the inner chamber to an outside of the high-pressure vessel, which passageway is controlled by the valve, wherein the high-pressure vessel comprises:

an upper portion and a lower portion, said upper portion having an essentially half-spherical form and said lower portion having an essentially cylindrical form and comprises at least three outstanding lobes having a triangular-shaped base, wherein the upper and lower portions essentially have the same height and are both made by injection blow moulding from extruded PET, and being connected to one another by a ring-shaped member to form the high-pressure vessel, wherein the lower end of the lower portion integrally forms the bottom of the high-pressure vessel.

2. The high-pressure plastic vessel according to claim 1 , wherein the ring-shaped member comprises a middle ring part protruding outwards from another part of the ring-shaped member for receiving the upper and lower portions.

3. The high-pressure plastic vessel according to claim 2 , wherein the ring-shaped member comprises carbon black and is connected to the upper and lower portions by laser-welding.

4. The high-pressure plastic vessel according to claim 2 , wherein the ring-shaped member is glued to the upper and lower portions.

5. The high-pressure plastic vessel according to claim 4 , wherein the ring-shaped member is glued by a hot melt glue to the upper and lower portions.

6. The high-pressure plastic vessel according to claim 1 , wherein the neck portion of the top opening of the high-pressure vessel is reinforced.

7. The high-pressure plastic vessel according to claim 6 , wherein the neck portion comprising two parallel reinforcing rings.

8. A fluid dispensing container comprising a pressure control system using a high-pressure plastic vessel according to claim 1 , wherein the high-pressure vessel is mounted on a bottom side on a support and the fluid dispensing container is mounted also on the bottom side to the support, such that the container is surrounding the pressure vessel creating a spherical space containing a fluid to be dispensed.

9. The fluid dispensing container according to claim 8 , wherein the high-pressure vessel and the dispensing container have an ellipsoid shape.

10. A fluid dispensing container comprising a pressure control system using a high-pressure plastic vessel provided for maintaining a constant predetermined excess pressure in the fluid dispensing container, said high-pressure vessel comprising an inner chamber, a closed end at the bottom and an open end on top, and a pressure control device with a valve, wherein the pressure control device is mounted on the open end on top of the high-pressure vessel, whereas a passageway is provided from the inner Chamber to an outside of the high-pressure vessel, which passageway is controlled by the valve, wherein the high-pressure vessel has a stretched ellipsoid shape, which is made by injection blow moulding from a preform of extruded PET,

wherein the high-pressure vessel is mounted on a bottom side on a support and the fluid dispensing container is mounted also on the bottom side to the support, such that the container is surrounding the pressure vessel creating a spherical space containing a fluid to be dispensed.