Patent ID: 7708171

Claim:
A pressure control device in a pressure control system for maintaining a constant predetermined excess pressure arranged in a fluid dispensing container, said pressure control device comprising: a cylinder having an open end and a closed end, and a piston movable within said cylinder defining a first chamber to be filled with a gas for exerting said predetermined excess pressure, a second chamber, a passageway from the second chamber to the outside of the device leading to the fluid dispensing container, and a valve for releasing and closing said passageway, wherein the second chamber is formed by a high-pressure container with a closed end and an open end provided with a rim part and said high-pressure container being filled with a gas at a pressure higher than said predetermined excess pressure, said piston having means for actuating said valve dependent from the pressure difference between the first chamber and the fluid dispensing container, so that if the fluid pressure in the fluid dispensing container drops below the predetermined excess pressure, gas flows from the second chamber to the fluid dispensing container until the container pressure approximately equals said predetermined excess pressure, and further wherein a closure is mounted to the rim part of the high-pressure container in order to close the second chamber, wherein the first chamber is part of the closure, such that the high-pressure container encompasses the cylinder of the first chamber.