Patent ID: 7748578

Claim:
A pressure control device for maintaining a constant predetermined excess pressure in an inner space of a fluid dispensing container, the pressure control device comprising: a fluid dispensing container having an inner space and a first chamber, the first chamber having a wall separating the inner space from the first chamber, and the wall having a first opening; a cylinder having a closed first axial end and an open second axial end, the second axial end being adapted for fluid communication with the first chamber by means of a second opening different from the first opening; a closing member comprising a plunger having a stem axially extending from one axial end of the plunger, wherein a free end of the stem defines a first subsurface and an axial end of the plunger opposite the stem defines a second subsurface, the closing member being engaged for axial movement in the cylinder and defining a second chamber between the second subsurface on the opposite axial end of the plunger, and the first axial end of the cylinder, the stem being configured to form a valve; a fluid connection extending between the first chamber and the inner space of the fluid dispensing container; a sidewall of the cylinder, at a position located outside the second chamber, being provided with an opening through which said fluid connection is adapted to extend to the inner space of the fluid dispensing container; and a resilient pressure element biasing the closing member into an open position of the valve.