Patent ID: 6499632
Filing Date: 2002-12-31
Classification: B65D,Y10T

Abstract:
A fluid dispensing assembly comprising:a container having a container axis and enclosing an inner space, the inner space having an upper part that contains a fluid to be dispensed and a lower part having a container pressure; and a pressure control device positioned within the container and including a first sealing ring configured to separate the upper and lower parts, the pressure control device configured to move along said container axis such that a volume of said upper part is decreased as said fluid is dispensed, said pressure control device comprising: a first housing forming a first chamber occupied by a first gas at a first chamber pressure that is higher than said container pressure, the first chamber having a normally closed first opening; a second housing having a closed first end and a second end forming a second opening, the second housing being connected to said first housing and accommodating a second chamber; and a closing member configured to move along the container axis within said pressure control device, a first end of said closing member configured to operate said first opening depending on an axial position of the closing member within the pressure control device, a second end of said closing member cooperating with said second housing to form said second chamber, said second chamber exerting a pressure on the closing member in a direction of said first chamber; and wherein said first opening is released upon axial movement of the closing member in response to a decrease in the container pressure of the lower par, thereby forming a fluid connection between the first chamber and the lower part so as to allow gas from the first chamber to enter the lower part and increase the container pressure.