Pressure package system

An article for pressurizing a fluid to be delivered, comprising:

• a product chamber configured to hold the fluid,
• a working propellant chamber having an expandable wall in contact with the fluid and configured to hold a propellant at a working pressure, at least a portion of a first side of the expandable wall bounding at least a portion of the working propellant chamber, at least a portion of a second side of the expandable wall, facing away from the working propellant chamber, bounding at least a portion of the product chamber such that the fluid is separated from the propellant, and the working propellant chamber having an opening,
• a reservoir propellant chamber configured to hold the propellant at a pressure higher than the working pressure,
• a pressure controller in a fluid connection between the working propellant chamber and the reservoir propellant chamber, the pressure controller being disposed within the reservoir propellant chamber and comprising a reference pressure chamber confining a gas at a reference pressure, the reference pressure determining the working pressure in the working propellant chamber, and
• a cylinder in the reservoir propellant chamber having first and second open ends, the first open end connecting to the opening of the working propellant chamber, and the second open end being closed off by the pressure controller;
• wherein, expansion of the expandable wall applies pressure to the fluid held within the product chamber and, upon release of fluid from the product chamber, the expandable wall of the working propellant chamber is configured to expand against the remaining fluid and the pressure controller is configured to deliver propellant from the reservoir propellant chamber to the working propellant chamber to keep the working pressure within the working propellant chamber substantially constant.

An article for pressurizing a fluid to be delivered, comprising:

• a product chamber comprising a fluid to be delivered,
• a working propellant chamber having an expandable wall in contact with the fluid and comprising a propellant at a working pressure, at least a portion of a first side of the expandable wall bounding at least a portion of the working propellant chamber, at least a portion of a second side of the expandable wall, facing away from the working propellant chamber, bounding at least a portion of the product chamber such that the fluid is separated from the propellant, and the working propellant chamber having an opening,
• a reservoir propellant chamber comprising the propellant at a pressure higher than the working pressure,
• a pressure controller in a fluid connection between the working propellant chamber and the reservoir propellant chamber, the pressure controller being disposed within the reservoir propellant chamber and comprising a reference pressure chamber confining a gas at a reference pressure, the reference pressure determining the working pressure in the working propellant chamber, and
• a cylinder in the reservoir propellant chamber having first and second open ends, the first open end connecting to the opening of the working propellant chamber, and the second open end being closed off by the pressure controller;
• wherein, expansion of the expandable wall applies pressure to the fluid held within the product chamber and, upon release of fluid from the product chamber, the expandable wall of the working propellant chamber expands against the remaining fluid and the pressure controller delivers propellant from the reservoir propellant chamber to the working propellant chamber to keep the working pressure within the working propellant chamber substantially constant.