Vacuum-controlled liquid delivery systems and methods for drawing a liquid into a syringe

A vacuum controlled liquid delivery method for filling a container, the method comprising:

• a) providing a vacuum controlled liquid delivery system, comprising:
• i) an air-tight receiving chamber, positioned within the chamber is an expandable container with a single access port for accessing an interior of the container for expanding the container lengthwise;
• ii) a fitting train in fluid communication with a liquid feed line, wherein the fitting train regulates passage of liquid through the single access port of the expandable container, the fitting train comprising a pair of detachable valves that selectively permit and prevent liquid delivery across the train when attached and when detached maintain a liquid-tight seal;
• iii) a vacuum pump;
• and
• iv) a set of control valves comprising a feed valve that regulates liquid delivery to the fitting train, a chamber vacuum valve that regulates vacuum inside the chamber to regulate vacuum forces against the housed expandable container to pull the liquid into the housed expandable container, and a feed line vacuum valve that regulates vacuum inside the feed line;
• b) connecting the feed line to a feed tank comprising a liquid for delivery;
• c) mounting the container to the fitting train so that the fitting train is in an open position;
• d) forming an air-tight seal within the receiving chamber;
• e) inducing a vacuum in the receiving chamber and in the feed line to position the container in a compressed state under vacuum forces;
• f) opening the feed line to fill the expandable container with the liquid under the vacuum forces until the container expands lengthwise to abut an upper wall of the chamber;
• g) closing the feed line valve;
• h) relieving the vacuum from the receiving chamber;
• i) closing the pair of detachable valves;
• and
• j) removing the container from the receiving chamber.