Pre-charged vacuum fluid change/disposal apparatus

An apparatus for drawing waste fluid from a reservoir and refilling the reservoir with fresh replacement fluid, the apparatus comprising:

• a canister having first and second compartments, the first compartment being precharged by evacuating the first compartment to form a near absolute vacuum in the first compartment;
• means for drawing in the fresh replacement fluid into a second compartment of the canister;
• an air pressure inlet valve for charging the second compartment with air pressure to form a pressurized second compartment;
• a first hose connected between the first compartment and the reservoir;
• means for holding and releasing said near absolute vacuum from said first compartment in order to suction fluid from the reservoir through the first hose and into the first compartment without external power, the fluid thereby partially replacing the vacuum in the first compartment;
• and
• a second hose connected to the second compartment for delivering the fresh replacement fluid from the pressurized second compartment to the reservoir.

An apparatus for transferring fluid from an external reservoir and back to the same or another reservoir, said apparatus comprising:

• a prechargeable, sealable canister which may be evacuated to form a vacuum to be captured in the canister when the canister is disconnected from a vacuum source and which may also be pressurized to capture and hold a positive pressure in said canister when the canister is disconnected from a pressure source;
• one or more fluid conducting means in valved fluid conducting relationship with said canister and further in communication externally with an external reservoir;
• valve means for capturing said vacuum in said canister when the canister is disconnected from the vacuum source such that the vacuum may be controllably exposed to a fluid in another location;
• means for controllably releasing the captured vacuum in the canister so that the released vacuum suctions fluid from a reservoir through the fluid conducting means into the canister with the fluid thereby partially replacing the vacuum in the canister;
• pressurized fluid capturing means for capturing and holding fluid in said canister under pressure when the canister is disconnected from a pressure source, which pressurized fluid can be controllably transferred from the canister to an external reservoir;
• and means controllably releasing the pressurized fluid from within the canister for transferring fluid under positive pressure from said canister to a reservoir.