Patent attributes
A non-overflow liquid delivery system comprises a pumping apparatus having a liquid delivery pumping portion and a liquid recovery pumping portion fluidically isolated one from the other. A nozzle has a liquid delivery conduit and a liquid recovery conduit. A liquid delivery hose connects the liquid delivery pumping portion of the pumping apparatus in fluid communication with the liquid delivery conduit. A liquid recovery hose connects the liquid recovery pumping portion of the pumping apparatus in fluid communication with the liquid recovery conduit. A valve has a first movable valve portion for opening and closing the liquid delivery conduit. A manually operable valve control mechanism is connected to the valve for controlling the first movable valve portion, and has a liquid sensor responsive to a threshold condition of liquid in the liquid recovery conduit to thereby cause the first movable valve portion to close the liquid delivery conduit.
