System for preventing spillage from containers during filling thereof

摘要

A system for preventing spillage from containers during the filling thereof includes an electrical circuit extending between one or more filling ports of the container and being connected with one or more liquid level sensitive switches within the container. A liquid dispensing apparatus for dispensing liquid into the container is coupled to the circuit so as to be enabled to dispense liquid into the container when the circuit is closed and to be disabled from dispensing liquid into the container when the circuit is opened. The circuit includes electrically isolated leads at each of the one or more filling ports that can be connected with each other so as to complete the circuit at that port when either the filling port is properly capped or the liquid dispensing apparatus is properly coupled to the port. The one or more liquid level sensitive switches complete the circuit as long as the level of the liquid within the tank is below a prescribed limit level and open the circuit when the level of the liquid within the container is at or above the prescribed level. The liquid level sensitive switches are preferably installed at vent openings of the container, and embodiments of the liquid level sensitive switches also function as shut-off valves to prevent liquid from escaping from the container through the vent openings when the tank is tipped over.