Bubbler container automatic refill system

Claim 1

In an automatic refill system for refilling a working container with ultra high purity liquid chemical from a bulk supply chemical container via a liquid chemical infeed line, the bulk supply chemical container having an open top and a closed bottom, an improved bulk supply chemical container connection apparatus connected to the top of the bulk supply chemical container comprising in combination: (a) a bulk supply container support shelf in the top of the bulk supply container; (b) a support fitting that removably engages the bulk supply container support shelf; (c) a threaded receiving portion mounted to the bulk supply chemical container; (d) a threaded coupling that threadingly fits the threaded receiving portion, the coupling being sealable by a removable cover; (e) a quick disconnect connection connected to the liquid chemical infeed line and connectable to the bulk supply chemical container at the threaded coupling by fitting thereinside; (f) securing means cooperative with the threaded coupling to secure the quick disconnect connection thereto; (g) a spring loaded check valve connected to the liquid chemical infeed line; (h) a liquid chemical output supply line connected to the quick disconnect connection and to the top of the bulk supply container extending down into the bulk supply container and toward the closed bottom; (i) a first shutoff valve connected to the liquid chemical output supply line intermediate the top of the bulk supply chemical container and the quick disconnect connection; (j) a gas pressure supply line connected to the quick disconnect connection and the top of the bulk supply chemical container; and (k) a second shutoff valve intermediate the top of the bulk supply chemical container and the quick disconnect connection, the first shutoff valve on the liquid chemical supply line and the second shutoff valve isolating the bulk supply chemical container to prevent contamination from occurring to the liquid chemical upon connection and disconnection of the bulk supply chemical container from the automatic refill system.