Color change system for spray coating apparatus

A color change system for supplying colors of coating materials to coating apparatus, comprising a material inlet to said system for connection with supplies of coating materials of selected colors;

• a material outlet from said system for connection with the coating apparatus;
• at least two pumps, each having an inlet and an outlet;
• means for cyclically and sequentially connecting individual ones of said pump inlets and outlets with said system material inlet and outlet, respectively, so that only one pump at a time provides a selected color of coating material to the coating apparatus;
• and means for connecting said pump inlets with a supply of solvent for the coating material when the same are not connected with the system inlet for receiving coating material, whereby only one pump at a time provides coating material while the other pumps are connected with solvent for continuously being cleansed of previously supplied coating material for as long as the one pump is providing coating material.

A color change system for supplying selected colors of coating materials to coating apparatus, comprising a material inlet to said system for connection with supplies of coating materials of selected colors;

• a material outlet from said system for connection with the coating apparatus;
• at least two pumps, each having an inlet and an outlet;
• means for cyclically and sequentially connecting individual ones of said pump inlets and outlets with said system material inlet and outlet, respectively, so that only one pump at a time provides a selected color of coating material to the coating apparatus;
• and means for connecting said pump inlets with a supply of solvent for the coating material when the same are not connected with the system inlet for receiving coating material, whereby only one pump at a time provides coating material while the other pumps are connected with solvent for being cleansed of previously supplied coating material, wherein said means for connecting said pump inlets with the supply of solvent includes means associated with each of said pumps for selectively establishing a path for recirculation of solvent between the outlet from and the inlet to the pump, and for connecting the supply of solvent with the path to introduce solvent therein when the pump is not connected with said system inlet for receiving coating material.

A color change system for supplying selected colors of coating materials to coating apparatus, comprising a material inlet to said system for connection with supplies of coating materials of selected colors;

• a material outlet from said system for connection with the coating apparatus;
• at least two pumps, each having an inlet and an outlet;
• means for cyclically and sequentially connecting individual ones of said pump inlets and outlets with said system material inlet and outlet, respectively, so that only one pump at a time provides a selected color of coating material to the coating apparatus;
• and means for connecting said pump inlets with a supply of solvent for the coating material when the same are not connected with the system inlet for receiving coating material, whereby only one pump at a time provides coating material while the other pumps are connected with solvent for being cleansed of previously supplied coating material, wherein the supplies of coating material are each of the type including an outlet line, a return line and a material supply pump for moving coating material from the supply and through the outlet line, said color change system further including means for connecting associated material supply outlet and return lines for continuous flow of coating material therethrough and through the material supplies irrespective of whether the coating materials are or are not connected with said system material inlet, thereby to continuously agitate the materials and prevent settling thereof.