Patent ID: 6116261
Filing Date: 2000-09-12
Classification: B01F,B05B,B08B,Y10T

Abstract:
A solvent and air mixing system for use in an air solvent purging/cleaning system for an at least two liquid component mixing and applying system or a paint color changing system; the mixing and applying system including at least two sources of liquid coupled to a mixer through respective control valves; said air solvent purging/cleaning system including an air supply line and an air purge valve and a solvent supply line and a solvent purge valve; means for supplying pressurized air to the air purge valve; means for supplying solvent to the solvent purge valve; and a pneumatic control system for controlling the operation of the air solvent purge system including control of the air purge valve and the solvent purge valve; said solvent and air mixing system including a solvent and air mixing device having an air passageway coupled into the supply line for supplying pressurized air to the air purge valve; an air bleed backflow device mounted in said pressurized air supply line for bleeding air and backflow liquid out of said air supply line to prevent contamination of said means for supplying pressurized air in the event of a breakdown in said purging/cleaning system that results in backflow of liquid through said solvent and air mixing system; a solvent valve for controlling delivery of solvent to said solvent and air mixing device, said solvent valve having an inlet coupled to the means for supplying solvent and an outlet coupled to said solvent and air mixing device air and communicating with a transverse passageway in the solvent and air mixing device that opens onto said air passageway in said solvent and air mixing device; means coupled to said solvent valve for controlling operation of said solvent valve; and means for controlling the amount of solvent delivered from said solvent valve through said transverse passageway to said air passage in said solvent and air mixing device.