초록 ▼

The solvent and air mixing system is used 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 includes at least two sources of liquid coupled to a mixer through respective control v

The solvent and air mixing system is used 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 includes at least two sources of liquid coupled to a mixer through respective control valves. An air solvent purging/cleaning system is provided including an air supply line and an air purge valve and a solvent supply line and a solvent purge valve coupled to the mixing and applying system or to a paint color changing system. A pneumatic valve control system is provided for controlling the supply of pressurized air to the air purge valve and for controlling the supply of solvent to the solvent purge valve. The solvent and air mixing system of the present invention includes 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 is mounted in the pressurized air supply line. A solvent valve is coupled to the solvent supply line and to the solvent and air mixing device and communicates with a transverse passageway that opens onto, and is in communication with, the air passageway in the solvent and air mixing device. Control structures are coupled to the solvent valve for controlling operation of the solvent valve and for controlling the amount of solvent delivered from the solvent valve through the transverse passageway to the air passageway in the solvent and air mixing device. Preferably, part of the control structure is the pneumatic valve control system.

대표청구항 ▼

[ What is claimed is:] [11.] A method for cleaning one side of a two liquid component mixing system or a paint color changing system with an air and solvent purging/cleaning system, the method including the steps of: (a) supplying purging air through an air purge line to at least one valve and line

[ What is claimed is:] [11.] A method for cleaning one side of a two liquid component mixing system or a paint color changing system with an air and solvent purging/cleaning system, the method including the steps of: (a) supplying purging air through an air purge line to at least one valve and line for cleaning same; (b) adding a small amount of solvent to the air purge line; (c) cleaning the lines and valves for the one liquid component with air combined with a small amount of solvent; and, (d) bleeding a small amount of air from the air purge line through an air bleed opening at a point upstream of the point of addition of solvent to the air purge line thereby to prevent contamination of the source of 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.