Patent ID: 7293720

Claim:
A paint system comprising a paint supply station, a paint supply channel downstream of the paint supply station, the paint supply channel having a number of supply nodes, a paint return channel upstream of the paint supply station, the paint return channel having a number of return nodes, and a number of paint circulation lines, wherein the number of paint circulation lines includes: a first paint circulation line including a first coupling for connecting a first paint output nozzle assembly thereto, the first paint circulation line being positioned downstream of the paint supply channel at a first supply node of the number of supply nodes, the first paint circulation line being positioned upstream of the paint return channel at a first return node of the number of return nodes, the first paint circulation line further comprising a flow induced pressure generating portion including one or more first lengths of coiled tubing for developing a first differential pressure in the first paint circulation line, the first differential pressure being proportional to the magnitude of paint flow therein, first length of coiled tubing being shaped to generate sufficient differential pressure to provide an operative first pressure differential at the first paint output nozzle assembly, and a second paint circulation line including a second coupling for connecting a second paint output nozzle assembly thereto, the second paint circulation line being positioned downstream of the paint supply channel at a second supply node of the number of supply nodes, the second paint circulation line being positioned upstream of the paint return channel at a second return node of the number of return nodes, the second paint circulation line further comprising a second flow induced pressure generating portion including at least one second length of coiled tubing for developing a second differential pressure in the second paint circulation line, the second differential pressure being proportional to the magnitude of paint flow therein, the second length of coiled tubing being different from the first length of coiled tubing and being shaped to generate sufficient differential pressure to provide an operative second pressure differential at the second paint output nozzle assembly, wherein each paint circulation line is substantially free of a component of sufficient size to cause accumulation of settled paint solids that cause at least one of pressure changes of a magnitude requiring system recalibration or settled solids to be deposited on a painted surface to a degree requiring remedial repair.