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209 l, 208, 209, the improvement of nozzle series product, represents a new stage of purging technology.This effect is through the protection of the parallel to the center of jet gas film around the center of supersonic jet stream to get.Mixed distribution around the laval nozzle with divergent slots and holes, quiet, strong air laminar flow can be created.This kind of nozzle has extremely efficient scavenging capacity, the best use of compressed air.