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Lp: 705 stainless steel laval nozzle.This kind of nozzle to make best use of the compressed air, the introduction of it created the new field of purging technology.This effect by is the center of a supersonic jet flow and a layer of protection around the center air laminar flow.The center of the 705 l air flow is generated by a laval nozzle.This kind of nozzle structure will be stored in the compressed air all the energy is converted into kinetic energy, and will not make the airflow in the transverse diffusion through the nozzle, laval ring groove around the hole the protective film can prevent the air around the center air flow deceleration, full purging, offset turbulent flow, thereby reducing the noise level.