As you say,different tungsten carbide nozzles have different shapes,The shape of the carbide nozzle hole determines its airflow pattern. The nozzle generally has a straight hole or a restricted hole, a hillock hole.
Such as,1.Straight hole.2.Traditional long hill design 3.Double Venturi 4.Wide throat nozzle
Commonly used nozzle materials include cast iron, ceramics, tungsten carbide, silicon carbide, boron carbide. And these special materials to do the nozzle is also a different shape.
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