... a variety of sizes and shapes of the venturi nozzle, steel,aluminum, nylon and other materials jacket can ... will vary. Gas dynamics of venturi nozzle is better than straight-hole nozzle, the vortex is improvedor ceased to ... more than double the speed, efficiency than the straight-hole nozzle to increase 15% -40%, 20% lower abrasive consumption ... according to customer's request. Boron Carbide Nozzle