LUGB Vortex flow meter measuring in the flow of liquid of steam gas and low viscosity according to Carmen and Struhal relavant spiral produce and on the theory of the relationship .As show in picture In the meter body vertical insert a triangular prism root namely the happening of the bodywhen eddies of medium flow through the table body in triangular prism behind the alternate produce in opposite directions regular karman swirl its spiral separation and the flow of the medium frequency F speed by head is proportional to the V detected the number of spiral can measure the flow velocityagain according to the table body mouth.