Nozzle Flowmeter

Overview - How It Works
What it looks like in the pipe
  • Rounded, funnel-like inlet tapers off into a cylindrical throat which creates a pressure drop as flow passes through
Benefits / Limitations
  • Reduces turbulence
  • Provide long-term precise calibration
  • Pressure loss comparable to orifice plates
  • Suitable for higher flow velocities or for fluids with abrasive solid particles
  • Not recommended for highly viscous fluids or fluids with large amounts of sticky solids

Flow nozzles are comprised of two main sections: the rounded funnel-like inlet and the cylindrical throat that is mounted in the in the pipe with the funnel-like inlet facing the flow. They use a high pressure tap located before the inlet and a low pressure tap after the throat.

Flow nozzles are sometimes utilized to reduce turbulent flows. They result in a permanent pressure loss similar to that of an orifice plate. The exact contour of the flow nozzle is not critical for accurate measurement which provides a long-term calibration, even under severe conditions.

The flow nozzle can be used with a wide range of clean and dirty fluids including fluids with abrasive solid particles or where corrosion may be a concern. Additionally flow nozzles are often used for steam measurement or other high temperature and velocity fluids. Flow nozzles aren’t compatible with high viscosity fluids or fluids with substantial amounts of sticky solids.