Venturis
Product Resources

Venturi Tubes

Flowell manufactures Venturi tubes for accurate, repeatable differential-pressure flow measurement in demanding service. Common applications include gas, liquid, steam, and process fluids where low permanent pressure loss and long-term stability matter. If you need help sizing or selecting a configuration, use our sizing support or contact us for a quote.

Looking for the full product lineup? Visit Flow Measurement Products.

Venturi Tube Types We Build

  • Flanged End Venturi Tubes for standard piping integration
  • Weld-In Venturi Tubes for permanent installations
  • Low-Loss Venturi Designs for pressure-sensitive systems

Compatible Services and Applications

Venturi tubes are widely used in municipal water systems, oil and gas, chemical processing, power generation, and industrial facilities. They are suitable for clean fluids as well as challenging services such as slurry or sludge, depending on design and material selection.

Materials and Construction Options

  • Carbon steel
  • Carbon steel with stainless-steel throat
  • Full stainless construction

Need custom machining or non-standard configurations? We support special builds through custom machine work.

Accuracy and Calibration

  • Uncalibrated accuracy: typically within +/- 1%
  • Calibrated accuracy: typically within +/- 0.25%

Accuracy depends on application conditions, installation, and DP instrumentation. If you are comparing DP primary elements, you may also want to review related products like flow nozzles and orifice plates.

Standards and Compliance

Flowell Venturi tubes are manufactured to meet applicable requirements from ASME and common differential-pressure flow measurement practices, including guidance referenced in ASME MFC-3M where applicable to the application and configuration. For standards reference, see ASME MFC-3M.

What You’ll Get From Flowell

  • Configuration guidance based on service, line size, and operating conditions
  • Material selection support for corrosion, temperature, and pressure requirements
  • Optional calibration support when higher accuracy is required
  • Responsive quoting and build support through Contact Us

Venturi Tube FAQs

What is a venturi tube used for?

A venturi tube is a differential-pressure primary element used to measure flow rate in a pipe. As fluid passes through the throat, velocity increases and pressure drops. That DP is used to calculate flow.

How accurate are Flowell venturi tubes?

Uncalibrated venturi tubes typically achieve +/- 1% accuracy. Calibrated builds can achieve approximately +/- 0.25% depending on application, installation, and instrumentation.

Which venturi configuration should I choose?

Configuration depends on line size, service, pressure drop limits, installation constraints, and maintenance requirements. Use our
sizing support or contact us with your operating conditions for selection help.

Request a Quote

Send your line size, fluid, pressure/temperature, and target flow range to Flowell and we’ll recommend the best venturi configuration for your application.