Flow Meter

Venturi Flow Meter

Venturi flow meters are differential pressure flow measurement devices designed to measure liquid, gas, and steam flow with high accuracy and long-term stability. By utilizing a converging section, throat, and diverging section, the Venturi meter converts pressure energy into velocity energy, generating a stable differential pressure proportional to flow rate.

Instrava Venturi flow meters are engineered for harsh industrial environments where reliability, low maintenance, and minimal pressure loss are critical. With no moving parts and a robust one-piece or welded construction, Venturi meters provide consistent performance over long service life, even in high-pressure, high-temperature, or dirty process conditions.

  Flow Meter Description  

Venturi Flowmeter Features

  • High measurement accuracy and repeatability

  • Low permanent pressure loss

  • Suitable for liquids, gases, and steam

  • No moving parts, minimal maintenance

  • Stable performance under high pressure and temperature

  • Long service life

  • Wide range of pipe sizes available

  • Suitable for harsh industrial environments

These advantages make the venturi flow meter an ideal solution for critical industrial flow measurement applications.

Flanged Venturi flow meter for industrial pipelines
Venturi flow meter for industrial gas and liquid flow measurement

Venturi Tube Flow Meter Applications

Venturi flow meters are widely used in industries where stable flow measurement and low energy loss are required:

  • Power generation (steam, feedwater, condensate)

  • Oil & gas (process gas, liquid hydrocarbons)

  • Chemical and petrochemical processing

  • Water supply and wastewater treatment

  • Metallurgy and mining

  • Pulp & paper industry

  • Compressed air and industrial gas systems

Venturi Flow Meter Working Principle

The Venturi flow meter operates based on Bernoulli’s principle. As the fluid flows through the converging section, velocity increases and static pressure decreases. The pressure difference between the inlet section and the throat is measured and used to calculate the volumetric or mass flow rate.

Because the pressure recovery in the diverging section is high, the Venturi meter produces significantly less permanent pressure loss than traditional differential pressure flow devices.

Venturi flow meter working principle diagram
Venturi tube flow meter structure diagram

Venturi Flowmeters Structure & Design

A standard Venturi flow meter consists of:

  • Inlet (converging section) – accelerates the fluid

  • Throat – produces a stable low-pressure zone

  • Outlet (diffuser section) – recovers pressure efficiently

  • Pressure tapping ports – connect to differential pressure transmitter

The rigid structure ensures excellent resistance to vibration, erosion, and process pressure fluctuations, making it suitable for long-term industrial operation.

  Flow Meter Parameter  

ParameterSpecification
Nominal DiameterDN15 – DN1200 (Sizes above DN1200 available by negotiated order / customization)
Nominal Pressure≤ 42 MPa
Measurement Accuracy±0.5% ~ ±1.5%
Installation MethodFlanged connection, welded connection (customized options available)
Pressure Tapping MethodCorner pressure tapping (ring chamber or separate drilling), flange tapping, span tapping, or other customized configurations
Straight Pipe RequirementUpstream: 5–10D    Downstream: 2–5D

  Instrava OEM/ODM

Reliable Instruments. Solutions That Fit Your Application.

Instrava is focused on delivering reliable industrial solutions through carefully curated products, application-driven optimization, and flexible customization. We select proven instruments from trusted manufacturers to ensure consistent quality, optimize solutions based on real working conditions to solve practical challenges, and provide tailored configurations to meet specific application needs.

By combining selection expertise with application understanding, Instrava helps customers reduce risk, improve efficiency, and achieve dependable results in complex industrial environments.

Venturi flow meter manufacturing and testing in factory workshop

Yes. Venturi flow meters are well-suited for high-pressure systems due to their robust structure and absence of moving parts. With proper material selection and pressure rating design, they can operate reliably at pressures up to tens of MPa, making them ideal for power, oil & gas, and chemical processes.

For large-diameter pipelines, Venturi flow meters offer stable measurement, low permanent pressure loss, and long service life. Compared with orifice plates, Venturi meters reduce energy loss significantly, which is especially important in DN300 and above applications.

Venturi flow meters are widely used for steam measurement because they tolerate high temperature and pressure while maintaining stable differential pressure signals. Their smooth internal profile minimizes erosion and ensures long-term accuracy in saturated and superheated steam applications.

Venturi flow meters generate lower permanent pressure loss, are less sensitive to wear, and offer better long-term stability. In high-pressure, high-temperature, or dirty process conditions, Venturi meters require less maintenance and deliver more consistent performance than orifice plates.

Yes. Proper upstream and downstream straight pipe lengths help ensure stable flow profiles and accurate measurement. However, Venturi flow meters generally require shorter straight pipe lengths than many other differential pressure devices, making them suitable for compact installations.

Venturi flow meters perform reliably under fluctuating flow and load conditions due to their stable pressure recovery design. This makes them suitable for applications such as boiler feedwater, steam distribution, and industrial process control systems with variable operating conditions.

Why Choose Instrava

Built on Consistency, Not Claims

Focused on Industrial Applications

We specialize in industrial analysis and detection, with a clear understanding of real-world operating environments and requirements.

Strict Product Selection Criteria

Every instrument is evaluated based on performance, stability, and application suitability—not just specifications or pricing.

Reliable Supply & Quality Consistency

We work with trusted manufacturers to ensure stable supply, consistent quality, and dependable delivery.

Practical, Experience-Based Support

Our recommendations are grounded in application understanding, helping customers avoid common issues and achieve reliable results.

Instrava is built to reduce uncertainty—so every decision you make is clearer, safer, and more reliable.

Industrial measurement scene showing a worker using a precision measuring instrument to measure and mark material on a workbench, demonstrating the practical application of measuring instruments in manufacturing and processing.

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