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.
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 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
| Parameter | Specification |
|---|---|
| Nominal Diameter | DN15 – DN1200 (Sizes above DN1200 available by negotiated order / customization) |
| Nominal Pressure | ≤ 42 MPa |
| Measurement Accuracy | ±0.5% ~ ±1.5% |
| Installation Method | Flanged connection, welded connection (customized options available) |
| Pressure Tapping Method | Corner pressure tapping (ring chamber or separate drilling), flange tapping, span tapping, or other customized configurations |
| Straight Pipe Requirement | Upstream: 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.
Related Product Recommendations
Can Venturi flow meters be used for high-pressure applications?
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.
Why are Venturi flow meters preferred for large-diameter pipelines?
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.
How does a Venturi flow meter perform in steam flow measurement?
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.
What advantages do Venturi flow meters have over orifice plates in harsh conditions?
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.
Are straight pipe requirements critical for high-accuracy Venturi measurement?
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.
Can Venturi flow meters handle fluctuating flow and load conditions?
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.
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