Venturi Flowmeter
Proven differential pressure technology delivering ±0.75% to ±1% accuracy with 90% pressure recovery—the gold standard for clean liquid and gas flow measurement where long-term reliability and minimal energy loss matter.
Specifically designed for "difficult-to-measure" fluids, our Inner Venturi Tube thrives where standard meters fail. From unclean natural gas and coke oven gas to dirty liquids containing bubbles or solid particles, its aerodynamic coaxial design prevents clogging and maintains signal integrity. It is the definitive choice for petroleum and chemical industries looking for a rugged, maintenance-free solution for contaminated media.
- Nominal Diameter: DN25 to DN1500
- Flow Accuracy: ±0.75% to ±1% of reading
- Temperature: -200°C to +450°C
- Pressure Loss: ~1/5 of Differential Pressure (1/3 of Orifice Plate)
- Measurement Range Ratio: 10:1
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Superior Energy Efficiency and Long-Term Reliability
Parameter | Specification |
|---|---|
Measurement Principle | Differential pressure (Venturi effect) |
Applicable Standards | ISO 5167-4, ASME MFC-3M, API MPMS Ch 5.3 |
Pipe Size Range | DN50 – DN3000 (2" – 120") |
Flow Accuracy | ±0.75% to ±1% of reading (per ISO 5167-4) |
Repeatability | ±0.1% of reading |
Turndown Ratio | 1:10 to 1:15 (depending on ΔP transmitter range) |
Reynolds Number Range | Re > 200,000 (fully turbulent flow) |
Pressure Loss | 0-15% of generated differential pressure (permanent loss) |
Pressure Recovery | 85-90% of differential pressure recovered |
Fluid Temperature | -200°C to +450°C (material and construction dependent) |
Operating Pressure | Up to 42 MPa (PN420) depending on material and design |
Measured Fluids | Clean liquids, gases, steam (single-phase flow only) |
Venturi Throat Diameter Ratio (β) | 0.3 to 0.75 (d/D ratio) |
Convergent Cone Angle | 21° ± 1° (standard) |
Divergent Cone Angle | 7-15° (optimized for pressure recovery) |
Straight Pipe Requirements | 10-30D upstream (depending on upstream fitting), 5D downstream |
ΔP Transmitter | Smart DP transmitter (not included, user-supplied) |
Flow Computer | Optional (calculates mass/volume flow from ΔP, pressure, temperature) |
Manufacturing Tolerance | Throat diameter ± 0.05%, cone angles ± 1° |
Custody Transfer | Approved for fiscal metering (with calibration certificate) |
Venturi vs. Orifice Plate, Magmeter, and Vortex
vs. Orifice Plate Flowmeters:
- 80-90% lower permanent pressure loss (lower energy costs)
- No sharp edges to erode or degrade
- 20-30 year stability vs. 2-5 year plate replacement
- Better accuracy in slightly dirty service
- Higher initial cost (payback in 18-24 months via energy savings)
- Longer installation length
vs. Electromagnetic Flowmeter
- No electronics in process (higher reliability in harsh environments)
- Works with non-conductive fluids
- Higher temperature capability (-200°C to +450°C)
- Lower total cost of ownership over 20 years
- Requires minimum straight pipe (magmeter more flexible)
- Permanent pressure loss (magmeter has zero)
vs. Vortex Flowmeter:
- No moving parts or electronics in process
- Better accuracy (±0.75% vs ±1%)
- Works in very high pressure (42 MPa vs 4 MPa)
- No vibration sensitivity
- Higher pressure drop than vortex
- More straight pipe required
Best Applications for Venturi Flowmeter:
- High-value long-term installations (20-30 year design life)
- Custody transfer requiring ISO 5167 traceability
- High-pressure or extreme temperature service
- Applications where pumping cost matters (continuous operation)
- Clean liquids, gases, or steam (single-phase flow)
Precision Flow Measurement Across Critical Industries
Venturi reliability for custody transfer, process control, and energy management
Unclean Natural Gas & Coke Oven Gas
The primary solution for "dirty" gas measurement. The aerodynamic core prevents the accumulation of tars or impurities, providing stable flow data for petrochemical plants and steel refineries where other meters fail.
High-Pressure Steam & Energy Auditing
Optimized for saturated and superheated steam in power generation and district heating. Its low pressure-loss profile and mass-flow calculation capabilities ensure precise thermal energy tracking with minimal energy waste.
Mining Slurries & Bubbled Liquids
Effectively manages fluids containing solid particles or gas bubbles. The Inner Venturi’s unique flow path ensures that impurities pass through without clogging or damaging the primary element.
Large-Caliber Municipal Water Distribution
Applied in massive pipelines up to DN1500. Its rugged construction and low-cost-of-ownership make it the most efficient technology for large-scale water conservancy and municipal drainage infrastructure.
Space-Constrained Process Retrofits
The definitive choice for existing plants where pipeline space is limited. Its 3D/1D straight pipe requirement allows for high-precision measurement points to be added to crowded mechanical rooms without expensive piping modifications.
Reduce Energy Costs With Accurate, Low-Loss Flow Measurement
Get permanent pressure loss 80% lower than orifice plates. Specify your application today—receive Venturi sizing, pressure loss calculations, and ROI analysis within 24 hours.
info@hbmeter.cc
(+86) 152-3780-0315
1 Jingsan North Road, Xiangfu District, Kaifeng, Henan 475004 China
About HBmeter
AFT Instruments is a high-tech manufacturer delivering precision flow instrumentation for water, chemical, power, industrial automation, and process industries.
View moreContact Us
info@hbmeter.cc
(+86) 152-3780-0315
(+86) 152-3780-0315
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