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Oval Gear Flow Meter

Category: Gear Flow Meter

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Product Introduction:

The oval gear flowmeter is a type of positive displacement flowmeter used for precise continuous or intermittent measurement of liquid flow or instantaneous flow in pipelines. It is especially suitable for measuring the flow of high-viscosity media such as heavy oil, polyvinyl alcohol, and resin.

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Oval Gear Flow Meter for High-Accuracy Liquid Measurement & Custody Transfer

Designed for precision liquid measurement where accuracy matters most.

✔ Accuracy up to ±0.2% for billing & custody transfer
✔ Ideal for oil, fuel, and high-viscosity liquids
✔ Stable performance independent of flow profile

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→ Talk to an Engineer

What is an Oval Gear Flow Meter

An oval gear flow meter is a positive displacement (PD) flow meter designed for high-precision liquid measurement.

Each rotation of the oval gears represents a fixed volume of liquid, ensuring extremely accurate and repeatable results.

It is widely used in custody transfer and billing applications where measurement accuracy directly impacts cost and compliance.

As shown in the oval gear mechanism, each gear rotation displaces a fixed volume of fluid.

oval gear flow meter working principle showing positive displacement of fluid between gears

How Oval Gear Flow Meters Work (Positive Displacement Principle)

Each rotation displaces a fixed volume of fluid, ensuring high measurement accuracy.

Why Choose Oval Gear

When accuracy is critical, oval gear flow meters outperform most other technologies.

✔ Not affected by turbulence or flow profile
✔ No need for long straight pipe runs
✔ High repeatability for financial measurement
✔ Reliable in both low and high flow conditions

Unlike turbine or ultrasonic meters, oval gear meters deliver consistent results even in complex piping systems.

Accuracy Improves with Viscosity

Unique Advantage: Accuracy Improves with Viscosity

Unlike turbine meters, oval gear flow meters perform better with higher viscosity liquids.

✔ Internal leakage decreases as viscosity increases
✔ Measurement stability improves in heavy oil conditions

This means:

• More accurate results for fuel, oil, and lubricants
• Stable ±0.2% accuracy even up to 2000 mPa·s

While turbine meters struggle with viscous fluids, oval gear meters become more reliable.

How It Works

Inside the meter, two oval gears rotate under the force of the flowing liquid.

Each rotation displaces a fixed volume of fluid through the measuring chamber.

The rotation is transmitted to a mechanical counter or electronic sensor, providing:

• Total flow measurement
• Instant flow rate
• Signal output for automation systems

This ensures stable and highly accurate measurement.

Key Advantages

✔ High accuracy (±0.5%, up to ±0.2%)
✔ Excellent for high viscosity liquids
✔ Strong repeatability
✔ Wide flow range
✔ Low pressure loss
✔ Suitable for high temperature liquids
✔ Easy calibration and maintenance

Best Applications

• Fuel loading & unloading systems
• Oil depot custody transfer
• Chemical dosing and batching
• Food & pharmaceutical liquids
• Commercial liquid measurement systems

High-Pressure & Industrial Reliability

Designed for demanding industrial environments:

✔ Pressure rating up to 6.3 MPa
✔ Cast steel and stainless steel construction
✔ Resistant to hydraulic shock and valve impact

Ideal for:

• Fuel transfer pipelines
• Oil distribution systems
• High-pressure industrial applications

Material & Compatibility

Material Options:

• Cast Iron → General industrial liquids
• Cast Steel → High pressure environments
• Stainless Steel 304 / 316L → Corrosive & hygienic fluids
• Optional materials → For aggressive chemicals

Material selection ensures compatibility with different liquids and operating conditions.

Mechanical Counter Option

Mechanical Counter Version (No Power Required)

For remote or hazardous environments:

✔ No power supply required
✔ Direct local total flow display
✔ Pointer and totalizer available

Ideal for:

• Remote fuel depots
• Oil loading terminals
• ATEX hazardous zones

Avoid Costly Mistakes

Incorrect flow meter selection can lead to serious financial losses:

• Using turbine meter for viscous oil → large error
• Using ultrasonic for billing → insufficient accuracy
• No filtration → gear damage

⚠ In custody transfer systems, small errors can result in large financial discrepancies.

→ Talk to an Engineer before selection

Complete Measurement Solution

For optimal performance, we recommend:

• Flow meter filter → protects internal gears
• Air eliminator → removes gas from liquid

These components are essential for accurate custody transfer systems.

→ Ask us for a complete system solution

Compare gear flow meters:
/en/knowledge/compare/oval-vs-circular-gear-flow-meter/

Explore circular gear flow meter:
/en/products/flow-meter/circular-gear-flow-meter/

FAQ

Q: What is the difference between oval and circular gear meters?
A: Oval gear meters are designed for high-accuracy measurement and custody transfer.

Q: Can it measure viscous liquids?
A: Yes, it performs better with higher viscosity fluids.

Q: What accuracy can I achieve?
A: Standard ±0.5%, optional ±0.2%.

Q: Does it require straight pipe?
A: No, it is not sensitive to flow profile.

Need a high-accuracy flow meter for your application?

✔ Tell us your fluid, viscosity, and flow range
✔ Get expert recommendation within 10 minutes

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Technical Specifications

Accuracy: ±0.5% / ±0.2%
Pressure: up to 6.3 MPa
Temperature: -20°C to 200°C
Viscosity: 0.6 – 2000 mPa·s
Size: DN10 – DN200

Flow Range Selection

DN10 → 0.2 – 0.4 m³/h
DN50 → 6 – 24 m³/h
DN100 → 30 – 100 m³/h
DN200 → 68 – 340 m³/h