Oval Gear Flow Meter：Principles, Applications, and Advantages
Working Principle
Key Features
- High accuracy
- Particularly suitable for high-viscosity liquids (higher viscosity reduces leakage error, improving measurement performance)
- No upstream or downstream straight pipe sections required; flexible installation
- Measurement is largely independent of flow conditions
Applications
Advantages
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High measurement accuracy and good repeatability
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Wide turndown ratio, suitable for low-flow measurement
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Excellent performance with high-viscosity media (e.g., heavy oil, resins, syrups)
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Direct on-site reading available without external power supply (mechanical type)
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Strong resistance to flow field disturbances; unaffected by velocity distribution in the pipe
Limitations
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Cannot measure fluids containing solid particles (gears may jam); requires a filter at the inlet
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Entrained gas in the liquid causes significant measurement errors; a gas separator is required
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Not suitable for low-density media or low-pressure gases
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Limited pipe size,generally,bulky and heavy
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Gear wear, corrosion, or scaling over time affects accuracy; periodic calibration is required
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Narrow temperature and pressure range,high temperatures may cause thermal expansion and jamming
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Gear jamming can block the pipeline, posing a safety hazard
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Relatively high cost
Conclusion
Oval Gear Flow Meter are among the most accurate types of flow meters. They are particularly suitable for measuring the flow of high-viscosity media such as heavy oil, polyvinyl alcohol, and resins. Despite certain limitations, their high cost-performance ratio makes them a popular choice for many companies.
