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Circular Gear Flow Meter for Precise Low-Flow Liquid Measurement
High-precision circular gear flow meters designed for stable measurement of clean liquids and low flow rates.
✔ Ideal for oil, fuel, and lubrication systems
✔ Excellent performance in compact installations
✔ Stable measurement without flow profile dependency
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What is a Circular Gear Flow Meter
A circular gear flow meter is a positive displacement flow meter designed for accurate measurement of liquid flow.
Unlike oval gear flow meters, circular gear meters feature a compact gear structure that provides:
✔ More stable operation in confined spaces
✔ Simplified mechanical design
✔ Reliable measurement for continuous industrial processes
Each gear rotation represents a fixed volume, ensuring consistent and repeatable results.
How It Works
The meter uses precision gears rotating inside a chamber.As liquid flows through the meter:
• The gears rotate proportionally to flow
• Sensors detect gear movement without direct contact
• Pulse signals are generated and converted into flow data
Outputs include:
• Instant flow rate
• Total accumulated flow
• Pulse / 4–20mA / RS485 signals
This ensures accurate and stable measurement even at low flow rates.
Key Advantages
✔ High accuracy (±0.2%)
✔ Excellent performance at low flow rates
✔ Compact and robust structure
✔ Not affected by turbulence or flow profile
✔ Minimal straight pipe requirement
✔ Suitable for continuous operation
✔ Wide pressure range (up to 40 MPa)
Best Applications
• Lubrication systems
• Hydraulic systems
• Fuel consumption monitoring
• Chemical dosing
• Industrial process control
Viscosity Considerations
Liquid viscosity affects flow meter performance.
HHD provides:
✔ Viscosity-based calibration
✔ Flow correction guidance
✔ Engineering support for temperature variations
This ensures accurate measurement across different operating conditions.
Material & Compatibility
Material Options for Different Applications
Selecting the right material is critical for performance, durability, and chemical compatibility.
HHD circular gear flow meters are available in multiple material options.
The table below shows the recommended material options for different applications and fluids.
- Material Selection Guide for Circular Gear Flow Meter (316L, 304, PEEK, PTFE)
| Material | Best For |
| Aluminum | Fuel and oil |
| 304 | General industrial liquids |
| 316L | Corrosive & food-grade liquids |
| PEEK | High temperature & aggressive chemicals |
| PTFE | Strong acids and alkalis |
• Aluminum Alloy
→ Lightweight and economical
→ Best for fuel, oil, and lubrication systems
• Stainless Steel 304
→ Suitable for general industrial liquids
→ Cost-effective choice for non-corrosive media
• Stainless Steel 316L
→ Ideal for corrosive chemicals, food-grade, and hygienic applications
→ Excellent corrosion resistance and long service life
• PEEK (Polyether Ether Ketone)
→ High temperature resistance
→ Excellent chemical resistance
→ Ideal for aggressive chemicals and precision applications
• PTFE (Teflon)
→ Outstanding corrosion resistance
→ Suitable for strong acids and alkalis
→ Low friction, ideal for sensitive fluids
Optional materials are available for extreme conditions such as high temperature, high pressure, and highly corrosive media.
As shown in the material selection table, stainless steel 316L and PTFE are recommended for corrosive liquids.
Technical Specifications
Flow Range: 0.1 – 50,000 L/h
Pressure: up to 40 MPa
Temperature: -20°C to 130°C (200°C optional)
Connection: G1/8 – G2 1/2
Model Selection
Select the appropriate model based on your flow range and operating conditions.
Circular Gear Flow Meter Model Selection (Flow Range & Specifications)
| Mode | Flow Range | Connection Size |
| HDF6000-LW01 | 0.1–100 L/h | G1/8 |
| HDF6000-LW02 | 3–50 L/h | G3/8 |
| HDF6000-LW04 | 5–250 L/h | G3/8 |
| HDF6000-LW06 | 10–500 L/h | G1/2 |
| HDF6000-LW15 | 30–3000 L/h | G1/2 |
| HDF6000-LW20 | 50–5000 L/h | G3/4 |
| HDF6000-LW25 | 100–10000 L/h | G1 |
| HDF6000-LW40 | 1000–20000 L/h | G1 1/2 |
| HDF6000-LW50 | 2000–30000 L/h | G2 |
| HDF6000-LW65 | 4000–50000 L/h | G2 1/2 |
According to the model selection table, you can choose the correct flow meter based on your flow range and pressure.
Avoid Costly Mistakes
Using the wrong flow meter can cause system issues:
• Using circular gear meter in dirty liquids → gear blockage
• Using turbine for viscous fluids → measurement error
• Using ultrasonic for small flow → unstable readings
⚠ Incorrect selection may lead to inaccurate measurement and downtime.
→ Talk to an Engineer before selection
Compare gear vs turbine vs ultrasonic:
/en/knowledge/compare/electromagnetic-vs-ultrasonic-vs-turbine-flow-meter/
Explore full gear flow meter range:
/en/products/flow-meter/gear-flow-meter/
Installation Guidelines
• Install horizontally (recommended)
• Ensure full pipe condition
• Install filter upstream
• Avoid vibration and interference
• Provide bypass for maintenance
FAQ
Q: What liquids are suitable?
A: Clean liquids such as oil, fuel, and chemicals.
Q: Can it measure viscous fluids?
A: Yes, it performs well with medium to high viscosity liquids.
Q: Is it suitable for dirty liquids?
A: No, particles may damage internal gears.
Q: Does it require straight pipe?
A: No, it is not sensitive to flow profile.
Need help selecting the right circular gear flow meter?
✔ Tell us your application
✔ Get expert recommendation within 10 minutes
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→ Download Datasheet
Not sure which material fits your application?
→ Our engineers will recommend the best material based on your fluid and operating conditions.
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Huaibei Huadian Automation Technology Co., Ltd.
Email:8001@huadianauto.com
Address: University Science Park, Economic Development Zone, Xiangshan District, Huaibei City, Anhui Province
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