NKGF-LC Oval Gear Flow Meter | High-Accuracy Positive Displacement Flow Meter
Model: NKGF
Specification
Product Overview
The NKGF-LC Oval Gear Flow Meter is a positive displacement flow meter designed for accurate measurement of liquid flow in industrial pipelines. It consists primarily of a metering chamber, precision oval gears, and transmission components. As liquid flows through the meter under pressure, the oval gears rotate, and each rotation displaces a fixed volume of liquid, enabling precise volumetric flow measurement.
The oval gear flow meter NKGF-LC offers high accuracy, reliable operation, simple construction, and excellent repeatability. It requires no special straight-pipe conditions at the inlet or outlet and performs well across a wide range of liquid viscosities and flow rates.
It is suitable for continuous or intermittent flow measurement and process control, especially for oils, fuels, lubricants, chemicals, and other high-viscosity liquids.
Working Principle
The Oval Gear Flow Meter NKGF-LC operates using the positive displacement measuring principle. The pressure of the flowing liquid drives two precision oval gears to rotate inside the measuring chamber.
Each complete rotation transfers a fixed volume of liquid. By counting the number of gear rotations, the meter accurately calculates both instantaneous flow and total accumulated flow.
For higher-viscosity liquids, internal leakage between the gears and the measuring chamber is reduced, which helps improve measurement accuracy. However, the meter is not suitable for liquids containing solid particles or significant gas bubbles, as these may affect measurement performance.
Product Features
- Positive displacement measuring technology
- High measurement accuracy (Class 0.5 or Class 0.2)
- Suitable for high-viscosity liquids
- Wide viscosity and flow measurement range
- No special inlet or outlet flow profile requirements
- Reliable mechanical structure with long service life
- Continuous and intermittent flow measurement
- Local indication of cumulative and instantaneous flow
- Supports pulse output
- Optional analog outputs (4–20mA, 1–5V)
- Optional 4–20mA + HART communication
- MODBUS communication supported
- RS232 and RS485 communication supported
- Compatible with mechanical and electronic batch controllers
Technical Specifications
NKGF-LC Oval Gear Flow Meter Measurement Performance
| Parameter | Specification |
|---|---|
| Measuring Principle | Positive Displacement |
| Accuracy Class | 0.5 / 0.2 |
| Operating Temperature | -20°C to +60°C (standard) |
| High-Temperature Version | Up to 200°C (with heat dissipation cylinder) |
| Flow Display | Instantaneous flow, accumulated flow, batch flow |
Output Options
- Pulse Output
- 4–20mA
- 1–5V
- 4–20mA + HART
- MODBUS
- RS232
- RS485
Explosion-Proof Version
- Ex ia II CT5
- d II BT5
Available Materials
| Model | Body Material | Gear Material | Bearing | Nominal Pressure |
|---|---|---|---|---|
| A | Cast Iron | Cast Iron | Oil-impregnated Bronze / Rolling Bearing | 1.6 MPa |
| E | Cast Steel | Stainless Steel | — | DN＜50: 6.3 MPa; DN80–100: 4.0 / 6.3 MPa; DN150–200: 2.5 MPa |
| Q | Cast Iron / Cast Steel | Aluminum Alloy | Graphite | 1.6 MPa |
| B / C | Stainless Steel | Stainless Steel | Graphite / Rolling Bearing | DN＜50: 2.5 MPa; DN≥80: 1.6 MPa |
Applications
The Oval Gear Flow Meter NKGF-LC is widely used in liquid flow measurement and control across many industries.
Petroleum & Oil
- Fuel oil
- Diesel
- Lubricating oil
- Hydraulic oil
Chemical Industry
- Chemical solvents
- Industrial chemicals
- Corrosive liquids (with suitable material selection)
Pharmaceutical Industry
- Medical liquids
- Alcohol
- Pharmaceutical solutions
Food & Beverage
- Edible oil
- Syrup
- Honey
- Molasses
- Chocolate
- Beverage ingredients
Transportation & Commercial Fueling
- Fuel transfer
- Oil distribution
- Fuel management
Scientific Research & Laboratory
- Precision liquid measurement
- Experimental fluid monitoring
Military & Industrial Equipment
- Fuel systems
- Hydraulic systems
- Lubrication systems
Why Choose the Oval Gear Flow Meter NKGF-LC ?
High Accuracy for Viscous Liquids
The positive displacement measuring principle minimizes leakage errors, making the meter especially suitable for high-viscosity media.
Stable Mechanical Design
The precision oval gear mechanism delivers reliable volumetric measurement with excellent repeatability and long-term stability.
Flexible Signal Outputs
Multiple output options—including pulse, analog, HART, MODBUS, RS232, and RS485—allow easy integration into industrial automation systems.
Wide Material Selection
Multiple body and gear material options enable compatibility with different operating pressures and process media.
Suitable for Batch Control
When combined with mechanical or electronic batch controllers, the meter supports filling, dosing, and batching applications.
Typical Application Case
Fuel Oil Measurement in an Industrial Transfer System
In an industrial fuel transfer process, accurate flow measurement is essential for inventory management and process control. The Oval Gear Flow Meter NKGF-LC measures the transferred fuel using its precision oval gear mechanism, where each gear rotation represents a fixed liquid volume.
The meter provides both instantaneous and accumulated flow data while supporting pulse and analog outputs for integration with PLCs and batch controllers. Its positive displacement design delivers reliable measurement for high-viscosity fuel oils without requiring special inlet or outlet pipe conditions.
Frequently Asked Questions (FAQ)
What measuring principle does the Oval Gear Flow Meter NKGF-LC use?
It operates using the positive displacement principle with precision oval gears.
What liquids are suitable for measurement?
It is suitable for oils, fuels, lubricants, syrups, chemicals, pharmaceutical liquids, edible oils, and many other compatible liquids.
Can it measure high-viscosity liquids?
Yes. Higher-viscosity liquids generally produce smaller leakage errors, making the meter particularly suitable for these applications.
Can the meter measure liquids containing solid particles?
No. Solid particles may jam the oval gears and affect measurement performance.
What output signals are available?
Available outputs include:
- Pulse
- 4–20mA
- 1–5V
- 4–20mA + HART
- MODBUS
- RS232
- RS485
Does the flow meter support batch control?
Yes. It can be used together with mechanical or electronic batch controllers for filling and batching applications.
Is a high-temperature version available?
Yes. With a high-temperature heat dissipation cylinder, operating temperatures can reach 200°C.
Optional Services
- Material selection according to process media
- High-temperature configuration
- Explosion-proof configuration
- Customized communication interfaces
- Technical application support
- OEM & ODM manufacturing
- Installation and commissioning assistance
Industries Served
- Petroleum
- Chemical Processing
- Pharmaceutical Manufacturing
- Food & Beverage
- Transportation
- Scientific Research
- Commercial Fuel Management
- Military Equipment
- Industrial Automation
Table of Contents
Talk With Us
- [email protected]
- +86 180 5512 0225
- +86(0551)-65501008
- Address: 206, Block B, No. 2 Tianda Road, High-tech Zone, Hefei City, Anhui Province, China
- We will respond to you within five minutes.
