The oval gear flow meter is a positive displacement (PD) flow measurement device designed for precise volumetric measurement of liquids, especially high-viscosity and low-flow-rate media.
By mechanically trapping and transferring fixed volumes of fluid, the meter provides stable and repeatable measurement independent of flow profile, pressure, or fluid conductivity.
Instrava oval gear flow meters are engineered for industrial applications requiring high accuracy, strong repeatability, and reliable performance under changing process conditions, including viscous, lubricating, or chemically aggressive fluids.
Flow Meter Description
Oval Gear Flow Meter Key Features
Direct volumetric measurement with high accuracy and repeatability
Excellent performance for high-viscosity liquids
Measurement unaffected by flow profile or Reynolds number
Stable performance at low flow rates
Compact structure with minimal installation space
Multiple signal outputs: pulse, 4–20 mA, digital communication
Wide material options for chemical compatibility
Flow Meter Oval Gear Typical Applications
Lubricating oil and hydraulic oil measurement
Fuel oil, diesel, and light hydrocarbons
Resin, polymer, adhesive, and coating processes
Chemical dosing and batching systems
Food, pharmaceutical, and cosmetic liquids
OEM skid-mounted and metering systems
Oval Gear Flow Meter Working Principle
The oval gear flow meter operates on the positive displacement principle.
As fluid enters the measuring chamber, it drives two synchronized oval gears to rotate. Each rotation traps and transfers a fixed and known volume of liquid from the inlet to the outlet.
The rotation of the gears is detected by a sensor, generating pulse signals proportional to the volumetric flow rate. Because each pulse corresponds to a precise displaced volume, the flow meter delivers highly accurate instantaneous flow and totalized flow measurement.
Oval Gear Flow Meter Structure & Reliability
Dual oval gear design ensures continuous and smooth fluid transfer
Precision-machined measuring chamber for long-term accuracy
Bearings and gears optimized for viscous and lubricating media
Robust housing materials for pressure and corrosion resistance
Low internal leakage for improved measurement accuracy
This mechanical simplicity results in excellent long-term stability and low maintenance requirements.
Flow Meter Parameter
| Item | Specification |
|---|---|
| Product Model | OGF 128 Oval Gear Flow Meter |
| Material | Cast iron, Cast steel, 304 stainless steel, 316 stainless steel |
| Nominal Diameter | DN10 – DN200 |
| Measuring Medium | High-viscosity liquids such as heavy oil, polyvinyl alcohol, resin |
| Flow Range | 40 – 120,000 L/h |
| Medium Temperature | -20 ~ 100 °C |
| Measurement Accuracy | ±0.5% of reading |
| Working Pressure | ≤ 1.6 MPa |
| Output Signal | Pulse output |
| Power Supply | 12 VDC or 24 VDC |
Instrava OEM/ODM
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We can facilitate the customization of specialized products based on your project requirements (such as power-related equipment, where we can engage Chinese design institutes for product development—subject to a separate fee).
We can tailor comprehensive project upgrade solutions to your facility’s needs (such as migrating traditional instrumentation to the cloud or upgrading to technologies like Ethernet-APL).
We can source precision measurement instruments to meet your laboratory’s requirements.
And much more…
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Related Product Recommendations
Why are oval gear flow meters suitable for high-viscosity liquids?
Oval gear flow meters operate on the positive displacement principle, mechanically transferring fixed fluid volumes. This makes them highly insensitive to viscosity changes, allowing stable and accurate measurement of heavy oils, resins, polymers, and other high-viscosity media.
How does an oval gear flow meter perform at low flow rates?
Unlike velocity-based meters, oval gear flow meters maintain excellent accuracy at low flow rates because each gear rotation represents a fixed volume. This makes them ideal for low-flow dosing, batching, and precision transfer applications.
How is pulse output used in oval gear flow measurement systems?
Pulse output provides a direct digital representation of volumetric flow, where each pulse corresponds to a defined volume. This enables precise totalizing, batching, and easy integration with PLC, DCS, and industrial automation systems.
Does pressure fluctuation affect measurement accuracy?
No. Because oval gear flow meters measure actual displaced volume, their accuracy is largely unaffected by pressure changes or flow profile disturbances, provided the system operates within the rated pressure range.
Can oval gear flow meters be used for intermittent or start-stop flow?
Yes. Oval gear flow meters are well suited for intermittent, pulsating, or start-stop flow conditions, as the mechanical displacement principle ensures accurate totalization even during unstable flow patterns.
What maintenance considerations apply to pulse-output oval gear flow meters?
Maintenance is minimal when measuring clean, lubricating liquids. Periodic inspection focuses on gear wear and signal stability, especially in high-viscosity applications, ensuring long-term measurement reliability.
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