The oval gear flowmeter is a high-precision flow meter based on the volumetric measurement principle. It is mainly used for liquid flow measurement, especially for high-viscosity media.

Ⅰ. Working Principle

The pressure difference between the inlet and outlet fluid drives a pair of meshing oval gears to rotate. The gears and the housing form a periodically changing sealed cavity (crescent-shaped cavity), and four times the cavity volume of fluid is discharged every rotation. The gear rotation number is transmitted to the counting mechanism through magnetic coupling and converted into flow data output.

Ⅱ. Core technical parameters

- Measurement accuracy: 0.2%-0.5% (high-precision type can reach 0.2%)

- Viscosity adaptability range:

- Ordinary type: 0.6-200mPa·s (suitable for light oil and aqueous solution)

- High viscosity type: 200-2000mPa·s (compatible with heavy oil, resin, etc.)

- Temperature/pressure range:

- Temperature: -20℃ to +200℃ (high temperature type requires a radiator)

- Pressure: ≤6.4MPa (nominal pressure 1.6-6.4MPa)

- Caliber and flow: DN10-DN200, flow coverage 0.04-340m³/h

Ⅲ. Application scenarios

1. High viscosity media: heavy oil, polyvinyl alcohol, resin, hydraulic oil (strong viscosity adaptability and high measurement stability)

2. Industrial field:

- Petrochemical (crude oil, diesel metering)

- Food and medicine (organic solution, paste)

- Energy (hydraulic system, injection molding machine flow monitoring)

3. Special needs: high temperature medium (with radiator), corrosive liquid (material can be 316 stainless steel)

IV. Core advantages

- Stable accuracy: The measurement result is independent of the fluid flow state, and the leakage error of high viscosity medium is smaller;

- Diverse output: The mechanical counter displays the total amount on the spot, and the electronic type supports instantaneous flow, 4-20mA signal, RS485 communication;

- Reliable structure: Cast iron/stainless steel material is corrosion-resistant, and the sealing design is leak-proof.

V. Limitations

- Medium restrictions: Liquids containing solid particles will cause gear jamming and require pre-filtration;

- Cost maintenance: The initial investment is high, and regular lubrication and sealing inspection are required.

Tips: With its stable high accuracy and wide viscosity adaptability, this flow meter is irreplaceable in key flow measurement in the fields of energy, chemical industry, etc., especially suitable for working conditions that require long-term stable operation.