The working principle of the oval gear flowmeter The measurement part of the oval gear flowmeter is mainly composed of two elliptical gears meshing with each other and their casing (measuring chamber), as shown in the following figure:

 Working principle diagram of oval gear flowmeter

The flow measurement has nothing to do with the flow state of the fluid. This is because the oval gear flowmeter relies on the pressure head of the measured medium to push the oval gear to rotate for measurement. The greater the viscosity of the medium, the smaller the leakage from the gear and the metering gap. Therefore, the larger the sticky skin of the nuclear test medium, the smaller the leakage error, and the more beneficial to the measurement. The elliptical gear flowmeter has high measurement accuracy and is suitable for the measurement of the flow of high-viscosity media, but not for fluids containing solid particles (solid particles will jam the gear and make it impossible to measure the flow). If the measured liquid medium contains gas, it will also cause measurement errors. The oval gear flowmeter is a type of positive displacement flowmeter, used for precise continuous or discontinuous measurement of the flow or instantaneous flow of liquid in the pipeline. It is especially suitable for the flow measurement of heavy oil, polyvinyl alcohol, resin and other high viscosity media.

Features:

1. High measurement accuracy, wide flow range and good repeatability;

2. The spiral rotor rotates evenly, with little vibration and long life;

3. It is not sensitive to the change of the viscosity of the liquid to be tested, and is especially suitable for the measurement of liquids with higher viscosity;

4. Simple structure, small size and light weight;

5. Easy to install, no need to install straight pipes in front of the meter;

typical application:

Oval gear flowmeters are mainly used to measure high-viscosity media. The products are widely used in petroleum, petrochemical, natural gas, chemical, papermaking and other industries to measure small flowmeters of small pipe diameters.

main advantage:

1. The caliber is from 10 to 200mm;

2. There are a variety of shell materials to choose from: cast iron, cast steel, stainless steel, etc.;

3. There are a variety of bearing materials to choose from: cast iron, cast steel, stainless steel, etc.;

4. Shaft material: cast steel, stainless steel;

5. The material of O-ring is VITON, Viton, stainless steel and Teflon for selection;

6. Turndown ratio 10:1;

7. The accuracy is ±0.5%, 0.2%, and the repeatability is ±0.03%;

8. The viscosity can reach up to 3000CP;

9. The pressure rating can reach up to 6.4MPa;

10. The highest temperature resistance grade can reach -10~200℃.