Oval gear flowmeter is a typical volumetric flow meter. It is also an on-site measurement instrument with high measurement accuracy, stability and adaptability. It is the first choice instrument when measuring high-temperature and high-viscosity media with high on-site accuracy requirements.

After years of development, this watch can be divided into two types: electronic and mechanical. The mechanical oval gear flowmeter does not have any power-consuming equipment, and its resistance to high and low temperatures is much higher than that of smart meters. However, in some conventional sites, smart instruments have clear readings and various remote transmission methods, which meet the current mainstream automation control requirements and are widely used.

The main structure of the oval gear flowmeter consists of a housing, a counter, an oval gear and a coupling. A pair of meshing gears installed in the metering box and the upper and lower cover plates form a sealed crescent-shaped cavity. During metering, the gear rotates one revolution due to the medium dragging it, which is used as a calculation unit for one discharge. When the liquid to be measured enters the flow meter through the pipeline, a pair of gears are driven to rotate continuously due to the pressure difference generated at the inlet and outlet, and the liquid measured by the crescent-shaped cavity is continuously delivered to the outlet. The product of four times the secondary displacement is the total amount of liquid flow measured.

The oval gear flowmeter is a positive displacement flowmeter. The flow measurement has nothing to do with the flow state of the liquid, and basically no straight pipe is needed. 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 higher the viscosity of the medium, the smaller the leakage of the medium from the gear and metering clearance, and the smaller the design error. The oval gear flowmeter has high measurement accuracy and is suitable for measuring the flow rate of high-viscosity media. The adhesion between the two gears is high, but it is not suitable for fluids containing solid particles. When measuring liquids, if solids are included, the gears may become stuck. The medium contains gas, which causes measurement errors.