LCoval-shapedCircular gear flowmeter

Typical applications:
The elliptical gear flowmeter is mainly used to measure high viscosity media, and the product is widely used in industries such as petroleum, petrochemical, natural gas, chemical, paper, etc., for measuring small flow rates of small pipe diameters.

Main advantages:
◆Caliber from10~150mm；
◆There are multiple options for shell materials to choose from: aluminum, stainless steel, and medium to high pressure stainless steelPPSBronze, etc;
◆There are various bearing materials to choose from: ceramic, bronze, Hastelloy, carbidePPSStainless steel, etc;
◆Material of the shaft:316stainless steel;
◆ OThe materials of the ring areVITONFluororubber, stainless steel, and Teflon are available for selection;
◆Range ratio10：1,Zui Dadao50：1；
◆The accuracy is±1%and±0.5%Two types, repeatability±0.03%；
◆Requirements for straight pipe section during installation:5D＋3DA filter needs to be installed;
◆The highest viscosity can reach1,000 000CP；
◆The highest pressure level can reach551bar；
◆The highest temperature resistance level can reach-10~60℃；

2、 Technical performance characteristics

1.Technical performance of elliptical gear flowmeter

2.Characteristics of elliptical gear flowmeter

Flow measurement is independent of the flow state of the fluid, as the elliptical gear flowmeter relies on the pressure head of the measured medium to drive the elliptical gear to rotate for measurement. The higher the viscosity of the medium, the smaller the amount of leakage from the gear and measuring space gap. Therefore, the larger the viscosity of the measured medium, the smaller the leakage error, and the more advantageous it is for measurement. The elliptical gear flowmeter has high measurement accuracy and is suitable for measuring the flow rate of high viscosity media, but it is not suitable for fluids containing solid particles (solid particles can jam the gear, making it impossible to measure the flow rate). If gas is mixed in the measured liquid medium, it can also cause measurement errors. Elliptical gear flowmeter is a type of volumetric flowmeter used for continuous or intermittent measurement of liquid flow or instantaneous flow in pipelines. It is particularly suitable for flow measurement of high viscosity media such as heavy oil, polyvinyl alcohol, resin, etc.

3、 Working principle

The working principle of the elliptical gear flowmeter is that the measuring part of the elliptical gear flowmeter is mainly composed of two meshing elliptical gears and their housing (measuring chamber), as shown in the following figure:

Working principle diagram of elliptical gear flowmeter

4Installation and use precautions of elliptical gear flowmeter

The elliptical gear flowmeter should be cleaned before installation. If the liquid contains solid particles, a filter must be installed upstream of the pipeline; If it contains gas, an exhaust device should be installed. The elliptical gear flowmeter does not have certain requirements for the front and rear straight pipe sections. It can be installed horizontally or vertically. During installation, the elliptical gear rotation axis of the flowmeter should be parallel to the ground.Please refer to the corresponding chapter for installation dimensions.

The elliptical gear flowmeter installed correctly according to the requirements can ensure sufficient accuracy during use, and the accuracy of the cumulative value can usually reach level 0.5, making it a relatively accurate flow measuring instrument. However, if the flow rate of the measured medium is too low during use, the impact of instrument leakage errors will become prominent, and sufficient measurement accuracy cannot be guaranteed. Therefore, different models and specifications of elliptical gear flow meters have an allowable value for the minimum flow rate, and the measurement accuracy can only be guaranteed when the actual measured flow rate is greater than the lower limit flow rate allowable value. Secondly, when using an elliptical gear flowmeter, it is important to note that the temperature of the measured medium should not be too high, otherwise it will not only increase measurement errors but also have the potential to cause gear jamming. Therefore, the elliptical gear flowmeter is used within the specified temperature range of the instrument. After long-term use, the internal gears of the elliptical gear flowmeter will be corroded and worn, which will affect the measurement accuracy. Therefore, it is important to regularly observe and dismantle for inspection. If conditions permit, calibration should be carried out regularly.