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Oval gear flow meter installation precautions


The oval gear flow meter is a reliable and accurate flow measurement tool that calculates the flow rate of a fluid by measuring the speed of an oval gear. Its advantages include high accuracy, a wide measuring range, high-pressure resistance, and good resistance to wear and tear. Oval gear flow meters are used in a wide range of applications in the oil and gas, chemical industry, water treatment, pharmaceutical, and food and beverage sectors. They are important for achieving accurate flow measurement and fluid control. It helps engineers and professionals to monitor and optimize the flow of fluids, ensuring the stability and efficiency of production processes.

What is an oval gear flow meter?

The oval gear flow meter is a mechanical flow meter that uses a rotating oval gear to meter fluids. It calculates the flow rate of a fluid by measuring the speed of the oval gear and the volume of fluid passing through the gear.

The working principle of the oval gear flow meter 

The operating principle of an oval gear flow meter is based on the measurement of the volume of fluid passing through a rotating oval gear. As the fluid passes through the inlet of the flowmeter, it causes the gear to rotate. The two main axes of the oval gear have different lengths, meaning the fluid is pushed or pulled between the inlet and outlet in each rotation. This pushing or pulling process causes the speed of the gear to be proportional to the flow rate of the fluid.

Oval gear flow meters measure the speed of the gear by connecting a rotating oval gear to a sensor. The sensor outputs an electrical signal proportional to the gear's speed. By measuring the rotational speed of the gear and the known gear parameters, the flow rate of the fluid can be accurately calculated.

Advantages of the oval gear flow meter

High accuracy:

Oval gear flow meters provide highly accurate flow measurements for applications requiring flow measurement.

Wide measuring range:

Oval gear flow meters are suitable for a wide range of flow rates, from low to high, which can be accurately measured with a large measuring range.

High-pressure resistance:

The oval gear flowmeter can withstand high-pressure and high-temperature environments and has good pressure resistance, suitable for harsh working conditions.

Good resistance to wear and tear:

Oval gear flowmeter is usually manufactured with high-strength materials with good wear resistance, can be a long time stable operation, and reduce the frequency of maintenance and replacement.

Applications of oval gear flow meters

Oil and gas industry:

Oval gear flow meters are widely used in the oil and gas sector to measure the flow of media such as crude oil, natural gas, and liquefied petroleum gas to help monitor production and transmission processes.

Chemical industry:

In the chemical industry, oval gear flow meters are used to measure the flow of liquids or gases, ensuring the accurate control and monitoring of chemical reaction processes.

Water treatment and water supply systems:

Oval gear flow meters are widely used in water treatment and water supply systems to measure the flow rate in water supply volumes, effluent discharge, and water treatment processes.

Pharmaceutical industry:

Oval gear flow meters are used in pharmaceutical processes for the accurate metering and control of pharmaceuticals and solutions, ensuring the accuracy and consistency of the production process.

Food and beverage industry:

In food and beverage production, oval gear flow meters are used to measure the flow of liquids and slurries to ensure product quality and production efficiency.

Oval gear flow meters are an important tool for flow measurement with their accurate measurement, reliability, and wide range of applications. It provides reliable support for accurately measuring and controlling fluid flow in various fields such as industrial production, the energy sector, and environmental protection, helping the development and progress of all industries.

Oval gear flow meter installation precautions

Clean the pipeline:

The new pipeline should be cleaned before operation, and then flushed with real flow to remove residual welding debris and scale. At this time, the front and rear shut-off valves of the instrument should be closed first, so that the liquid flows through the bypass pipe; if there is no bypass pipe, a short pipe should be installed at the position of the instrument instead.

Exhaust the gas:

Usually, after the real liquid sweeps the line, there is still a lot of air in the pipeline. With the pressurized operation, the air flows through the volumetric flowmeter at a higher flow rate, and the movable measuring element may run too fast, damaging the shaft and bearings. Therefore, the flow should be increased slowly at the beginning to allow the air to gradually escape.

Bypass pipe switching sequence: 

When the liquid flow is transferred from the bypass pipe to the instrument, the opening and closing should be slow, especially on high-temperature and high-pressure pipelines. After starting, use the lowest pointer or dial and stopwatch to confirm that the excessive flow is not reached. The optimal flow should be controlled at (70-80)% of the maximum flow to ensure the service life of the instrument.

Monitoring filter:

The filter net of the new line is most likely to be broken. After the trial run, it is necessary to check whether the net is intact. At the same time, when the filter screen is clean and free of dirt, record the pressure loss under the usual flow rate.

For measuring high-viscosity liquids:

For high-viscosity liquids, they are generally heated to make them flow. When the meter is out of service, the liquid inside it cools down and becomes thicker. When it is restarted, it must be heated until the viscosity of the liquid is lowered before the liquid flows through the meter. Otherwise, the movable measuring element will be bitten and the meter will be damaged.

Add lubricating oil:

Lubricating oil must be added before the PDF is used for gas, and the liquid level gauge for checking the lubricating oil stock is often checked in daily operation.

Avoid sharp flow changes: 

When using a gas waist wheel flowmeter, care should be taken not to have sharp flow changes (such as using a quick-opening valve). Due to the inertia of the waist wheel, a sharp flow change will generate a large additional inertial force, making the rotor damage. When used as a detection instrument for the control system, if the downstream control suddenly cuts off the flow, the rotor cannot stop for a while, resulting in a compressor effect, the downstream pressure rises, and then flows backwards, sending out an error signal.

The steam used for flushing the pipeline is prohibited from passing through the oval gear flowmeter.

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