What is Gear Flow Meter
Gear Flow Meters can be used in a wide range of media applications and are designed for clean process fluids. No flow conditioning allows for superior design flexibility. Maintenance is minimal and changing viscosities do not affect meter accuracy. Cost of ownership can be very attractive compared to other flow technologies while providing highly accurate and repeatable results. Gear Meters are mechanical meters and should not be used in fluids with non-soluble particulate. This is a liquids only meter - gases are not suitable.
Advantages of Gear Flow Meter
1. It has high measurement accuracy, the basic error is generally ± 0.5% R, special up to ± 0.2% R or higher. It is usually used in expensive media or where precise metering is required.
2. The flow measurement is independent of the flow state of the fluid. That is, the oval meter has no influence on the measurement accuracy when the rotational flow and the flow path of the pipe choke are distorted, and there is no requirement for the upstream straight pipe section. This is because the oval gear flow meter is measured by the rotation of the oval gear by the pressure of the measured medium. This is of great significance in field use.
3. Oval gear flow meters can be used for the measurement of high viscosity fluids. The larger the viscosity of the medium, the smaller the leakage amount leaked out from the gear and the metering gap.
4. It has large turn down ratio, usually 10:1 to 5:1, special up to 30:1 or larger.
5. It is a direct-reading flow instrument. It can obtain the total flow directly without external power source. It is clear and easy to operate.
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Our products include a wide range of flow meter like Ultrasonic Flow Meter，Electromagnetic Flow Meter, Vortex Flow Meter, Thermal Mass Flow Meter, Turbine Flow Meter, Liquid Level Flow Meter, Gear Flow Meter, Totalizer Flow Meter and so on.
Working Principle of Gear Flow Meter
The Oval Gear Flowmeter works by measuring the amount of liquid or gas that flows through a pipe. The device consists of two gears, an inner and an outer gear. The inner gear has a smaller circumference than the outer gear. As the liquid or gas flow through the device, the gears rotate. The amount of rotation is proportional to the amount of liquid or gas that is flowing through the pipe.
One advantage of using an Oval Gear Flowmeter is that it is very accurate. The device can measure flows as low as 0.015 mL/min and as high as 100 L/min with accuracy within +/- 0.05%. This makes it ideal for businesses that need to accurately measure small amounts of liquids or gases. Additionally, Oval Gear Flowmeters are very durable and can withstand high pressures and temperatures.
Oval gear flowmeters provide extremely accurate liquid measurement in difficult applications including those with low flows or where space is limited because they have no moving parts in the flow path. Oval gear meters are positive displacement meters that measure the flow rate by counting the number of times the inner gear revolves around the central axis. This technology is not new, but it has seen a resurgence in popularity because it can be used with a wide variety of fluids, is compatible with low-flow applications, and is very accurate. Oval gear meters are also highly durable, making them ideal for use in high-pressure or high-temperature environments.
Key Factors to Consider When Choosing a Gear Flow Meter
1. Fluid
Identifying the type and state of the fluid being measured is crucial for selecting the appropriate gear flow meter. Gases and liquids have different measurement requirements, with gases being compressible and requiring specialized meters. This article focuses on selecting a meter for liquid measurement. Once the fluid is identified, its cleanliness and compatibility with meter materials should be assessed to ensure accurate and reliable measurement.
Once the type of fluid has been identified, it's crucial to determine its cleanliness. A contaminated fluid, often referred to as a slurry, contains solid particles, whereas a clean fluid is particle-free.
2. Viscosity and flow profile
Viscosity, or fluid thickness, plays a significant role in flow measurement. Different flow profiles, such as laminar and turbulent flow, require different metering techniques. Understanding the viscosity of the fluid allows for the selection of the most suitable gear flow meter technology, whether it's positive displacement meters for high-viscosity fluids or velocity meters for low-viscosity fluids.
It's important to note that viscosity is affected by temperature. In liquids, viscosity decreases as temperature increases, following an inverse relationship. Therefore, considering the operating temperature of the system or application is crucial to understanding how fluid flow will be influenced by viscosity changes.
3. Flow rate information
Determining the flow rate range is essential for selecting the right-sized meter. Flow rate directly impacts meter performance and durability. Selecting a meter with a flow rate range that encompasses the application's requirements ensures optimal performance and longevity.
When sizing gear flow meters, we adhere to a practical guideline: Aim for flow rates between 20% and 80% of the maximum capacity to determine the appropriate meter size. This range should encompass the minimum and maximum flow rates expected in the application.
4. Temperature and pressure rating
Temperature and pressure ratings are critical parameters for meter selection. Meter materials must withstand the fluid's temperature and pressure to prevent inaccuracies and hazards. Operating within the meter's allowable temperature and pressure limits ensures reliable measurement and prevents meter failure.
Ensuring that the system's temperature and pressure do not surpass the gear flow meter's allowable limits is crucial to avoid measurement inaccuracies and potential hazards. Elevated temperatures can impact the pressure capacity of the meter, causing metals to become more ductile and prone to stretching. Maximum pressure ratings are designed to accommodate the highest temperature rating of a meter, thus maintaining its integrity and accuracy under varying operating conditions.
5. Accuracy / repeatability / linearity
Accuracy, repeatability, and linearity are essential performance factors for gear flow meters. High accuracy meters are necessary for applications requiring precise measurement, such as dosing or custody transfer. Understanding these performance parameters ensures the selected meter meets the application's requirements.
6. Installation
Proper meter installation is vital for optimal performance. Considerations such as piping configuration, flow direction, and straight run pipe requirements impact meter accuracy and reliability. Following manufacturer guidelines for installation ensures accurate measurement and prevents operational issues.
The Proper Installation of Oval Gear Meter Flow Measurement
Oval gear meter flow measurement is a kind of positive—displacement flow meter, which belongs to the kind of flow meter having high accuracy. In order to ensure the accuracy of the flow meter, the correct installation method is very important.
Before installing oval gear flow meter measurement, the filter should be installed first. The directions pointed by both shells should be the same as the flow direction.
When the measured liquid contains gas, the place in the front of oval gear flow meter measurement should be mounted gas separator.
No matter the pipes are installed vertically or horizontally, the axel in the oval gear of oval gear flow meter measurement should be installed in a horizontal position.(The dial should be perpendicular to the ground).
In the situation where oval gear flow meter measurement is installed correctly, if the reading is not clear, it will be alright only if the counter is turned to 180 degree or 90degree.
Before the installation of oval gear flow meter measurement, we should use a bamboo stick to push the gear from the exit for several times. If you find it immovable, you can use gasoline to soak it(avoid there will be precipitate after leaving the factory and having the verification).
The throttle should be installed to the entrance of oval gear flow meter measurement, and switch valve should be installed to the exit. When you are opening and closing every valve, you should be slowly. Do not rush to open or close the valves.
It is strictly forbidden to use flow rate of vapor to pass through oval gear flow meter measurement.
When the sectors are continuously used, the by-pass line should be added to the oval gear flow meter measurement.
Before the oval gear flow meter is installed, the pipes ought to be cleaned. When it is washed, you should use straight length( to replace the position of oval gear flow meter measurement) in case of wielding slag and sundries going into oval gear flow meter measurement.
It is strictly forbidden to use water to verify the oval gear flow meter measurement which is made of cast iron material.
When the oval gear flow meter measurement is being used, the size of flow can not surpass the technical requirement. When oval gear flow meter van be working best when the flow ranging from 50 to 80%.
The measured liquid has to be measured by oval gear flow meter measurement with stainless steel material which is corrosion preventive especially when the liquid has chemical etching.
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.
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.
How to Use Oval Gear Flowmeter
Check the filter
The new pipe line startup filter network is most easily broken. After the test run, it is necessary to check whether the pipe line network is in good condition. At the same time, when the filter is clean and free of dirt, users should record normal flow and pressure loss for the future reference.
Measuring high viscosity liquid
Oval gear flow meters are suitable to measure high viscosity liquids, users need to generally heat the fluids to flow when start to use the flow meter again. When the flow meter is stop working, its internal fluids is cooled and thickened. When it is working again, cooled fluids must be heated before it flows through the flow sensor. The flow sensor measuring component will be damaged by the thick cold flow.
Avoid sharp flow changes
A sharp flow change produces a large additional force that damages the gear rotor which could easily damage the flow meter.
Bypass pipe switching
When the liquid flow is transferred from the bypass pipe to the meter, users need to open and close the bypass slowly, especially on the high temperature and high pressure pipeline. When it is activated, open the inflow side valve, then slowly open the valve on the outlet side, observe the running condition of the flow meter, and finally close the bypass valve. The optimum flow rate should be controlled at (70~80) % of the maximum flow to ensure the service life of the instrument.
The operation flow
The min flow should not be too small, the operation flow should be operation within the value which indicated on the flow meter name plate, and otherwise the oval flow meter could have poor accuracy.
The medium temperature
The medium temperature should not be too high. It should be within the temperature indicating one the name plate, otherwise it could have the possibility of jamming the gear
Regularly check the gear condition.
After long-term use of the oval gear flowmeter, the internal gears will be corroded and worn, which will affect the measurement accuracy. Therefore, always pay attention to observation, and regularly remove it for inspection and re-calibration.
5 Industrial Applications for Oval Gear Flow Meters
Oval gear flow meters are commonly used for measuring the flow rate and volume or flow total of chemicals that are utilized in batching applications. Preset volumes of chemicals can be automatically distributed by using a batch controller in conjunction with an oval gear flowmeter. Data collected from measurements can be sent to a computer or PLC for logging.
Another common industrial use for oval gear flow meters is measuring net fuel usage in engines and boilers. By positioning one oval gear flow meter in the supply line and another in the return line, the total net fuel usage in an engine or boiler can accurately be determined.
When applying lubrication to bearings, oval gear flow meters enable sufficient distribution of lubricant. Additionally, through the use of a controller, oval gear flow meters provide a way to automatically shut down the machinery in case of insufficient flow or no flow at all.
Oval gear flow meters are frequently used with paper finishing chemicals to ensure an ideal rate of delivery and to record precise measurements of the volumes of chemicals being dispensed. The distribution of wax finishes, perfumes, and sizing chemicals, sprayed onto the paper, can be measured with an oval gear flow meter.
Oval gear flow meters also offer many advantages to companies in the food and beverage industry. In the food and beverage industry, oval gear flow meters can be used to keep track of syrup injections in main beverage lines, monitor and batch volumes of candy coatings, and for precise, automatic distribution of cooking oils.
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