Oval Gear Flow Meters with Better Price |Advantages and Disadvantages

Oval Gear Flow Meters, also known as positive displacement flow meter, is a commonly used positive displacement flow meter. It is a class with higher precision in flow meters.

Oval Gear Flow Meters are used for precise continuous or intermittent measurement of the flow or instantaneous flow of liquid in the pipeline. It is especially suitable for flow measurement of heavy oil, polyvinyl alcohol, resin and other media with high viscosity.

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oval gear flow meter price

Part of the reason for choosing an oval gear flow meters is that the price of oval gear flow meter is relatively moderate.

What are the factors that affect the price of oval gear flow meters?
Mainly include:

Diameter
Material
Temperature
Pressure
Flow range
Return to zero function
Mechanical display
Electronic display
Signal output
High viscosity media

Here we provide you with the reference price of the oval gear flow meters with the following configuration:

Flange connection;
Cast iron material;
Accuracy level 0.5;
The mechanical meter shows the accumulation (the meter can display the current flow when it is brought back to zero);
Applicable temperature range: -20℃~+80℃;
Protection class IP65

Reference: Oval Gear Flow Meter Price (USD/SET)

Diameter	DN10	DN15	DN20	DN25	DN40	DN50	DN65	DN80	DN100	DN150	DN200
Cast iron material	295	300	315	335	345	435	545	608	915	2465	3200

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Learn More About Oval Gear Flow Meters

Oval gear flowmeter (also known as displacement flowmeter, gear flowmeter) is a kind of positive displacement flowmeter, and it is a kind of high precision in flowmeter.

As shown, it uses a mechanical measuring element to continuously divide the fluid into a known volume portion. And measures the total flow rate based on the number of consecutive fillings and discharges of the volume portion of fluid in the metering chamber.

As shown in the picture, the oval gear flowmeter in the picture can be made of different materials (cast iron, cast steel, 304 stainless steel, 316 stainless steel). And it is suitable for flow measurement in chemical industry, petroleum, pharmaceutical, electric power, metallurgy and food industry.

Oval Gear Flow Meters consist of a metering box and a pair of oval gears installed in the metering box. The upper and lower cover plates form a sealed crescent-shaped cavity. Due to the rotation of the gears, it is not absolutely sealed.

When the measured liquid enters the flow meter through the pipeline, the pressure difference generated at the inlet and outlet drives a pair of gears to rotate continuously. The liquid measured by the lunar cavity is continuously delivered to the outlet. As shown in the figure, the quadruple product of the quadratic displacement is the total amount of liquid flow measured.

The flowmeter is mainly composed of a casing, a counter, an oval gear and a coupling (electromagnetic coupling and axial coupling).

The advantages and disadvantages of oval gear flow meters are as follows:

Advantages:

(1) The metering cavity maintains a certain volume and is rarely affected by turbulent flow and pulsating flow, so the metering accuracy is high. The general measurement accuracy can reach 0.5 level. Special measurement accuracy can reach 0.2 level. It is usually used in expensive media or where precise metering is required.

(2) It is less affected by the physical properties such as the viscosity of the measuring medium and the flow state. Especially suitable for liquid, high viscosity liquid metering. The more viscous the medium, the smaller the leakage from the gap between the gear and the metering space. Therefore, the greater the viscosity of the nuclear test medium, the smaller the leakage error, and the more favorable it is for the measurement.

(3) The structure is simple and reliable (composed of housing, counter, oval gear and coupling, etc.), and the service life is long.

(4), resistant to high temperature and high pressure.

(5) The installation requirements are not high, and the change of flow state has little influence on the measurement accuracy. Therefore, there are no strict requirements on the straight pipe section before and after the flowmeter.

(6), easy to achieve local display and remote transmission.

Disadvantages:

(1) Oval gear flowmeter with large diameter is bulky and heavy. Larger diameters can generate noise and even vibrate the pipe.

(2) Oval gear flowmeters are generally not suitable for high and low temperature applications due to thermal expansion and deformation of parts at high temperatures, and brittle materials at low temperatures. At present, the usable temperature range is roughly -30~200℃, and the maximum pressure is 6.3Mpa.

(3) The oval gear flowmeter uses clean single-phase fluid. When it contains particles and is dirty, a filter needs to be installed upstream. It not only increases the pressure loss, but also increases the maintenance work. If the liquid containing gas is measured, a gas-eliminating filter must be installed to avoid measurement errors.

Oval gear flowmeters are mainly used for oil metering. Such as diesel, gasoline, kerosene, aviation gasoline, transformer oil, crude oil and other media. Usually, oval gear flowmeters are selected for measuring such media.

Resin, glue measurement
Hydraulic oil, lubricating oil, grease measurement
Fuel oil measurement
Ink, bitumen measurement
Liquid nitrogen, cryogenic liquid, solvent measurement
Edible oil, fish oil and food filling measurement
Chemical and anti-corrosion requirements for fluid measurement
Fluid Quantitative Control System

A matching filter shall be installed before the flowmeter, and the outlet of the matching filter is connected to the inlet of the flowmeter. The arrow points on both bodies are consistent with the flow direction of the liquid.
When the liquid under test contains gas, the gas elimination filter should be installed before the Flowmeter.
No matter whether the pipeline is installed vertically or horizontally, the oval gear in the flowmeter shall be installed in a horizontal position (i.e. the gauge disc shall be perpendicular to the ground).
When the flowmeter is properly installed. If it is not easy to read, turn the counter to 180 degrees or 90 degrees.
The new flowmeter pushes the elliptical gear several times from the exit with a bamboo stick before installation. If it doesn’t move, soak in diesel oil (Avoid sediment after factory check).
Flow control valve should be installed at the inlet of the Flowmeter, and open and close valve is installed at the outlet. When using open and close valve, start slowly. Do not suddenly open to prevent “water hammer” phenomenon.
Before installing the flowmeter on the new pipeline, the pipeline needs to be flushed. And the straight pipe section (instead of the position of the Flowmeter) is used to prevent welding slag, sundries and so on from entering the flowmeter.
It is strictly forbidden to check the flowmeter of cast iron and steel with water.
The flow size of the flowmeter in use shall not exceed the technical requirements. The flowmeter operates at a maximum flow rate of 50-80%.
If the tested liquid is chemically corrosive, a flowmeter of stainless steel should be selected.