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technical article
V cone flowmeter features
2011-6-4 16:53:16

Dongxiang instrument technicians have summarized several characteristics of v-cone flowmeters:

1. High accuracy : V-cone flowmeter [The accuracy is ± 0.5% of the measured value, and the trade measurement level is ± 0.3% (the system accuracy needs to refer to the accuracy of the application bar and secondary instruments).
2. Good repeatability : The repeatability of V-cone flowmeter is very good, which is ± 0.1%.

3. Wide measuring range : The measuring range of the V-cone type flowmeter is much larger than that of other types of differential pressure flowmeters , which is normally 10: 1, and can be increased if necessary. When the Reynolds number is higher than 8000, the output signal is linear. If it is lower than 8000, it can be measured, but the output signal needs to be corrected according to the curve.
4. Low requirements for straight pipe sections : The Boer equation requires that the measured fluid be an ideal fluid, which is simply impossible in practical applications. In many cases, the fluid distribution is uneven, such as elbows, valves, shrinkage, and expansion. Pumps, tees, etc. are a difficult problem for other instruments. The V-cone flowmeter can evenly distribute the fluid under extremely harsh conditions. For example, there are single elbows and double elbows immediately upstream of the meter. After the cone “rectification”, the fluid distribution is more uniform to ensure that the meter can obtain under severe conditions. Higher measurement accuracy. Because the V-type flowmeter can evenly distribute the fluid curve, compared with other types of differential pressure flowmeters, the requirements for the upstream and downstream straight pipe sections are less. It is recommended to leave 0-3D straight pipe sections upstream during installation. , Leave a straight tube of 0-1D downstream. When the size of the user's pipeline is large, the price of the pipeline is high, or the straight pipe section is not enough, the V-cone flowmeter will be the best choice. In the past ten years, the test has been performed on a single bent pipe at 90 ° C or two double bent pipes that are not on a plane upstream of the V-type flowmeter. The test results show that the V-cone type flowmeter can be used next to it. There is an elbow or a double elbow that is not on the same plane without affecting the measurement accuracy.
The boundary layer effect formed by the unique structure of the flow meter prevents the key parts of the throttle from being worn, so it can keep the geometric size unchanged for a long time, so it can work stably for a long time without calibration.
The flow meter is a purely mechanical body, so it is resistant to high temperature, high pressure, corrosion and vibration.
Wide range of measurable fluids (liquid, gas, steam), wide measurement range (small flow to large flow), applicable pipe diameters DN15 to DN3000.
The tower (V-shaped cone) flow meter has the same principle as other differential pressure flow meters, and is also a throttled differential pressure flow meter. The appearance of the tower (V-shaped cone) broke the structure pattern that has been inherited for nearly a century, making the throttled differential pressure instrument a "qualitative leap". The major breakthrough of the tower-shaped (V-cone) flowmeter lies in "variable fluid shrinkage in the center of the pipe center to the side wall shrinkage". The flow meter uses a number of patented technologies such as multi-hole pressure extraction, ring chamber pressure extraction, and integrated installation. Widely used in the measurement of particularly dirty fluids (such as: coke oven gas, blast furnace gas, etc. in steel plants).