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technical article
The best choice is a v-cone flowmeter
2012-2-3 10:34:47


Straight pipe section requirements are low: the Boer equation requires that the measured fluid is an ideal fluid, which is simply impossible in practical applications. In many cases, the fluid distribution is uneven, such as elbows, valves, shrinkage, expansion, pumps, Tee

Wait, this is a difficult problem for other meters. 可在极为恶劣的情况下均匀流体分布,如在紧邻仪表上游有单弯管,双弯管,经过锥体“整流” V-cone flowmeter can evenly distribute fluid in extremely harsh conditions, such as single elbow, double elbow immediately upstream of the meter, and “rectify” by cone

The relatively uniform fluid distribution can ensure that the instrument can obtain higher measurement accuracy under harsh conditions. Because the V-cone flowmeter can evenly distribute the fluid curve, it compares with other types of differential pressure flowmeters for straight pipe sections upstream and downstream.

The requirements are small, and it is recommended to leave a straight pipe section of 0-3D upstream and a straight pipe section 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, tests have been carried out with a single elbow at 90 ° C or two double elbows that are not on a plane upstream of the V-type flowmeter. The test results show that the V-cone flowmeter can Place a

Elbows or double elbows that are not on the same plane do not affect measurement accuracy.

1. High accuracy: The accuracy of the V-cone flowmeter 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 instrument).

2. Good repeatability: The repeatability of the V-cone flowmeter is very good, which is ± 0.1%.

3. Wide range ratio: The range of the V-cone type flowmeter is much larger than that of other types of differential pressure flowmeters, which is 10: 1 under normal circumstances, and can be increased if necessary. When the Reynolds number is higher than 8000, the output signal is linear.

8000 can also be measured, but the output signal needs to be corrected according to the curve.

特有结构所形成的边界层效应,使节流件关键部位不会磨损,因此可以保持几何尺寸长期不变,因此能长期稳定工作而无须标定。 The boundary layer effect formed by the unique structure of the V-cone flowmeter makes the key parts of the throttling part not wear, so it can keep the geometric size unchanged for a long time, so it can work stably for a long time without calibration.

V cone flowmeter is a pure 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.


When V cone flowmeter is installed and applied in the field, it can adapt to the measurement of a large number of media, the application is relatively simple, the stability is high, and the installation is relatively simple. But for the site, in order to ensure the stability of the site operation, I need

They perform normal maintenance.

1: Before installation, measurement verification must be performed. After confirming the compliance with various technical indicators, installation can be strictly performed in accordance with the installation requirements of signal pipelines and differential pressure gauges. For different media, we need to refer to the relevant

Standards carry out different installations and identifications to achieve one-to-one correspondence.

2. When put into use, the air must be removed from the exhaust valve at the highest position of the signal pipeline.

3. Regularly clean signal pipelines and differential pressure flowmeters to clear all debris.

4. Before use, check the zero position. When checking the zero position, close the two pilot valves on the instrument valve and open the balance valve. If the zero position is found, the cause should be found and adjusted.

5. If there is a significant difference between the displayed value of the differential pressure flowmeter and the measured value, a comprehensive inspection and adjustment shall be carried out, and the measurement verification shall be carried out again.


技术特点: V cone flowmeter technical characteristics:

1. Low installation requirements: straight 0 ~ 3D straight pipes, and rear 0 ~ 1D straight pipe sections;

2. Wide range ratio: usually 10: 1, choosing the right parameter can achieve a maximum of 50: 1;

3. Small pressure loss: the same β value, the pressure loss is 1/3 ~ 1/5 of the orifice plate;

4. Abrasion resistance: After the streamlined cone is throttled, a vacuum layer effect is generated on the surface of the cone, making the cone difficult to wear;

5. Non-clogging and non-adhesion: The cone-shaped thorough purging design avoids the retention of residues, condensates or particles in the fluid;

6, long-term stability is good: β value can be unchanged for a long time, and ensure long-term accurate measurement;

7, high precision: 0.5 level;

8. Good repeatability: better than 0.1%;

9. Signal stability: "Signal fluctuation" is 1/10 of the orifice flowmeter;

传感器独特的几何形状允许有广泛的β值范围; 10. Wide β value range: The unique geometry of the V-cone flow sensor allows a wide range of β values;

11. Wide caliber range: DN25 ~ DN2000;

12. Measurable high-temperature and high-pressure media: working temperature up to 850 ℃, maximum pressure 40MPa;

13. Measurable dirty media (coke oven gas, blast furnace gas, raw oil, residue oil, etc.);

14. Measurable gas-liquid two-phase medium (moisture, condensate, etc.);