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The V-cone flowmeter, like other differential pressure instruments, is also based on the principle of flow continuity and Bernoulli equation to calculate the flow rate of fluid conditions. We know that in the same closed pipeline, when the pressure decreases, the velocity will increase. When the medium approaches the cone, its pressure is P1. When the medium passes through the throttling area of the cone, the velocity will increase and the pressure will decrease to P2. As shown in the figure, both P1 and P2 are led to the differential pressure transmitter through the pressure port. When the flow rate changes, the differential pressure value will increase or decrease accordingly. That is to say, for stable fluids, the magnitude of the flow rate is directly proportional to the square root of the differential pressure. When the flow rate is the same, the larger the cone throttling area, the greater the differential pressure value generated.
 
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1. Wedge shaped block; 2. Measurement catheter; 3. Connect the flange; 4. Pressure collection catheter; 5. Apply pressure to the flange; 6. Double flange diaphragm differential pressure transmitter
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1. Measurement catheter; 2. Wedge shaped block; 3. Connect the flange; 4. Pressure collection catheter; 5. Apply pressure to the flange; 6. Double flange diaphragm differential pressure transmitter
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1. Especially suitable for measuring media with high viscosity, low Reynolds number, suspended particles or bubbles; 2. The permanent pressure loss is smaller than that of the orifice plate; 3. The wedge-shaped component has a special structural design, which has a guiding effect and prevents blockage; 4. It has compensation functions for fluid viscosity changes, temperature changes, density changes, etc; 5. Resistance to vibration, impact, dirt, and corrosion; 6. Equipped with bidirectional flow measurement function; 7. Good repeatability and high measurement accuracy, calibrated one by one before leaving the factory, with an accuracy of ± 0.5% (even uncalibrated ones can reach ± 3%); 8. The wedge-shaped flowmeter has a simple, sturdy, and highly reliable structure, easy installation, and low operation and maintenance costs; 9. No moving parts, wear-resistant, and do not require recalibration for long-term use. 10. It can measure corrosive media. As differential pressure measurement uses a diaphragm type double flange differential pressure transmitter, corrosive media cannot enter the pressure pipe and differential pressure transmitter. Therefore, as long as corrosion-resistant materials are used to process wedge-shaped throttling components, the instrument can ensure the measurement of corrosive media.
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| Applicable pipe diameter D |
15mm~300mm (DN300 and above can also be made) |
| Uncertainty |
± 1.0-1.5% FS (water calibration per unit at factory) |
| repeatability |
0.2~0.5% |
| Range ratio |
10:1 |
| Working pressure |
-0.1Mpa~6.4Mpa |
| operation temperature |
-50℃~400℃ |
| Minimum flow rate |
0.01m/s |
| Measure liquid viscosity |
Upper limit 500mPa. S |
| Reynolds number range |
Lower limit of 300, upper limit of 1 * 106 or above |
| Applicable Medium |
Water, sewage, gas, steam, high viscosity liquid, solid-liquid mixture type |
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| Nominal diameter D |
L (mm) |
Nominal diameter D |
L (mm) |
Nominal diameter D |
L (mm) |
| DN15 |
400 |
DN65 |
450 |
DN150 |
600 |
| DN25 |
400 |
DN80 |
480 |
DN200 |
620 |
| DN40 |
400 |
DN100 |
520 |
DN250 |
650 |
| DN50 |
400 |
DN125 |
550 |
DN300 |
700 |
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| model |
Remarks |
| HLGX |
Wedge Flow meter |
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code |
Classify by structural features |
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Y |
Integrated wedge flowmeter |
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F |
Separated wedge flowmeter |
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code |
Nominal pressure (MPa) |
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1.6 |
1.6 |
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2.0 |
2.0 |
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2.5 |
2.5 |
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4.0 |
4.0 |
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6.4 |
6.4 |
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code |
caliber |
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15-300 |
DN15-DN300 |
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code |
medium |
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1 |
liquid |
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2 |
gas |
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3 |
steam |
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code |
Compensation form |
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N |
Without pressure or temperature compensation |
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P |
With pressure compensation output |
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T |
Equipped with temperature compensation output |
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code |
Differential pressure range of transmitter |
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1 |
Medium differential pressure range |
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2 |
High differential pressure range |
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code |
Is there an on-site display |
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W |
Throttle device sensor |
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X |
Intelligent throttling device (flowmeter) |
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1. Pipe diameter: pipe diameter, wall thickness, material 2. Measuring medium 3. Medium temperature (℃) 4. Working pressure of medium (MPa): maximum pressure, normal pressure, minimum pressure 5. Medium working flow rate (m3/h, kg/h, Nm3/h): maximum flow rate, normal flow rate, minimum flow rate 6. Medium viscosity (mPa. s) 7. Medium density (kg/m3)
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1. Ensure that the fluid flow in the pipeline adjacent to the upstream of the wedge flowmeter approaches a typical fully developed turbulent flow state without vortices. 2. Ensure that the difference in the average inner diameter of the pipeline with at least 2D length on the upstream side of the wedge flowmeter does not exceed ± 3% of the average inner diameter. 3. Wedge flow meters can be installed and used on pipelines with the same nominal diameter as horizontal or vertical pipelines. The inner wall of the pipeline should be smooth, clean, and free of attachments. When installing vertically, when measuring liquids, the fluid should flow from bottom to top, and attention should be paid to making the wedge-shaped flowmeter easy to remove bubbles to avoid causing zero drift of the instrument.
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The upstream and downstream sides of the wedge-shaped flowmeter should be equipped with straight pipe sections, and the length of the straight pipe sections is shown in the following table
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| Shortest straight pipe section on the upstream side (value multiplied by a multiple of the inner diameter D of the pipeline) |
Wedge ratio |
| Bend 90 ° |
T-shaped tee |
ball valve |
Gate valve (fully open) |
H/D |
| 6 |
6 |
10 |
6 |
0.2 |
| 8 |
8 |
11 |
6 |
0.3 |
| 12 |
12 |
14 |
8 |
0.4 |
| 14 |
14 |
16 |
10 |
0.4 |
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| Fault phenomenon |
cause |
Solution |
| No differential pressure signal output |
High and low pressure balls not opened |
Open the high and low pressure valves |
| The balance valve is not tightened |
Tighten the balance valve |
| Inaccurate differential pressure indication |
Differential pressure range mismatch |
Adjust the transmitter range |
| Zero drift of differential pressure gauge |
Perform zero position correction |
Note: If the reading is unstable during operation and there are no other reasons, the exhaust engine can be used to troubleshoot this issue.
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Comes with attachments Measurement catheter, pressure tapping catheter, pressure tapping flange, connecting flange Optional Accessories Rinse ring, ball valve, globe valve, condenser, collector, isolator, settler Optional related products Double flange differential pressure transmitter, flow integrator, temperature transmitter, pressure transmitter
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