HLV Pipeline type Velbar flowmeterDetailed product description：

1、 Overview of Weiliba flowmeter
The most advanced differential pressure flow measurement technology
The HLV Velbar flowmeter adopts an engineering structural design that fully complies with aerodynamic principles, and is a sensing element that has achieved unparalleled excellence in accuracy, efficiency, and reliability.
2、 Main technical indicators of Weiliba flowmeter
1. Performance indicators of Weiliba flow measurement system
Measurement accuracy: ± 1 Repeatability accuracy: ± 0.1
Applicable pressure: 0-40MPa Applicable temperature: -180 ℃~+550 ℃
Measurement upper limit: depends on probe strength Measurement lower limit: depends on the minimum differential pressure requirement for measurement
Range ratio: greater than 10:1
Applicable pipe diameter: 38mm~9000mm round pipe, square pipe
Applicable media: Full tube, unidirectional flow, unidirectional gas, steam, and liquid with viscosity not exceeding 10 centipoise
The application range of Veliba is extremely wide, and it is widely used in various gases, liquids, and vapors
Measurement of steam, the following are typical application media.
Gas/Liquid/Steam
Natural gas/cooling water/saturated steam
Compressed air/boiler water/superheated steam
Gas/desalinated water
Gas hydrocarbons/liquid hydrocarbons
Hot air/low-temperature liquid
Furnace gas/heat transfer liquid

3、 Introduction to the working principle of HLV pipeline type Velbar flowmeter
When fluid flows through the probe, a high-pressure distribution area is generated in its front, and the pressure in the high-pressure distribution area is slightly higher than the static pressure of the pipeline. According to the Bernoulli equation principle, the velocity of the fluid increases as it flows through the probe, creating a low-pressure distribution area at the back of the probe. The pressure in the low-pressure distribution area is slightly lower than the static pressure of the pipeline. After the fluid flows through the probe, a partial vacuum is generated at the back of the probe, and vortices appear on both sides of the probe. The cross-sectional shape, surface roughness, and position of the low-pressure tapping hole of the average velocity flow probe are key factors determining the performance of the probe. The stability and accuracy of low-voltage signals play a decisive role in the accuracy and performance of the uniform velocity probe. The Weiliba average velocity flow probe can accurately detect the average differential pressure generated by the average velocity of the fluid. The Weiliba average flow probe has multiple pairs of pressure tapping holes arranged according to certain criteria in the high and low pressure areas, making it possible to accurately measure the average flow velocity

4、 Measurement principle of Weiliba flowmeter
HLV Velbar flowmeter is a plug-in flow measurement instrument. Insert a Velbar sensor into the pipeline, and when fluid flows through the sensor, a high-pressure distribution area is generated in the upstream direction and a low-pressure distribution area is generated in the downstream direction. Sensors in high and low pressure areas have multiple pairs arranged according to certain rules, usually three pairs of pressure tapping holes, to measure the total pressure of the fluid, including static pressure, average velocity pressure Pl, and static pressure P2. P1 and P2 are respectively introduced into differential pressure transmitters to measure the differential pressure △ P=P1-P2. △ P reflects the magnitude of the average velocity of the fluid, and the flow rate of the fluid can be calculated accordingly.

Technical parameters and applications

model	HLV650	HLV640	HLV630
Outline drawing
Diameter range	80~500mm	50~5000mm	50~2000mm
Applicable Medium	Air, coal gas, flue gas, natural gas, tap water, boiler feedwater, and corrosive solutions; Saturated steam and superheated steam are equipped with condensers, etc		Gas, liquid, steam
pressure range	Usually O~40.0MPa	Usually 0~2.5MPa	Usually 0~10.0MPa
temperature range	Usually -80~550 ℃	Usually -80~300 ℃	Usually -80~550 ℃
turndown ratio	Greater than 10:1	Greater than 10:1	Greater than 10:1
Minimum flow velocity	Gas ≥ 3.5m/s Liquid ≥ 0.6m/s Steam ≥ 9m/s	Gas ≥ 3.5m/s Liquid ≥ 0.6m/s Steam ≥ 9m/s	Gas ≥ 10m/s Liquid ≥ 1m/s Steam ≥ 12m/s
measurement accuracy	Shi 1	Shi 1	Shi 1
repetitiveness	±0.1	±0.1	±0.1
connection method	Overall welding	Online installation and adjustment	Adjustable flange connection
matching instrument	Differential pressure transmitter, flow integrator, etc
model	HLV620	HLV610	HLV600
Outline drawing
Diameter range	50~4000mm	50~5000mm	12~50mm
Applicable Medium	Air, coal gas, flue gas, natural gas, tap water, boiler feedwater, and corrosive solutions; Saturated steam and superheated steam are equipped with condensers, etc		Gas, liquid, steam
pressure range	Usually O~40.0MPa	Usually 0-4MPa	Usually 0~10.0MP a
temperature range	Usually -80~550 ℃ Special: 700 ℃	Usually -80~550 ℃	Usually -80~300 ℃
turndown ratio	Greater than 10:1	Greater than 10:1	Greater than 10:1
Minimum flow velocity	Gas ≥ 3.5m/s Liquid ≥ 0.6m/s Steam ≥ 9m/s	Gas ≥ 3.5m/s Liquid ≥ 0.6m/s Steam ≥ 9m/s	Gas ≥ 10m/s Liquid ≥ 1m/s Steam ≥ 12m/s
measurement accuracy	Shi 1	Shi 1	Shi 1
repetitiveness	±0.1	±0.1	±0.1
connection method	Overall welding	Threaded rod connection	Flange or threaded connection
matching instrument	Differential pressure transmitter, flow integrator, etc

HLV pipeline type Velbar flowmeter