Product Description:
1、 Product Overview:
The LGV series V-cone flowmeter utilizes the throttling effect generated by the V-cone in the flow field to measure flow rate by detecting the upstream and downstream pressure difference. Compared with ordinary throttling components, it has changed the throttling layout from central orifice throttling to annular throttling. Practical use has proven that compared with other flow meters, this flowmeter has the advantages of high long-term accuracy, good stability, limited installation conditions, wear resistance, wide measurement range, low pressure loss, and suitability for contaminated media. Moreover, the V-cone itself, as a rectifier for the flow field, has become a new type of flowmeter with excellent performance.
Moreover, the V-cone itself, as a rectifier for the flow field, has become an excellent new type of flowmeter with d. u characteristics. The V-cone flowmeter, composed of a V-cone sensor, differential pressure transmitter, and intelligent flow integrator, can accurately measure the flow of various media within a wide Reynolds number range (8 × 103 ≤ Re ≤ 5 × 107). Nowadays, the V-shaped cone has achieved international standardization, but it is still a hot topic in the international flow measurement community. I believe that in the near future, with in-depth research and the improvement of theoretical and experimental data, it will become a member of the standard throttling device, just like standard orifice plates, standard nozzles, and classical Venturi flow meters.
2、 Working principle:
The LGV series V-cone flowmeter includes a pointed cone and corresponding pressure tapping ports coaxially installed in a measuring tube. The measuring tube is precision machined, and a differential pressure is generated at both ends of the pointed cone. The high pressure (positive pressure) of the differential pressure is the static pressure measured at the pipe wall before the upstream fluid shrinks, while the low pressure (negative pressure) is taken from the pressure at the center axis hole of the cone facing downstream.
The direction of the cone is towards the incoming flow, and there is a sharp angle between the cone and its tail surface. The edge of this intersection creates a smooth transition zone for the fluid before entering the downstream low-pressure zone.
Due to the fact that the fluid is not forced to contract near the central axis of the pipeline and is not a barrier that causes the fluid to change its flow direction, the novel V-cone throttling device is used to gradually contract the fluid towards the inner wall of the pipeline, giving the V-cone flowmeter a series of advantages. The low-pressure side generates high-frequency and low amplitude small eddies, so the differential pressure measured by the differential pressure transmitter is a low-noise signal, which can enable the differential pressure transmitter to measure with high resolution, thereby enabling the V-cone to achieve a wide range ratio and good repeatability.
The square root of the differential pressure value generated by the flow sensor is directly proportional to the flow rate:
Qv=（c.ε）/（1－β4 ）0.5.（π/4）.d2.0.5
Among them: Qv： Fluid volume flow rate
C： Outflow coefficient;
ε： Fluid expansion coefficient;
β： Throttling ratio;
d： Diameter of throttling element;
ΔΡ： Differential pressure value;
ρ1： Fluid working condition density.
3、 Application, conditions, and maintenance:
Media: coal gas, natural gas (including humidity below 5%), various hydrocarbons (including humid HC gases), various rare gases (hydrogen, helium, argon, oxygen, nitrogen, etc.), wet chloride gases, air (including air containing water, SiO2 particles, and other suspended solids), flue gas, saturated steam (including two-phase flow of steam and water), superheated steam, water, etc.
Conditions: From cryogenic to supercritical state, with a high temperature of 700 ℃ and a pressure of 40Mpa.
Calculation: Each cone is calculated using specialized software based on the properties, pressure, and temperature of the fluid. Users can choose the beta value based on their application conditions (composition of the measured medium, temperature, pressure, pipe diameter, high flow rate, common flow rate, low flow rate, allowable pressure loss).
Maintenance: The conical flowmeter is maintenance free and does not require regular maintenance and calibration.
4、 Main features:
1. The accuracy can reach up to 0.5%.
2. The typical range ratio is 15:1, which can have a range ratio of at least 10:1, far superior to traditional flow meters such as orifice plates and nozzles.
3. The repeatability is better than ± 0.1%.
4. The straight pipe section required for installation is very short, with upstream requirements ranging from 0 to 3D and downstream requirements ranging from 0 to 1D; There is no need to install a flow regulator upstream of the V-cone. Greatly saves costs and installation space under fixed working conditions.
5. The structure design of the flowmeter is a fluid sweep type structure, which cannot intercept any gas, liquid or solid impurities carried in the fluid. It is very suitable for flow measurement of dirty fluids, such as coke oven gas, wet gas, etc.
6. The specially designed inner cone can reduce the amplitude of pulsation (oscillation) in the measured pressure (differential pressure) field, thereby reducing the noise in the differential pressure signal. Can measure smaller flow rates, expanding the range ratio.
7. No movable parts, high reliability, and less prone to jamming.
8. When fluid flows through an inner cone with a special profile, a boundary layer is formed around it and guides the fluid away from the edge of the cone tail, thereby reducing the possibility of wear and ensuring its stable performance.
9. Low pressure loss, minimal energy loss, and dirt resistance. Suitable for low static pressure fluid flow measurement applications, such as flue gas.
10. Easy to install, it is an ideal flowmeter for technological transformation.
11. Maintenance free or low maintenance workload, with flow adjustment and mixing effect on fluids.
5、 Technical parameters:
1. Nominal longitude: 50mm ≤ DN ≤ 1800mm;
2. Nominal pressure: PN≤40Mpa；
3. Reynolds number range: 8 × 103 ≤ Red ≤ 107;
4. Accuracy level: 0.5 level, 1.0 level;
5. Repeatability: ≤ 0.1％；
6. Front straight pipe section: 1-3D, rear straight pipe section: 3-5D;
7. Small pressure loss: only 1/2 to 1/3 of the orifice plate;
8. The vortex generated at the rear edge of the cone is small, the negative pressure side output is stable, the fluctuation is small, and the stability is good;
9. Wide range ratio: The flow range can reach: 1: 15.
Flange type:
1. Connection method: flange (flat welding and butt welding);
2. Caliber: DN15～DN2000；
3. Pressure tapping method: socket welding, flange, thread;
4. Pressure: 0-40MPa;
5. Temperature:- 40～850℃；
6. Material: 304 stainless steel, 316L stainless steel, 20 # carbon steel (see selection table for details);
7. Applications: liquids, gases, vapors;
8. Applicable media: Widely used for flow measurement in industries such as municipal, power, chemical, petrochemical, metallurgy, and food processing, almost applicable to all gas and liquid media.
Direct welding type:
1. Connection method: directly welded to the process pipeline;
2. Caliber: DN15～DN2000；
3. Pressure tapping method: socket welding, flange, thread;
4. Pressure: 0-40MPa;
5. Temperature:- 40～850℃；
6. Material: 304 stainless steel, 316L stainless steel, 20 # carbon steel;
7. Application: Oil pipeline, gas pipeline, steam pipeline network, high-pressure process pipeline.
5、 Technical parameters:
1. Nominal longitude: 50mm ≤ DN ≤ 1800mm;
2. Nominal pressure: PN≤40Mpa；
3. Reynolds number range: 8 × 103 ≤ Red ≤ 107;
4. Accuracy level: 0.5 level, 1.0 level;
5. Repeatability: ≤ 0.1％；
6. Front straight pipe section: 1-3D, rear straight pipe section: 3-5D;
7. Small pressure loss: only 1/2 to 1/3 of the orifice plate;
8. The vortex generated at the rear edge of the cone is small, the negative pressure side output is stable, the fluctuation is small, and the stability is good;
9. Wide range ratio: The flow range can reach: 1: 15.
Flange type:
1. Connection method: flange (flat welding and butt welding);
2. Caliber: DN15～DN2000；
3. Pressure tapping method: socket welding, flange, thread;
4. Pressure: 0-40MPa;
5. Temperature:- 40～850℃；
6. Material: 304 stainless steel, 316L stainless steel, 20 # carbon steel (see selection table for details);
7. Applications: liquids, gases, vapors;
8. Applicable media: Widely used for flow measurement in industries such as municipal, power, chemical, petrochemical, metallurgy, and food processing, almost applicable to all gas and liquid media.
Direct welding type:
1. Connection method: directly welded to the process pipeline;
2. Caliber: DN15～DN2000；
3. Pressure tapping method: socket welding, flange, thread;
4. Pressure: 0-40MPa;
5. Temperature:- 40～850℃；
6. Material: 304 stainless steel, 316L stainless steel, 20 # carbon steel;
7. Application: Oil pipeline, gas pipeline, steam pipeline network, high-pressure process pipeline.
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