V-cone flow meter is also known as cone-type flow meter; inner cone flow meter; integrated V-cone flow meter. The principle of V-cone flow meter is the same as other DP flow meters, and it is also a throttling DP flowmeter.;

V-Cone Flow Meter

The basic principle of the V-cone flow meter is the same as that of other types of differential pressure flowmeters. They are based on the principle of energy conservation in the sealed pipeline. The V-cone flow meter is a cone-shaped shutoff piece suspended in the center of the pipeline, and the cone-shaped piece hinders the flow of the medium. Reshape the flow rate curve. Measuring media include water, steam, air, natural gas, nitrogen, coke oven gas, etc. The maximum working temperature is 450℃, and the maximum pressure is 40Mpa.

Sino-Inst, Manufacturer for differential pressure flow meters. Including the Orifice plate, Venturi, Annubar, etc. Suitable for liquid, gas, and steam flow measurement. Please contact our sales engineers for technical support!

Features of V-Cone Flow Meter

  • Low installation requirements. The first 0~3D straight pipe, the rear 0~1D straight pipe section;
  • Wide range ratio. It is usually 10:1, and it can be up to 50:1 by selecting appropriate parameters;
  • The pressure loss is small. For the same β value, the pressure loss is 1/3~1/5 of the orifice;
  • Wear resistance. After the streamlined cone is throttled, a vacuum layer effect is produced on the surface of the cone, making the cone not easy to wear;
  • No clogging, no adhesion. The conical thorough purging design avoids the retention of residue, condensate or particles in the fluid;
  • Long-term stability is good. β value can be unchanged for a long time, and long-term accurate measurement is guaranteed;
  • High accuracy: 0.5 level;
  • Good repeatability. Better than 0.1%;
  • The signal is stable. “Signal fluctuation” is 1/10 of the orifice;
  • Wide β value range. The unique geometry of the V-cone flow sensor allows a wide β value range;
  • Wide range of caliber: DN25~DN2000;
  • Measurable high-temperature and high-pressure media: the maximum working temperature is 850℃, and the maximum pressure is 40MPa;
  • Can detect dirty media (coke oven gas, blast furnace gas, raw oil, residual oil, etc.);
  • Measurable gas-liquid two-phase medium (humidity, condensate, etc.);

V-Cone Flow Meter Specification

Long-term stability:± 0.1% F.S / Y
Output:4~20mA
Repeatability:± 0.1%
Minimum flow velocity:0.1m
Turndown ratio: Normally15:1; max50:1
Reynolds number range: 8 × 103 ~ 5 × 106
Operating pressure:≤ 16MPa, 42MPa(maximum)
Operating temperature: -160 °C ~ 700 °C
Nominal diameter:φ15~φ2000 (1/2″~120″)
Environment temperature: ≤ 80 °C

Extended reading: Integral DP Flow Meter|Gas, liquid, steam|Compact structure

V-Cone Flow Meter Applications

V-Cone Flow Meter can successfully measure fluids:

  1. Gas:
    Gas: coke oven gas, blast furnace gas, city gas;
    Natural gas: includes natural gas with a moisture content of more than 5%;
    Various hydrocarbon gases: alkanes, olefins and other gases;
    Various gas production: hydrogen, helium, argon, oxygen, nitrogen, etc.;
    Corrosive gas: wet chloride gas, etc.;
    Air: including air containing water, dust, compressed air, etc.;
    Flue gas: flue gas discharged from various boilers and heating furnaces;
  2. Steam: saturated steam, superheated steam;
  3. Liquid
    Oils: crude oil, fuel oil, water-containing emulsified oil, diesel, hydraulic oil, etc.;
    Water: raw water, drinking water, production water, sewage, etc.;
    Various aqueous solutions: acid, alkali, saline solution, etc.;
    Organic chemicals: methanol, ethylene glycol, xylene, etc.;
  4. Special fluid
    Oil + HC gas + sand;
    Aerated water: H2O+N2+air; H2O+CO2, etc.;

Extended reading: Flow Measurement of Nitrogen

veris flow measurement group

Armstrong International’s Veris – Flow Measurement solutions provide outstanding flow measurement technology to meet the critical needs for your environment. Their Verabar and Accelabar patented solutions deliver consistent, accurate and reliable flow measurement to handle a wide variety of liquids, gases and steam.

The metal Rotameter flow meter is suitable for the flow measurement of small-diameter and low-velocity media. It can measure most media such as gas and liquid.

The metal Rotameter flow meter can measure the instantaneous flow and cumulative flow of gases and liquids, including corrosive acid, alkali, and salt solutions. It is especially preferred when the flow is low or when a purely mechanical or inconvenient power supply is required.

Rotameter flow meters are mostly vertical installation, bottom entry, and top exit type, and can also be installed horizontally. The price is higher. Let me show you a sample.

Rotameter-flow-meter-explosion-proof-applications

This is an explosion-proof type for measuring corrosive liquids.

Rotameter-flow-meter-Smart-Applications

This is a smart type. It can measure gas and liquid. There should be no impurities.

Rotameter-flow-meter-to-measure-nitrogen

This one is installed horizontally to measure nitrogen. It is purely mechanical to display instantaneous flow rate.

V-Cone Flow Meter Working Principle

The V-cone flow meter is a differential pressure flow meter. The flow meter designed on the principle of differential pressure has been applied for more than 100 years.

The principle of differential pressure is based on the principle of energy conversion in a sealed pipeline. That is to say, for a stable fluid, the flow rate is proportional to the square root of the flow rate of the medium in the pipeline.

When the medium is close to the cone, its pressure is P1. When the medium passes through the intercepting area of ​​the cone, the speed increases and the pressure decreases to P2. Both P1 and P2 are led to the differential pressure transmission through the tapping port of the cone flowmeter When the flow rate changes, the differential pressure between the two pressure taps of the cone flowmeter will increase or decrease.

The calculation formula used by the V-cone flow meter for flow calculation is the same as other differential pressure flow meters. However, the unique design of its intercepting element forces the medium in the center of the pipeline to flow around the cone. Compared with other differential pressure flowmeters. There are many advantages.

We can understand the performance of the cone flowmeter with the help of the ideal flow rate curve distribution. The fluid in the pipeline is not disturbed or hindered, which is what we call the ideal flow state. Its flow velocity is evenly distributed, and the flow velocity near the pipe wall is almost zero.

The flow velocity in the center of the pipe reaches the maximum. The flow velocity near the pipe wall is almost equal to Zero. It is caused by the friction of the pipe wall against the medium. Because the cone is suspended in the center of the pipeline, it is directly in contact with the high-speed area of ​​the fluid, forcing the fluid in the high-speed area to mix with the fluid in the low-velocity area near the pipe wall to make the flow rate uniform.

Therefore, even if the flow rate is very low, the cone flowmeter can still make the fluid and the highest flow rate in the center of the pipe continuously interact to produce the correct differential pressure.

V-Cone Flow Meter Calculation

The simplified formula is:

V-Cone Flow Meter Calculation
V-Cone Flow Meter Calculation
V-Cone Flow Meter Calculation
V-Cone Flow Meter Calculation

Where:
QV-fluid volume flow m³/h
Cd-outflow coefficient
βV—Equivalent diameter ratio
dV—is the maximum diameter of the cone, D is the inner diameter of the pipe
ρ—Density under fluid conditions
ε-gas expansion coefficient

In reality, it is difficult to distribute the flow rate uniformly, and any changes in the pipeline may affect the fluid. Such as: bay head, valve, reducing diameter, expanding diameter, pump, tee, etc. The cone flowmeter uses a cone to reshape the upstream flow velocity distribution curve. Even in extremely harsh conditions, measurement accuracy can still be guaranteed.

Extended reading: [Working principle&Price]SI3051ANB Annubar Flow Meter

  1. If the medium has particulate impurities, it is easy to block.
  2. The pressure loss is the largest in the non-movable components such as electromagnetic, vortex, thermal, and Vera, and the flowmeter based on the principle of non-orifice plate. There will be about 10~20% pressure loss. The pressure loss will be even greater if several sets are used on one pipeline.
  3. If the V-cone flow meter is broken, it must be removed. Downtime for many businesses is troublesome.
  4. Because it is a differential pressure type, pressure and temperature compensation are required. And these two compensation probes are more prone to damage than the flowmeter.
  5. The range ratio of v-cone flowmeter is small, generally 1:10, good to 20. The electromagnetic energy generally reaches 100. Except for electromagnetic and thermal, other flowmeters have a lot of drop in measurement accuracy on small flow, or even can not measure.

V-Cone Flow Meter Installation

1.Pipeline flange type:

Refers to the installation flange at both ends of the flowmeter. It is connected with the installation flange (also called user flange) of the same specification at both ends of the process pipeline. It is a more commonly used structure.

The applicable caliber (DN50mm~3000mm). This form is suitable for split installation of throttling device and differential pressure transmitter. It is generally used when measuring steam flow. It can also be used when measuring other high-temperature media.

2.Flange clamping type:

Used for the installation of small-mouth flow meters. Only 2 flanges are required for each flowmeter process pipeline. The flange and the process pipeline are welded together. Then clamp the flowmeter between the two flanges. The installation method here is the same as that of the vortex flowmeter (≤300mm).

3.Small-caliber integrated type:

Suitable for fluids with a diameter of ≤DN40mm and a medium temperature of ≤120℃. The structure is to directly combine the differential pressure transmitter with the tower flow meter into a whole.

There is no pressure guiding tube, pressure taking valve, three valve group between the two. Make the installation very simple (the same as the vortex flowmeter installation method). When the differential pressure transmitter adjusts the zero point, the valve of the process pipeline needs to be closed, and then the zero can be adjusted.

Note: This installation method cannot be used to measure high-temperature media. It is because the high-temperature media will enter the measuring room of the differential pressure transmitter and damage the measuring diaphragm of the transmitter.

4.Pipeline butt welding type:

Refers to the tower flowmeter and the process pipeline cannot be connected by flange (the flowmeter body cannot be flanged). The flowmeter and the process pipeline are directly welded together during installation. The cost of this structure is relatively low (the cost of 4 flanges is reduced), and it is a one-time installation. Generally used in larger diameter occasions.

5.Conventional fluid integration type:

Refers to the fluid whose medium temperature is ≤120℃. Applicable pipe diameter: DN50~DN3000. According to different fluids and user requirements, the manufacturer welds (or assembles) valves and three-valve groups on the flowmeter before leaving the factory. The user can assemble the flowmeter and transmitter together when installing on site.

6.Steam integrated type:

It means to assemble the transmitter and the tower flowmeter together when measuring the steam flow. Between the transmitter and the flowmeter, we must assemble the “three-valve group dedicated for steam” of our company. So cancel The pressure guiding tube is greatly simplified and the pressure taking structure is greatly simplified.

7.Liquid antifreeze type:

Refers to the “liquid special isolation tank” installed by our company between the tower flowmeter and the transmitter. The tank contains a special medium, which can not freeze at a lower temperature. This installation method is used when measuring liquids, especially when the outdoor environment is relatively low. The liquid in the measuring chamber of the transmitter is easy to freeze and damage the transmitter.

8.Square pipe flange type:

Refers to the process pipe is a square pipe. The flow meter measuring pipe is a round pipe. The two are connected by a special “square-circle” connector.

  1. Flange, clamp connection type

The V-cone flow sensor is a straight pipe section with flanges. The v-cone is placed inside the tube. Weld the same flange on the process pipe and assemble it with the v-cone flow sensor.

When the V-cone flow sensor is installed on a vertical pipe, the fluid should flow from bottom to top. Since the positive and negative pressure inlets are not on the same level, necessary corrections should be made to their heights.

Diameter range Throttle upstream downstream
All 1 elbow 1D 1D
2 elbows 1D 1D
tee joint 1D 1D
Butterfly valve (control valve) 10D when not ideal 5D downstream of valve
Butterfly valve (stop valve) 5D 3D
Ball valve (cut-off) 1D 1D
Heat exchanger (depending on type) 1D 0D
Expanding tube (0.67D-D) length 2.5D 2D 2D
Reducer (3D-1D) length 3.5D 1D 1D
  1. Welding type

The V-cone flow sensor can be permanently welded in the pipeline as a part of the pipeline because of its very good wear resistance and the fluid purging around the V-cone, making it self-cleaning.

Requirements for upstream and downstream straight pipe sections:
Gas measurement, Reynolds number range (Re) > 200,000, β value greater than or equal to 0.65

Requirements for upstream and downstream straight pipe sections:
Liquid measurement, Reynolds number range (Re)≤200,000, β value greater than or equal to 0.65

Diameter range Throttle upstream downstream
All 1 elbow 1D 1D
2 elbows 1D 1D
tee joint 1D 1D
Butterfly valve (control valve) 3D in less than ideal locations Valve Downstream 3D
Butterfly valve (stop valve) 3D 3D
Ball valve (cut-off) 0D 0D
Heat exchanger (depending on type) 0D 0D
Expanding tube (0.67D-D) length 2.5D 1D 1D
Reducer (3D-1D) length 3.5D 1D 1D

Frequently
Asked
Questions

V-cone flowmeter, also known as; V-cone flowmeter; V-cone flowmeter; Cone flowmeter; Cone flowmeter; Inner cone flowmeter; Inner cone flowmeter.

Integrated V-cone flowmeter V-cone flowmeter (V-cone flowmeter) is a differential pressure flowmeter developed in the 1980s. Its successful development is a qualitative leap in differential pressure flow measurement.
It uses the throttling effect produced by the V cone in the flow field to measure the flow by detecting the upstream and downstream pressure difference.
V-cone flowmeter is mainly used for flow measurement of liquid, gas and steam. V-cone flowmeter is divided into two forms: integrated and split.

If you want to divide the flow meter into three categories. I think it can be divided into volumetric flowmeters, mass flowmeters, and velocity flowmeters.

There are differences in the measurement accuracy of commonly used flowmeters, as follows.

Mass flowmeter 0.05%, positive displacement flowmeter 0.25~0.5, electromagnetic flowmeter 0.25~1.0, turbine flowmeter 0.15~0.5, vortex flowmeter 0.1.5, ultrasonic flowmeter 0.1.0 (multi-channel is better than 0.5) , Orifice plate, V cone, uniform velocity tube flowmeter 1 to 1.5, nozzle 0.10.

Both the accuracy and error of a flowmeter characterize the ability of a measuring instrument to approximate the actual true value of the measurement results. The higher the accuracy of the instrument, the closer the measured value is to the actual true value. The higher the accuracy, the smaller the error.

Therefore, the accuracy of the mass flowmeter is currently the highest.

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Sino-Inst offers over 10 V-cone flow meter products. These are differential pressure flow meters, 40% are water meters (like the Insertion Turbine Flow Meter), and 40% are water treatment (like the Annubar flow meter ).

A wide variety of V-cone flow meter options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of V-cone flow meter, located in China. The top supplying country is China (Mainland), which supply 100% of the V-cone flow meter respectively.

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. V-cone flow meter products are most popular in Domestic Market, Southeast Asia, and Mid East.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

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