V-cone flow sensorIt is an instrument that uses throttling effect to measure flow rate. Compared with other throttling fluids, it has changed the throttling layout from traditional central orifice throttling to annular throttling, that is, the V-cone sensor uses a streamlined cone suspended at the center of the pipeline to gradually contract the fluid to the inner wall of the pipeline, thus making it have characteristics such as self rectification, self-cleaning, and self-protection.

The V-cone flowmeter is a differential pressure flowmeter. When the measured medium flows through the V-cone in the measuring tube, a local contraction flow state is formed before and after the cone, which accelerates the fluid velocity and reduces the static pressure, resulting in a certain differential pressure before and after the V-cone. The faster the flow rate, the greater the differential pressure generated. By measuring the differential pressure value, the fluid flow rate can be calculated.

The V-cone flowmeter【Technical Features

01. High accuracy: ± 0.5% [When customizing a V-cone with β<0.55, the accuracy can reach ± 0.1%]

02. Good repeatability: 0.1%

03. Stable output differential pressure: The negative pressure end at the tail of the V-cone has small fluctuations

04. Low measurement limit: output differential pressure small value of 25Pa

05. Wide range ratio: up to 10:1-50:1

06. Low pressure loss: only 1/3 to 1/2 of the orifice plate, similar to a Venturi tube and vortex street

07. Equipped with self rectification function: capable of measuring mixed phase flow

08. With self-cleaning function: no debris retention, suitable for measuring dirty flow

09Install a short straight pipe section, upstream 0-3D, downstream 0-1D

10. Long term stability is good: the fluid is gradually contracted to the inner wall of the pipeline, resulting in minimal wear on the V-cone

11. Measurable high temperature fluid:<600 ℃, other flow meters are difficult to measure high temperature fluids

The V-cone flowmeter【Applicable measurement medium

The V-cone flowmeter has self rectification, self-cleaning, and self-protection characteristics, which can be used to measure the following fluids:

Gas

★ Gas: Coke oven gas, blast furnace gas, city gas, semi water gas

★ Natural gas: Large caliber, low pressure, low flow rate, including natural gas with a moisture content of over 5%

★ Various hydrocarbon gases: alkanes, alkenes, and other gases

★ Various gases produced by gas pressure stations: oxygen CO2、 Argon, nitrogen, acetylene, etc.

★ Corrosive gases: wet chlorine gas, wet chloride gas, etc.

★ Gas produced in the air conditioning room: compressed air, including compressed air containing water, dust, and oil droplets.

Common gases in boiler rooms: blower air volume, induced draft fan air volume, flue gas, etc.

Steam

★ Saturated steam

★ Overheated steam;

[Liquid]

★ Oils: crude oil, fuel oil, heavy oil, hydrated emulsified oil, diesel, kerosene, etc.

★ Water: raw water, drinking water, tap water, industrial production water, etc.

★ Organic solvents: alcohol, methanol, ethylene glycol, xylene, etc.

Other special fluids

Correct selectionV-cone flowmeter requiredprocess parameters

1. Fluid name

2. DN pipe diameter (mm)

3. Flow range and unit (including size flow, normal flow, and scale flow)

4. Work pressure, working temperature

5. Fluid density (kg/m3) and viscosity (mpa. s) under working conditions

6. Gas volume percentage of mixed gas

7. Differential pressure: upper limit of differential pressure, allowable large pressure loss

The V-cone flowmeter【Correct installation method

（1） Connection method

1. Flange connection type: universal type

2. Flange clamping connection type: suitable for small diameters

3. Direct welding type

4. Insertion type: suitable for large caliber

（2） Requirements for upstream and downstream straight pipelines: generally 0-3D upstream and 0-1D downstream

The V-cone flowmeter【Correct operation and use

Proper selection, installation, and operation are the three important steps for using a V-cone flowmeter effectively. If the operation is not used properly, there may be significant measurement errors in mild cases, and damage to the instrument in severe cases.

（1） ThePosition and direction of the pressure port on the V-cone sensor

1When measuring liquidsTo prevent bubbles from entering the pressure tube,Pressure portdirectionIt should be 45 degrees below the horizontal lineWithin the position, the positive and negative pressure ports are on the same horizontal plane.

2When measuring gasesTo prevent liquid from entering the pressure conduit,Pressure portdirectionShould be 45 degrees off the horizontal lineWithin the position, the positive and negative pressure ports are on the same horizontal plane.

3When measuring steamIn order to ensure a constant condensate level in the condenser and consistency in the height of the condensate level on the positive and negative pressure pipe sections,Positive and negativePressure portbe inandSymmetrical pipelinepositionThe positive and negative pressure ports are on the same horizontal plane. 、、

（3） TheRinse the pressure pipeline

Before connecting the differential pressure transmitter,Rinse the pressure pipe firstTo prevent rust or dirt from entering the differential pressure transmitter.

（4） TheExhaust or discharge

When the measured fluid is a general liquid or gas, the bubbles or liquid in the pressure pipe and differential pressure transmitter should be discharged.

The specific operation is as follows: After flushing the pressure pipe, connect the differential pressure transmitter. At this time, first open the balance valve in the three valve group, and then slowly open the positive pressure valve to allow the measured fluid to slowly enter the differential pressure transmitter. Drain the air (or liquid) from the exhaust (or discharge) valve hole of the differential pressure transmitter. Close the exhaust needle valve, close the balance valve, open the negative pressure valve, and the instrument will be put into normal operation.

（5） TheWhen measuring steam flow rate

After flushing the pressure pipe, first open valve 1 to drain the condensate water from the condenser and pressure pipe through flushing valve 2. Then open the pressure valve and balance valve on the three valve group, close valve 2, and inject condensate water into one condenser until there is condensate overflow from the other condenser. When there are no more bubbles in the exhaust valve, close the exhaust needle valve, close the balance valve, and put the instrument into normal operation.

Attention: The liquid level in both condensers should be at the same horizontal plane, so that there will be no additional height difference.

（6） TheCorrectly add isolation fluid

When the tested liquid is corrosive and an isolator must be installed, the differential pressure transmitter and isolator should be filled with isolation liquid before operation. The specific operation method is as follows:

After flushing the pressure pipe, isolator, etc., connect the differential pressure transmitter. First, close valve 1, then open the pressure valve and balance valve on the three valve group, as well as the two exhaust needle valves on the upper end of the differential pressure transmitter. Then open the middle plug of the isolator, slowly inject isolation liquid from one isolator until the other isolator is filled with isolation liquid. Tighten the middle plug, open the balance valve on the isolator, close the balance valve on the three valve group, and slowly open valve 1. After the measured medium fills the pressure pipe and isolator, close the balance valve on the isolator, open the negative pressure pressure pressure valve, and the flowmeter can be put into operation.