The integration of V cone flowmeter

Products overview:
ZW series of LGVThe integration of V cone flowmeterWith V cone in the flow field generated by the throttling effect, measured by detecting the differential pressure of upstream and downstream of the flow.Compared with ordinary throttling, it changed the throttling layout, from the center hole throttle annular throttle instead.Practice shows that V cone flowmeter has high accuracy, good stability for a long time, the installation condition of limited small, wear resistance, wide measuring range, small pressure loss and suitable for the advantages of smudges.And V cone itself as the flow field of the rectifier and become a new type has unique properties of excellent flowmeter.By the V cone sensors and a combination of differential pressure transmitter.
Second, the working principle:
ZW series of LGV integration of V cone flowmeter consists of a coaxial installation in the measuring tube tip of the cone and the corresponding pressure, the measuring tube is machined, the differential pressure, pointed at both ends of the cone, the differential pressure of high pressure (positive pressure) is at the upstream fluid contraction front wall static pressure measurement, and low pressure (negative pressure) is taken from the cone pointing downstream face pressure on the center of a cone hole.
* toward the coming flow of the cone, cone and its tail is a sharp acute Angle between the edge of the mating surface makes the fluid into the low pressure area downstream before there is a transition zone of smooth.
Due to fluid near the pipe center axis, not forced to contraction and not a blockage, to change fluid flow direction, but using the new structure of V type cone throttling device realized gradually to the fluid toward the side wall of tube shrinkage, make V cone flowmeter has a series of unique advantages.The low voltage side produce high-frequency low-rising small vortex, the differential pressure and differential pressure transducer is measured is low noise signal, can make the differential pressure transmitter measured high resolution ratio, V cone flowmeter to get wide range ratio and good repeatability.
V cone flow sensor produced by the square root of the differential value is proportional to the flow of relationships:
Qv = (c. epsilon)/(1 - beta 4) 0.5 (PI / 4). D2.0.5
Among them: Qv: fluid volume flow
C: the outflow coefficient;
Epsilon: fluid expansion coefficient;
Beta: throttling ratio;
D: throttle diameter;
Δ Ρ: differential pressure value;
Rho 1: working condition of fluid density.
Applications:
ZW series of LGV integration of V cone flowmeter is a more accurate one meter,Mainly used in gas and liquid flow measurement, in measuring gas,Also widely used in gas field.In conjunction with the special intelligent instrument or conversion module, can meet the electrical, thermal, metallurgical, chemical industry, urban water supply heating, various measurement of different industries such as building air conditioning, output, etc.
Four, measurable medium:
1.gas
Gas, coke oven gas and blast furnace gas and city gas;
Natural gas, including moisture content more than 5% of the gas.
All kinds of hydrocarbon gas: alkane and olefin gas;
For various gases: hydrogen, helium, argon, oxygen, nitrogen, etc.;
Corrosive gas, wet chlorine gas, etc.;
Air: including water, air, compressed air containing dust, etc.;
Flue gas: all kinds of boiler, heating furnace flue gas emissions;
2.Steam: saturated steam and superheated steam;
3.liquid
Oil: crude oil, fuel oil, aqueous emulsified oil, diesel oil, hydraulic oil, etc.;
Water, raw water, drinking water, production water, sewage, etc.;
All kinds of aqueous solution: acid, alkali, saline solution, etc.;
Organic chemicals, methanol, ethylene glycol, xylene, etc;
4.A special fluid
+ + HC gas oil sand.
Aerated water, H2O + N2 + air;H2O + CO2, etc.
Five, the main features:
Flow meter accuracy: + / - 0.5%, plus or minus 1.0%, plus or minus 1.5% accuracy of system must be reference to application conditions and the precision of the second table.
Repeatability: better than that of plus or minus 0.1%
Wide range than: under normal circumstances of 10:1, if necessary can also be increased.
Straight pipe low requirements: flowmeter 0 ~ 3 d straight pipe before and after the 0 ~ 1 d straight pipe can guarantee the accuracy of measurement.Experiments show that V cone flowmeter can close to single or double bend in different plane bend and little impact on accuracy.
Good long term stability: the cone shape design to ensure that when fluid flows through the cone is a gradual process, no mutation, beta can keep unchanged for a long time, instrument can be use for a long time without calibration.
Signal stability: all of the differential pressure flow meter will be "fluctuations", that is to say, even if the fluid is very stable, signal produced by a throttle unit will fluctuate.For orifice, the throttling parts after the formation of the vortex is longer, the long spiral will cause a high amplitude, low frequency wave signal, the signal will cause interference to the differential manometer readings.And cone flowmeter can be formed in its downstream small vortex, cause a low-rising, high frequency wave signal.
Small pressure loss, because there is no prominent baffle, so conical three out of four * pressure loss is lower than orifice flow meter.
Mixer role: V cone flowmeter downstream vortex is generated by the short spiral, can be in the downstream mix medium, therefore, the current V cone flowmeter in as well as the work flow, but also on many occasions used as static mixer, can rapidly and fully stir well to media.
Six, the technical parameters:
1, nominal menstruation: 50 mm or less DN 1800 mm or less
2, nominal pressure: PN 40 mpa or less
3, the scope of Reynolds number: 8 x 103 Red or less 107 or less
4, precision grade: 0.5, 1.0
5, repeatability: 0.1% or less
6, former straight pipe: 1 ~ 3 d, straight pipe: after 3 ~ 5 d
7, small pressure loss, is only 1/2 ~ 1/3 of orifice plate
8 and cone trailing edge vortex is small, stable output pressure side, small fluctuation stability is good.
9, than a wide range: flow range can reach: 1:15
The flange type:
1, connection mode: flange (flat welding and butt welding);
2, size: DN15 ~ DN2000;
3, apply pressure method: socket welding, flange, screw thread;
4, pressure: 0 ~ 40 mpa;
5, temperature: - 40 ~ 850 ℃;
6, material: 304 stainless steel, 316 l stainless steel and 20 # carbon steel selection (see table).
7, application: liquid, gas, steam;
8, suitable medium: widely used in municipal, electricity, chemical industry, petroleum chemical industry, metallurgy, food processing and other industries in the flow measurement, suitable for almost all the gas and liquid medium.
Direct welding type:
1, the mode of connection: pipe welded directly to the process;
2, size: DN15 ~ DN2000;
3, apply pressure method: socket welding, flange, screw thread;
4, pressure: 0 ~ 40 mpa;
5, temperature: - 40 ~ 850 ℃;
6, material: 304 stainless steel, 316 l stainless steel and 20 # carbon steel;
7, application: pipeline, pipeline, steam pipe, high pressure pipeline process.
Seven cone of sensor and differential pressure transmitter, V V cone flowmeter:
In accordance with user requirements, with V cone sensors and differential pressure transmitter the supply of flow measuring instrument is divided into two categories:
1, V cone sensors provide only the differential signal detection part of the cone and measuring pipe (V), does not provide differential pressure transmitter, part three valve group and flow display, output signal for the differential pressure.By the users themselves.
2, V cone flowmeter consists of V cone sensor and differential pressure transmitter.Have installed points in shape and a size two structures.
Points are installed by an independent V cone of sensor and differential pressure transmitter.V taper between sensor and differential pressure transmitter of pressure pipe connection completed by users themselves.The differential pressure transmitter can form a complete set of supplies.
3, installation is a size product factory has the differential pressure transmitter, three valve group and V cone sensors connected into an organic whole, after users buy a size V cone flowmeter, don't need to join again when using pressure tube.For matching the corresponding flow integrator, pressure transmitter and temperature transmitter can form a complete set of supplies.

Eight, use the matters needing attention:
1, and the postal inspection specifications confirmation:
Play is put on the market after a full inspection, when the user types and specifications, please after receipt of the goods in a timely manner to confirm, and check whether there is damage appearance, types and specifications of engraving on the nameplate on the outside of the flowmeter, and shall confirm the receipt of the goods and packing box parts listed on the packing list whether is complete.
2, transportation and storage conditions:
On his way to prevent the transport and handling damage instrument, in the work site prior to installation, please keep this product appearance because the packing condition.
When stored in a need for a long time, please pay attention to the points:
A, in not affected by shock and vibration.
B, avoid exposure to the wind rain, storage environment in normal temperature is often wet around (25 ℃, 65% RH)
C, try to keep in this product factory packing condition for storage.
D, used a product to save, please make sure the residue within the instrument clean.
Nine, installation considerations:
Guide to transducer pressure of pipe used for the transmission process, if the pressure tube of the gas in the liquid or the gas pipe in the residue, cannot correct for pressure transmission, can produce error, therefore, equipped with guide of pressure pipe should be pay attention to:
Guide the installation of pressure pipe guide valve Angle:
Process fluid is a gas and steam, and guide valve installation position should be above the process piping, process fluid is a liquid lead valve installation position should be at the bottom of the process piping.
1, the process fluid is a gas, transmitter position should be higher than the pressure valve, liquid and steam process of a fluid, transmitter position should be lower than pressure valve.
2, high and low voltage side of the guide tube does not produce temperature difference.
3, application in measuring the steam condenser.

Ten, installation site:
Even in comparison also can work normally under harsh conditions, but for the sake of the use of safe and stable for a long time, during the installation, please pay attention to the points:
1, the installation place shock and vibration
The factory design of the V cone flowmeter is can withstａnd the shock and vibration.But should also try to install where no vibration or vibration.
2, installation site ambient temperature conditions
Please try to avoid the flow meter installed in the environment temperature change is big, if the installation location is directly thermal radiation or waste their exposure to day rain, waterproof, heat radiation and ventilation measures should be taken.
3, installation site ambient air conditions
V cone flowmeter should avoid as far as possible in the corrosive environment, if used in the corrosion environment, should have good ventilation and avoid corrosive gas or liquid into the instrument.

Eleven, selection of coding:

12 order, design notes:

When you place an order, please provide the following conditions in order to help the correct choice of the specifications of the flowmeter and coefficient.

1, pipe size: diameter x wall thickness (mm);

2, measuring medium name: medium density (kg/m3);

3, set the flow range: meter range of upper limit and lower limit (kg/h or m3 / h);

5, work pressure (Mpa);

6, work temperature: (° C);

7, such as wei in my company, please provide together: intelligent flow totalizer.especially pressure range, or pressure transmitter type, range;Temperature range, or models, range temperature transmitter.

After-sales service commitment:

1, from the date of signing of the contract, I in the way provided for products of the company offers free maintenance and maintenance service, commitment to lifelong maintenance service;

2, jiangsu wei measurement and control instrument co., LTD. Sales manager will be in regular contact with customers, understａnd the usage of products, and solve the problems of the customers to use in the process of produce, free of charge to provide technical support;

3 the man-made damage is found, the warranty period, our company is responsible for the maintenance, and the resulting maintenance fee;

4, product quality problems or are not satisfied with product, the user can choose unconditional return, wei tt&c don't charge any fees, appear quality problem, bear the freight back and forth.