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Standard nozzle flowmeter

23标准喷嘴流量计.jpg
  • 23标准喷嘴流量计.jpg
ZW series of LGPStandard nozzle flowmeterHas a long history background, all kinds of test data is co…

Description:

Products overview:

ZW series of LGPStandard nozzle flowmeterHas a long history background, all kinds of test data is complete.Simple structure, no moving parts, stable and reliable long-term use, rich experience in design and manufacture and application.Doesn't need a high degree of standardization, solid flow calibration.Standard orifice has reliable experimental data and improve the international and national standards.In foreign countries and has its inherent in the huge domestic market, users are familiar with, data;Follow the international standard calculation and processing, use agile and convenient;The most widely used in domestic flow measurement is still the differential pressure type flowmeter.itHigh temperature and high pressure resistance, impact resistance, long service life, large measuring range and accuracy of measurement, suitable for high power plant high temperature and high pressure steam heat-supply pipeline flow of the fluid flow measurement.

Second, the working principle:
ZW series of LGPStandard is to adopt the principle of the nozzle flowmeter throttle flow sensor.It on the basis of the long neck nozzle USES the pressure (pressure) throat from special ways, make the flow sensor not only has the advantages of traditional long neck nozzle, at the same time also have outflow coefficient of stability, repeatability of higher unique advantages.Is a kind of high precision flow sensor.Flow calculation formula:

Type: - mass flow respectively (㎏ / s) and the volume flow (m3 / s);

- flow coefficient;

- expansiveness coefficient;

-- the throttle hole diameter, m;

- diameter ratio,

- pipe diameter, m;

- the flow volume density, ㎏ / m;

-- differential pressure, Pa;

The nozzle by measuring the pressure difference to measure the size of the fluid flow.This kind of measurement method based on the energy conservation law and the law of flow continuity as a benchmark.Fluid filled with pipes, when they flow through the pipe of the throttle device, a beam will local contraction at the throttling of the throttle device, so that the flow velocity increases, the static pressure is low, so the throttling parts before and after the pressure drop is produced, the pressure difference, the greater the flow of medium flow, on the throttling the greater the pressure difference before and after.
Applications:
ZW series of LGPStandard nozzle flowmeter with all sorts of differential pressure transmitter, can measure all kinds of fluid flow.With adjusting the flow rate can also be adjusted.Widely used in petroleum, chemical, metallurgical, textile, water conservancy, electricity and other departments.
1, liquid: hot and cold water, chemical liquid, light body oil.
2, gas, blast furnace gas, coke oven gas, all kinds of single-component multicomponent gas.
3, superheated steam and saturated steam.
4, compressed air.
5, natural gas, the torch gas, liquefied petroleum gas.
Four, the main features:
1, simple structure, convenient installation.
2, the nozzle is smaller than the pressure loss of orifice plate, straight pipe length is short.
3, no real flow calibration, stable performance.
4, resistant to high temperature and high pressure, impact resistance.
5, corrosion resistant performance is better than orifice, long service life.
6, high precision, good repeatability and stable flow coefficient.
7, circular structure design can measure all kinds of liquid, gas, steam medium as well as all kinds of dirt.
8, overall forging processing technology, the cost is higher.
Five, the technical parameters:
1, the nominal diameter: 20 mm or less DN 630 mm or less;
2, nominal pressure: PN acuities were 32 mpa;
3, working temperature: - 50 ℃ or less t 550 ℃ or less;
4, Reynolds number range: 0.30 beta 0.44 or less, or less 70000 ReD 107 or less or less;
0.44 beta 0.8 or less, or less 20000 ReD 107 or less or less;
5, throat diameter ratio: 0.30 beta 0.80 or less or less;
6, precision: 0.5, 1.0, 1.5, 2.0;
7, the reference standard: GB/T2624-2006, JJG640-94;
8, connection mode: flange, welding.

Six, orifice plate and nozzle are two different types of differential pressure flowmeter:
1. The nozzle
Advantages: standard nozzle has a long history, there are a large number of all kinds of test data, the nozzle flow meter has simple structure and firm, no moving parts, stable and reliable long-term use, rich experience in design and manufacture and application, high degree of standardization, can need not to flow calibration.Standard nozzle has reliable experimental data and improve the international and national standards.Authentic measurement data, can be used as a trade settlement measurement table.
Disadvantages: manufacturing complex, the unit price is higher.
2. The orifice plate
Orifice meter advantages: high cost performance.Standard orifice plate has a long history, the international and national standards and verification regulations and a large number of experimental data, without real flow calibration.Authentic measurement data, can be used as a trade settlement measurement table.
Faults: orifice acute Angle edge wear, dirt and other factors will affect measuring accuracy.Verification cycle short 6 to 12 months.
Seven, the structure form:
Nozzle by A plane perpendicular to the axis of the entrance section, circular arc form surface B and C part and shrinkage of the entrance of the cylindrical throat E and protection of the edge of to prevent damage to the groove of F, pressure from its ways upstream pressure mouth Angle of using access, downstream take pressure can be set up by the pressure of Angle joint, also can be set up in the far downstream.The total length of the nozzle
A, when 0.30 beta 2/3 or less or less, the nozzle length = 0.6041 d.
B, when two-thirds beta 0.80 or less or less, the nozzle length = {0.4041 + (0.75 / beta 0.25 beta 2-0.5225) 0.5} d;
C, ISA 1932 nozzle upstream face by perpendicular to the axis plane and profile for the two arcs of a circular, cylindrical throat and groove for the identified contraction of the nozzle.ISA1932 nozzle way of selecting pressure Angle only pressure a pick up.
Eight, notable matters of installation:
1, can be horizontal, vertical or inclined installation, should guarantee the tube filled with liquid.
2, throttle device before and after the straight pipe should be straight, not visible to the naked eye bends, should be "round" at the same time, the inner surface should be clean, without potholes and sediment;
3 and the request of straight section length and throttling device installation should be in conformity with the relevant provisions of the GB/T26224-93.
4, lead pressure pipeline installation should comply with the standards stipulated by the regulations.

Nine, scope of application and application:

Throttling a name

Apply pipe

(DN mm)

Apply to diameter ratioB(d/D)

Application characteristics

Uncertainty of outflow coefficientEc%

Design criteria

Angle of access standard orifice plate

Ring chamber type

50-500

50-500

0.2-0.75

0.2-0.75

Apply to clean mediumGDUnder the condition of structure is suitable for high temperature and high pressure flow rate measurement

0.6-0.75%

ISO5167

GB/T2624-93

The clamping ring type

50-500

0.2-0.75

Easy to remove dirt, and can be used to clean fluid flow measurement

Oblique hole type

450-1000(3000)

0.2-0.75

Flange pressure standard orifice plate

50-1000

0.2-0.75

Easy to remove dirt, and are suitable for all kinds of media

0.6-0.75%

ISO5167

GB/T2624-93

Span with standard orifice plate

50-1000

0.2-0.75

Angle access standard pressure nozzle

(ISA1932Nozzle)

50-500

0.3-0.8

Small pressure loss, long life, especially suitable for steam flow measurement

0.8-1.2%

ISO5167

GB/T2624-93

The length to diameter nozzle

50-630

0.2-0.8

Small pressure loss of long service life,LGPType of length to diameter nozzle components for high parameters of water and steam flow measurement

2.0%

ISO5167

GB/T2624-93

Classic text hill

The tube

Mechanical processing

type

100-800

0.2-0.8

The pressure loss is small, straight pipe required less than orifice, nozzle

1.0%

ISO5167

GB/T2624-93

Soldering iron plate type

200-1200(2000)

0.4-0.7

1.5%

Venturi nozzle

65-500

0.316-0.77

Same as above

1.2-1.75%

ISO5167

GB/T2624-93

A quarterRound hole plate

25-150

0.245-0.6

Suitable for low Reynolds number

2.0-2.5%

DIN BS

Conical inlet orifice

25-250

0.1-0.316

Same as above

2.0%

BS

Segmental orifice

50-1500

0.32-0.8

Apply to the smudges, there are air bubbles or containing solid particles flow measurement.

1.5%

DIN

The eccentric orifice plate

100-1000

0.46-0.84

1-2%

ASME

Small hole plate

12.5-40

0.2-0.75

Applicable to small pipe flow measurement

0.75%

ASME

Lens type orifice

12.5-150

0.2-0.75

Suitable for high pressure temperature small pipe flow measurement

0.6-0.75%

ISO5167ASME

Ten, selection of code:

model

said Ming

ZW-LG

The throttle device (wei measurement and control)


Code name

According to the structure characteristics of the two basic categories


K

The standard orifice plate


P

Standard nozzle


Code name

Nominal pressure (105Pa)


2.5

2.5


10

10


16

16


25

25


64

64


100

100


200

200


Code name

CAL(mm)


15~1200

15~1200mm


Code name

According to its structure form of segmentation


H

The standard orifice plate(Ring chamber)


Y

The standard orifice plate(The flange)


K

The standard orifice plate(drilling)


I

ISA 1932The nozzle


L

The length to diameter nozzle


W

Venturi nozzle


G

Classic venturi tube


S

Double orifice


Q

Segmental orifice


Z

Conical inlet orifice


R

A quarterRound hole plate


P

The eccentric orifice plate


N

As a whole(Hidden within)Orifice plate


X

Wedge orifice


T

Out of place in the above special throttling device


Code name

medium


1

liquid


2

gas


3

steam


4

High temperature liquid


Code name

Compensation in the form of


N

Without pressure and temperature compensation


P

With pressure compensation output


T

With temperature compensation output


Q

With compensation output pressure and temperature


Code name

Differential pressure transmitter range scope


0

Micro differential pressure range


1

Low differential pressure range


2

The differential pressure range


3

Elevation difference pressure range


Code name

Whether or not to bring a live show


W

The throttle device sensors


X

Intelligent throttling device

11 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.



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