Flow element, also known as differential pressure flow meter, consists of a primary detection piece (flow element) and a secondary device (differential pressure transmitter and flow indicator). Flow element is the most stable and reliable of all flow meters, which has a history of more than 100 years. Its wide applicability, high reliability and accurate accuracy make it widely used in the measurement of gas, liquid and vapor.
Made in China. brand DDTOP, model LG Nozzle
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The LG type flow measurement flow element is the most widely used flow measurement instrument. It has the advantages of simple structure, easy installation, stable performance, and high accuracy. It can be used for liquid, vapor and gas flow measurement in modern industry. The LG type flow measurement flow element produced by our company adopting advanced calculation methods and precise processing methods has a wide range of varieties (in line with GB/T2624-2006, ISO5167-1-2003, BS1042-1989, American Mechanical Engineering Association standards, etc.), With complete specifications, it is widely used in petroleum, chemical, electric power, light industry, water supply, gas transmission and other fields.
Operating Principle
In the pipeline filled with single-phase continuous fluid, install a flow element (such as a nozzle). When the fluid passes through the orifice of the flow element, the vapor forms a local contraction, the flow velocity increases, the kinetic energy increases, and the static pressure decreases. There is a static pressure difference between the front and back of the flow element, that is, ΔP = P1-P2. If the area of the orifice is F, the mass flow of the fluid is qm, the volume flow is qv, and the density is ρ, according to the principle of flow continuity and Bernoulli equation can derive the relationship between pressure difference and fluid flow:
In the formula, α is the flow coefficient. It can be seen from the above relationship that if the orifice area and fluid density are constant, the flow rate is proportional to the square root of the pressure difference, that is, as long as the pressure difference is measured, the flow rate can be calculated. The flow element measures the fluid flow rate based on this principle.
Features
1.Structure is simple, easy to install, reliable to work, accuracy can meet the needs of engineering survey.
2.It has pure mechanical structure, according to the site high temperature and high pressure conditions to select appropriate structure and material. The highest pressure is 42 MPa and the highest temperature is 500℃.
3.Flow element has a long history of use, it has rich and reliable experimental data. Design and processing has been standardized. Standard orifice plate is no need to carry out the real flow calibration and maintenance.
Applications
DN50~DN600（long diameter nozzle）
0.2≤β≤0.8（long diameter nozzle）
1. Model
Table 1 Flow Element Code and Meaning
| Code | Meaning | Code | Meaning |
| M | ISA1932 Nozzle | C | Long Diameter Nozzle |
Table 2 Tap Method and Meaning
| Code | H | D |
| Meaning | Corner Ring Tap | Diameter Tap |
Table 3 Nominal Diameter Code and Meaning
| Code | 01 | 016 | 02 | 026 | 03 | 04 | 05 | 06 | 08 | 10 | ||
| DN | mm | 10 | 15 | 20 | 25 | 32 | 40 | 50 | 65 | 80 | 100 | |
| in | 1/2 | 3/4 | 1 | 1-1/4 | 1-1/2 | 2 | 2-1/2 | 3 | 4 | |||
| Code | 12 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 60 | ||
| DN | mm | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 | |
| in | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 24 | ||
| Code | 70 | 80 | 90 | 100 | 105 | 110 | 115 | 120 | 125 | 130 | ||
| DN | mm | 700 | 800 | 900 | 1000 | 1050 | 1100 | 1150 | 1200 | 1250 | 1300 | |
| in | 28 | 32 | 36 | 40 | 42 | 44 | 46 | 48 | 50 | 52 | ||
Table 4 Nominal Pressure Code and Meaning
| Code | 01 | 02 | 03 | 04 | 05 | 06 | 10 | 11 | 15 | 16 | ||
| PN | MPa | 1.6 | 2.0 | 2.5 | 4.0 | 5.0 | 6.3 | 10.0 | 11.0 | 15.0 | 16.0 | |
| Class | 150 | 300 | 600 | 900 | ||||||||
| Code | 26 | 42 | ||||||||||
| PN | MPa | 26.0 | 42.0 | |||||||||
| Class | 1500 | 2500 | ||||||||||
Table 5 Straight Pipe Section Code and Meaning
| Code | A | B | C | D | E | F | |
| Unit | Flow Element | Flow Element, Mounting Flange | Flow Element,
Mounting Flange, Upstream and downstream straight pipe section |
Flow Element,
Mounting Flange, Upstream and downstream straight pipe section, Upstream and downstream connection flange |
Flow Element,
Mounting Flange, Upstream and downstream straight pipe section, Upstream connection flange |
Flow Element,
Mounting Flange, Upstream and downstream straight pipe section, Downstream connection flange |
Welding Structure |
2. Executive Standard
2.1 Flow Element Executive Standard
| Code | Meaning | Standard Code |
| M | ISA1932 Nozzle | GB/T2624—2006（ISO5167—1—2003） |
| C | Long Diameter Nozzle | GB/T2624—2006（ISO5167—1—2003） |
For example, corner tap standard nozzle selection of DN50 CL300 is LGMH-0505A.
2.2 Flange and Gasket Executive Standard
Flange and gasket standards can be selected from HG/T20592～20614-09 (European system) or HG/T20615～20635-09 (American system) or other standards.
You can request the necessary certificates, documentation, instructions and user manuals for DDTOP LG Nozzle using the special form.
You can buy DDTOP LG Nozzle in UK or Europe at a favourable price in «DOLCHETRADE» by leaving a request on the website, by phone +441225535040 or by email dolce@dolcetrade.com. DDTOP LG Nozzle price are subject to change depending on exchange rates. We deliver instruments by transport companies in the United Kingdom and Europe.
See also: Flow meters
