DDTOP LG Venturi Flow Meters

Description of DDTOP LG Venturi

LG type venturi standard flow element has a long history and it is a widely used flow measuring instrument, with high accuracy, stable performance, low pressure loss (generally between 5% to 20% of the differential pressure value), easy to maintain, especially in the energy-saving work condition, it has the advantages of accurate measurement and reduced energy consumption, and has broad prospects in use.

Operating Principle

In the pipeline filled with single-phase continuous fluid, install a flow element (such as a venturi). 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.

 Technical specifications of DDTOP LG Venturi

• Nominal diameter：DN50~DN250（classic venturi tube through machining shrinkage section）

DN300~DN1200（crude welded shrinkage section of iron plate）

• Nominal pressure：0~42.0MPa
• Aperture ratio：4≤β≤0.75（classic venturi tube through machining shrinkage section）

0.4≤β≤0.7（crude welded shrinkage section of iron plate）

• Range ratio：1：10
• Accuracy：±1%
• Temperature：-196℃≤T≤+650℃

 How to buy DDTOP LG Venturi

1.  Model

Table 1 Flow Element Code and Meaning

Table 2 Tap Method and Meaning

Table 3 Nominal Diameter Code and Meaning

Table 4 Nominal Pressure Code and Meaning

Table 5 Straight Pipe Section Code and Meaning

2. Executive Standard

2.1 Flow Element Executive Standard

For example, DN50 CL300 flange connection tap equalizing ring venturi tube model is LGJT-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