LG VENTURI FLOW METERS
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Dandong TOP Electronics Instrument (Group) Co., Ltd LG VENTURI FLOW METERS Summary 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 energysaving 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. Model Selection Table 1. □ Straight Pipe Section Code- Table 5 Nominal Pressure Code- Table 4 Nominal Diameter Code- Table 3 Tap Method Code- Table 2 Flow Element Code- Table 1 Serial Number ADD/ No.10 Huanghai Street, Zhenxing District, Dandong, Liaoning, China P.C. / 118008 E-MAIL / top@ddtop.com

Dandong TOP Electronics Instrument (Group) Co., Ltd Table 1 Flow Element Code and Meaning Code Classic Venturi Tube with Machined Shrinkage Section Classic Venturi Tube for Shrinking Section of Thick Welded Iron Plate Table 2 Tap Method and Meaning Code Table 3 Nominal Diameter Code and Meaning Code DN Table 4 Nominal Pressure Code and Meaning Code PN Table 5 Straight Pipe Section Code and Meaning Code Flow Meaning Element, Flow Element Mounting Flange Mounting Flange, Upstream and downstream straight pipe section Flow Element, Mounting Flange, straight pipe straight pipe straight pipe...

Dandong TOP Electronics Instrument (Group) Co., Ltd 2. Executive Standard 2.1 Flow Element Executive Standard Code Classic Venturi Tube for Machined Shrinkage Section Classic Venturi Tube for Shrinking Section of Thick Welded Iron Plate For example, DN50 CL300 flange connection tap equalizing ring venturi tube model is LGJT-7-7A 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. Order Requirements 1. When ordering flow element, please fill in the flow...

Dandong TOP Electronics Instrument (Group) Co., Ltd Allowable Pressure Loss Specification Model Nominal Diameter(DN) Nominal Diameter(DN) Outer Diameter/Inner Diameter Nominal Pressure(PN) Flange Standard Flange Inner Diameter Structure Length Tap Position Flow Element Flange Material Notes 2. Our company can provide users with the following services: 2.1 Provide a complete set of the above-mentioned various specifications of flow element. 2.2 Provide flow element calculation for users, including: 1) Knowing the aperture diameter d20 of the flow element and the meter scale flow rate, under...