AOLG series throttling device
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- Technical specifications
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- AOLG series throttling device
1、 Overview and Working Principle
When the fluid filled in the pipeline flows through the throttling device inside the pipeline, the flow velocity will form a local contraction at the throttling element of the throttling device, resulting in an increase in flow velocity and a decrease in static pressure. Therefore, a pressure drop, or pressure difference, is generated before and after the throttling element. The larger the flow rate of the medium, the greater the pressure difference generated before and after the throttling element. Therefore, the magnitude of fluid flow can be measured by measuring the pressure difference. This measurement method is based on the laws of energy conservation and flow continuity. However, the magnitude of pressure difference is not only determined by the flow rate, but also related to many other factors. For example, when the type of throttling device or the physical properties of the flowing medium in the pipeline, such as density and viscosity, are different, the pressure difference generated at the same flow rate is also different.
The throttling device is a differential pressure generating device for measuring flow rate, which can be used in conjunction with various differential Pressure gauges or transmitters to measure the flow rate of various fluids in pipelines. The throttling device includes annular orifice plates, nozzles, classical Venturi tubes, etc.
The throttling device is used in conjunction with differential pressure transmitters to measure the flow rates of liquids, vapors, and gases. It is widely used in industries such as petroleum, chemical, metallurgical, power, and light industry.
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2、 Main technical characteristics
1. Corner joint pressure standard orifice plate, suitable for pipe diameters ranging from 50mm to 1000mm and above. The range of Reynolds number Red is 5 × 103-107. The diameter ratio is β (ranging from 0.22 to 0.80).
Recommended Reynolds number Red min for corner joint pressure standard orifice plate.
β Red min β Red min β Red min 0.22 5.00×103 0.525 2.13×104 0.625 6.27×104 0.250 8.00×103 0.450 2.49×104 0.650 7.16×104 0.275 9.00×103 0.475 2.87×104 0.675 8.21×104 0.300 1.30×104 0.500 3.29×104 0.700 9.48×104 0.325 1.70×104 0.525 3.75×104 0.725 1.11×105 0.350 1.90×104 0.550 4.27×104 0.750 1.32×105 0.375 2.00×104 0.575 4.85×104 0.775 1.59×105 0.400 2.00×104 0.600 5.51×104 0.800 1.98×105 When the pressure standard orifice plate with corner joint is used above the Reynolds number listed in the table above, the change in flow coefficient caused by flow rate variation shall not exceed 0.5% compared to the actual value.
2. Corner pressure standard nozzle: suitable for pipe diameters between 50mm and 500mm, Reynolds number Red range between 2 × 104-2 × 106, and diameter ratio β (within the range of 0.32 to 0.80)
Recommended Reynolds number Red min for corner joint pressure standard nozzle
β Red min β Red min β Red min 0.320 4.05×104 0.500 4.94×104 0.675 4.66×104 0.350 3.93×104 0.525 5.22×104 0.700 3.42×104 0.375 3.95×104 0.550 5.49×104 0.725 2.00×104 0.400 4.04×104 0.575 5.69×104 0.750 2.00×105 0.425 4.19×104 0.600 5.78×104 0.775 2.97×105 0.450 4.40×104 0.625 5.69×104 0.800 5.19×105 0.475 4.66×104 0.650 5.35×104
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