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1. Principle of orifice flowmeter
The principle of orifice flowmeter 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 orifice flow meter throttling device includes a ring chamber orifice plate, nozzle, etc. The throttling device of the orifice plate flowmeter in China 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, metallurgy, power, and light industry. When the fluid filled in the pipeline flows through the throttling device inside the pipeline, the flow beam 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, orifice flow meters can measure the size of fluid flow by measuring the virtual pressure difference. This measurement method is based on the laws of energy conservation and flow continuity. Www.hnybc. com
2. Schematic Electromechanical 2022- Pressure Collection Method of Orifice Flow Meter
Schematic Electromechanical 2022- Pressure Collection Method of Orifice Flow Meter: Orifice flow meter is a commonly used flow measurement instrument, and its pressure collection method is the key to ensuring measurement accuracy. The pressure measurement meth
1. Corner pressure measurement includes drilling pressure measurement and ring chamber pressure measurement. This method is beneficial for shortening straight pipe sections and improving measurement accuracy. Drilling pressure measurement: Features: Suitable for pipe diameters of DN400-DN3000. Pressure requirements: The distance between the axis of the upstream and downstream pressure tapping holes and the upstream and downstream end faces of the orifice plate should be equal to 1/2 of the diameter of the pressure tapping hole. The diameter of the pressure tapping hole should be 4-10mm, and the diameters of the pressure tapping holes on the upstream and downstream sides should be equal. The axis of the pressure tapping hole should intersect perpendicularly with the axis of the pipeline. Diagram: Ring chamber pressure measurement: Features: Suitable for pipe diameters of DN50-DN400. Pressure tapping method: The pressure tapping is carried out through the ring chamber structure to ensure the uniformity and stability of the tapping hole. Diagram:
2. Characteristics of flange pressure tapping: It has the characteristics of easy processing, easy installation and cleaning, but the accuracy is lower than that of corner joint pressure tapping, suitable for pipe diameters of DN50-DN1000. Pressure requirements: The distance between the axis of the pressure tapping holes on the upstream and downstream sides and the end faces on the upstream and downstream sides should comply with the spe
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