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Why cant a globe valve be directly installed on the front end of a wedge-shaped flowmeter? Wedge flowmeter is a flowmeter that utilizes the principle of conversion between dynamic pressure energy and static pressure energy: (throttling type) In the same closed pipeline, when the fluid flows rapidly and the velocity increases, its static pressure energy will be converted into dynamic pressure energy. So in the same closed pipeline, the higher the flow velocity, the lower the static pressure. By installing a throttling element in the fluid pathway to increase the flow rate of the fluid passing through it, a static pressure zone with different pressures will be formed before and after the throttling element. The square of the pressure difference (differential pressure) is proportional to the flow rate. By measuring the differential pressure and taking the square root, the flow rate value can be obtained. The throttling element of a wedge flowmeter is a wedge-shaped protrusion on the pipe wall, and the flow rate can be determined by measuring the pressure difference before and after the protrusion when the fluid passes through it. Due to the relationship between differential pressure and flow rate being obtained through experiments and calculations on the basis of a straight pipe section, its parameters are determined based on the fluid flow characteristics in the straight pipe. Installing elbows, tees, valves, insertion components, etc. at the front end of the flowmeter will affect the flow characteristics of the fluid, so a certain amount of straight pipe section must be left. The length of the straight pipe section of a wedge-shaped flowmeter is generally 5-20 diameter lengths, which can be found in the flowmeter manu
2. How to install a wedge flowmeter? Wedge flow sensors are typically equipped with front and rear measuring tubes, suitable for horizontal or vertical installation and use. When installing sensors on vertical pipelines, the fluid should flow from bottom to top. When conducting liquid measurements, it is important to ensure that the differential pressure transmitter can easily eliminate air bubbles to avoid causing instrument zero drift. The upstream and downstream sides of the sensor should be equipped with straight pipe sections to ensure that the inner wall of the pipeline is smooth, clean, and free of attachments. The length of the straight pipe section should refer to relevant standards to ensure measurement accuracy. When installed horizontally, the wedge differential pressure element should maintain a 90 degree angle with the centerline of the pipeline. For vertical installation, special attention should be paid to the zero adjustment of the differential pressure transmitter, as there is a slight static pressure effect between the pressure points. During the installation process, it is necessary to carefully consider the installation position and angle of the sensor to ensure the accuracy of the measurement. When installed horizontally, the centerline of the sensor should be perpendicular to the ground to avoid the influence of fluid flow direction on the results of the measurement. When installing vertically, it is necessary to ensure that the static pressure difference between the pressure points does not significantly affect the measurement results, and if necessary, zero adjustment should be carried out. After installation, it is recommended to conduct a comprehensive calibration to verify the meas『SILVER Official Website SERVICE』
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