Why can a throttling flowmeter only measure large and medium flow rates and not small flow rates?

『Intercepting flow meter』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)

1. What are the types of throttling flow meters? What are the pressure measurement methods of throttling flow meters? According to the different throttling devices, throttling flow meters can be divided into the following four main types: standard orifice plate flowmeter: using a standard orifice plate as a throttling device, it can measure the flow of various fluids such as steam, liquid, and natural gas. According to the different shapes of the orifice plate, it can be further subdivided. Standard nozzle flowmeter: composed of a standard nozzle and a differential pressure transmitter, capable of measuring the flow rate of fluids. Standard nozzles come in different structural shapes. Venturi flowmeter: composed of an inlet section, a contraction section, a throat, and a diffusion section, it has the characteristics of wide measurement range, high accuracy, and easy installation. Bent tube flowmeter: Utilizing the bending characteristics of the pipeline itself to achieve flow measurement, without the need for additional throttling or flow blocking components, it has the advantages of simple structure and convenient installation. The pressure measurement methods of throttling flow meters are divided into the following five types: corner connection pressure measurement: the most widely used one, suitable for flow measurement of gases, liquids, and vapors. Flange pressure measurement: suitable for flow measurement of most fluids. Radial pressure measurement: Choose according to specific application scenarios. Theoretical pressure measurement: Choose according to specific application scenarios. Pipe connection pressure: Choose according to specific application scenarios. The selection of different pressure measurement methods needs to be determined based on the specific application scenarios and fluid characteristics of the Qidu family to ensure the measurement accuracy and reliability of the flowmeter.

2. Differential pressure signal Δ P of throttling flowmeter

Because when fluid flows in a pipeline, according to the law of conservation of energy, the pressure P/density ρ+velocity v ²/2=constant (note the square in the theorem), and the (volume) flow rate in the pipeline=flow velocity v × rock area A of the pipeline. Therefore, whether the non permeable opening theory is a differential pressure flowmeter that uses the principle of fluid energy conversion or the principle of fluid dynamic pressure, the signal and flow rate cannot be separated from a liquid open square relationship. As for the square root calculation in the measurement system, please refer to the following link: http://hi.baidu.com/fengxiaosa/blog/item/88a6ccb54a1fa9db37d3cacd.html

3. What are the types of throttling flow meters?

Abstract: A throttling flow meter refers to a flow meter that has a throttling device in the circulation pipeline and converts the fluid flow rate into a differential pressure signal through the throttling device, thereby displaying the flow rate.

『SILVER Official Website SERVICE』