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1. Types of flow meters
Detailed analysis of flow meter types Flow meters are mainly divided into various types based on their working principles and applicable media, including differential pressure flow meters, rotor flow meters, throttling flow meters, volumetric flow meters, electromagnetic flow meters, ultrasonic flow air tightness meters, and turbine flow meters. They each have unique measurement methods and applicable ranges. Firstly, differential pressure flow meters are the most common, using devices such as orifice plates, Venturi tubes, or sonic nozzles to measure the flow rates of liquids, gases, and vapors. Its principle is based on the pressure difference generated when the fluid passes through the orifice plate. Rotary flow meters maintain a constant differential pressure between the upper and lower parts of the rotor by changing the flow area of the fluid, and belong to variable flow area constant differential pressure flow meters, such as float flow meters. It is suitable for measuring the flow rate of fluids. The throttling flowmeter measures fluid flow rate through a throttling device and converts it into a differential pressure signal, which is then displayed by a differential pressure gauge. It is suitable for various types of fluids. Volumetric flow meters, such as PD flow meters, calculate flow velocity by measuring the volume of fluid entering the measuring space. They are commonly used for measuring liquid and gas flow rates and are implemented through impellers, gears, and other methods. Electric positive magnetic flowmeter is particularly suitable for measuring the velocity of conductive fluids. Its working principle is based on the voltage signal generated by the motion of the fluid
2. What is a throttling device? What does a throttling device include?
Concept: A throttling device is a flow device in which a fluid filled with a pipeline flows through the pipeline. The flow beam will locally contract at the throttling point, causing an increase in flow velocity and a decrease in static pressure, resulting in a static pressure difference before and after the throttling element, also known as a throttling flowmeter.
. Content: As the most important branch of the flow meter, the throttling device is divided into two categories: standard throttling devices and non-standard throttling devices. The standard throttling devices include: standard orifice plate, long neck nozzle, classic Venturi tube, and Venturi sock destruction nozzle; Non standard throttling devices include: annular orifice plate, quarter round nozzle, quarter round orifice plate, conical inlet orifice plate, circular orifice plate, eccentric orifice plate, double orifice plate, low-pressure loss flow tube, rectangular Venturi tube, wedge-shaped flowmeter, built-in orifice plate, limiting orifice plate, etc.3. Experimental principle and calculation formula of Venturi flowmeter
Venturi flowmeter is a throttling flow sensor based on the Venturi ef
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