What are the functions of the flowmeter?

The ultrasonic flowmeter adopts the principle of time-difference measurement: after the transmission signal of a probe passes through the pipe wall, the medium, and the other side of the pipe wall, it is received by another probe, and at the same time, the second probe also transmits the signal and is received by the first probe, due to the influence of the flow rate of the medium, there is a time difference δt between the two, and the conversion relationship between the flow rate v and the time difference δt can be obtained according to the estimation v=(C2 2L) δt, and then the flow value Q can be obtained.

Turbine flow meter.

It is the main type of velocity flowmeter, when the measured fluid flows through the turbine flowmeter sensor, under the action of the fluid, the impeller rotates under the force, and its speed is proportional to the average flow rate of the pipeline, at the same time, the blade periodically cuts the magnetic field lines generated by the electromagnet, changes the magnetic flux of the coil, according to the principle of electromagnetic induction, the pulsating potential signal will be induced in the circle, that is, the electrical pulse signal, and the frequency of the electrical pulsation signal is proportional to the flow rate of the measured fluid. For details, please refer to Beijing Connason.

Here are some of the well-known brands recognized in the flowmeter industry that are widely recognized and have a great reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

Flowmeters are divided into differential pressure flowmeters, rotameters, throttle flowmeters, fine slit flowmeters, volumetric flowmeters, electromagnetic flowmeters, ultrasonic flowmeters, etc. Classified by medium: liquid flow meter and gas flow meter.

Electromagnetic flowmeter.

When a conductive fluid flows through an electromagnetic field, the velocity of the fluid can be obtained by measuring the voltage. There are no moving parts and are not affected by fluids. The measurement of conductive liquids at full tube is very accurate. Electromagnetic flowmeters can be used to measure the flow rate of slurry fluids.

Differential pressure flowmeter.

This is the most common flow technique, including orifice plates, venturi tubes, and sonic nozzles. DP flow meters can be used to measure the flow rate of most liquids, gases, and vapors. The DP flowmeter has no moving part, is widely utilized, and is easy to apply.

But when it is blocked, it can cause pressure loss, which affects accuracy. The accuracy of the flow measurement depends on the accuracy of the pressure gauge.

Turbine flow meter.

As the fluid flows through the turbine flow meter, the fluid rotates the rotor. The rotational velocity of the rotor is coherent with the velocity of the fluid. The average flow rate of the fluid felt by the rotor is used to derive the flow rate or total amount.

Turbine flow meters accurately measure clean liquid harmonies. Like PD flow meters, turbine flow meters also create irrecoverable pressure errors and also require moving parts.

Ultrasonic flowmeter.

The propagation time method and the Doppler effect method are commonly used in ultrasonic flowmeters to measure the average velocity of a fluid. Like other velocity gauges, it is a gauge that measures volumetric flow rates. It is an obstruction-free flow meter that does not need to be plugged in if the ultrasonic transmitter is installed outside the pipeline.

It is practical for almost all liquids, encapsulates the plasma, and has a high degree of accuracy. However, the contamination of the pipes will affect the accuracy.

Volumetric Flow Meter (PD).

PD flow meters are used to measure the volumetric flow rate of liquids or gases, which introduce the fluid into the metering space and count the number of rotations. Impellers, gears, pistons, or orifice plates, etc., are used to divert fluids. The PD flow meter has a high accuracy and is one of several methods for measuring viscous liquids.

However, it also generates irrecoverable pressure errors and the need to install moving parts.

Ultrasonic flowmeter, electromagnetic flowmeter, turbine flowmeter, etc.