The main features of the wedge flowmeter, the type and principle of the flowmeter

1. Good repeatability, high accuracy, calibrated wedge flowmeter, accuracy up to level.

2. It has self-cleaning ability and no stagnant area.

3. Wear resistance, long life and high reliability.

4. The permanent pressure loss is smaller than that of the orifice plate.

5. One-piece structure, on-site installation without installing impulse pipeline, directly with the pipeline for threaded or flange connection. The construction is time-saving and labor-saving, and the maintenance is convenient.

Other characteristics: 1) Suitable for measuring slurry, coal tar asphalt, coal water suspension and other high viscosity fluids;

2) At very low pipeline Reynolds numbers (even as low as re=500), the square root relationship between the flow rate and the differential pressure can still be maintained. The minimum Reynolds number of the orifice flowmeter is much larger than that of the wedge flowmeter;

3) The separately calibrated wedge flowmeter has a high measurement accuracy (up to 3% for the uncalibrated wedge flowmeter;

4) Simple structure, easy to install, use and maintain;

5) It can measure corrosive medium, because the differential pressure measurement is a diaphragm type double flange differential pressure transmitter, the corrosive medium can not enter the impulse pipe and differential pressure transmitter, so as long as the wedge-shaped throttle is processed with corrosion-resistant materials, the instrument can be used to measure the corrosive medium.

The basic structure of the wedge flowmeter.

The structure of the wedge-shaped flowmeter is simple, and its structure (see Fig. 2) is between the round orifice plate, the nozzle and the 1 4 round orifice plate, and it also has good adaptability when taking into account the advantages of the above several forms of flowmeter.

Main features 1) The dirty fluid is easy to pass, and the dirt is not easy to adhere and settle, which improves the accuracy of measurement, prolongs the use and maintenance cycle, and is suitable for metallurgy, chemical industry, environmental protection and other media measurement.

2) The requirements for the sharpness of the orifice plate inlet are improved, and the measurement accuracy is improved.

3) It is suitable for high viscosity media and has a wide range of applications.

4) The range ratio is wide, usually up to more than 10 1; The measurement accuracy is high, up to (.

5) The pressure loss is smaller than that of the orifice plate.

Wedge-shaped orifice plates, the angle is generally 60° 90°. If the angle is 0°, it becomes a circular perforated plate. The smaller the angle, the greater the static pressure difference and the corresponding increase in pressure loss.

Due to the inverted triangular shape of the wedge-shaped orifice plate, this shape has a diversion effect and allows for smooth transitions when the fluid flows. Wedge-shaped orifice plates produce less pressure loss than orifice plates. Comparison of the pressure loss generated by a wedge-shaped orifice plate with a sharp orifice plate.

6) The wedge-shaped orifice plate has the advantages of a round orifice plate.

When the fluid contains impurities or solids, it is easy to flow through the lower part of the wedge-shaped orifice plate and will not be deposited around the orifice plate, that is, the wedge-shaped orifice plate has a self-cleaning effect.

7) Suitable for low Reynolds number RD flow measurement.

Standard orifice plates, venturis, etc., should not be measured at low Reynolds numbers. The flow coefficient of a standard orifice plate is usually stable at a Reynolds number above 4000, and at a low Reynolds number, the flow coefficient changes with the Reynolds number. When the Reynolds number is less than 1800, the basic square root relationship between the flow rate and the differential pressure deviates, which obviously has a big impact on the measurement accuracy.

The wedge-shaped orifice plate is a V-shaped throttling element, with good linear flow coefficient, smooth curve of nozzle inlet, no stagnant area, and little influence of Reynolds number on it. When the Reynolds number is smaller.

At 500, the accuracy and flow coefficient of the wedge flowmeter do not change much; The Reynolds number is measured between 400 and 10000 with an error of less than 3%, and the Reynolds number of the wedge-shaped orifice plate is a curve of the flow coefficient.

Porcelain Xi instrumentation.

A flow meter is a tool used to measure the velocity of a liquid or gas, and according to its measurement principle, the common types of flow meters include the following:

1.Differential Pressure Meter (Pitot Tube): The flow rate is calculated by measuring the pressure difference formed by the fluid as it flows through the pipe.

2.Peak flowmeter: Measure the height of the ripple generated by the fluid world bureau when it flows through the pipeline to calculate the flow, and according to the different measurement signals, it is divided into two types: pressure type peak flow meter and differential pressure type peak flow meter.

3.Vortex flowmeter: Uses the vortex frequency generated by a fluid as it passes over a specific shape object in a pipe to measure the amount of flow.

4.Inductive Flowmeters and Electromagnetic Flowmeters: The flow rate is calculated by capturing the flow motion of a fluid using induced electromotive force or magnetic field.

5.Ultrasonic flow meter: The ultrasonic sensor is used to measure the flow rate of the fluid through the change in the movement state of the fluid flow in the pipeline.

6.Thermal Flow Macrometer: A sensor is used to calculate the flow rate by measuring the temperature change of the fluid in or through the pipe.

The above are 6 common types of flow meters, and they all have different measuring principles. Choosing the right flowmeter needs to combine the actual application scenarios and measurement requirements to select the appropriate flowmeter for measurement. At the same time, different types of flowmeters have different measurement accuracy, service life, and quality, so they need to be considered comprehensively according to the actual situation when choosing.

Flowmeter is an instrument used to measure fluid flow, which is widely used in chemical, petroleum, water treatment, food, medicine and other fields. Depending on the measuring principle, flow meters can be divided into several types.

1.Mechanical Flow Meter: A mechanical flow meter is an instrument that measures flow through a mechanical structure.

Common mechanical flowmeters include turbine flowmeters, gear flowmeters, piston flowmeters, etc. The principle of these flow meters is to calculate the flow rate by measuring the rotation or movement of a fluid through a mechanical structure.

2.Electromagnetic Flow Meter: An electromagnetic flow meter is an instrument that calculates the flow rate by measuring the electromagnetic induction of a liquid in a magnetic field.

The principle of the electric acre limb magnetic flowmeter is to measure the flow rate of the liquid by generating electromagnetic induction when the liquid flows through the electromagnetic field.

3.Gravimetric Flow Meter: A gravimetric flow meter is an instrument that calculates the flow rate by measuring the mass of a fluid. The principle of a gravimetric flow meter is to calculate the flow rate by measuring the change in the mass of the fluid as it passes through the pipe.

4.Ultrasonic Flow Meter: An ultrasonic flow meter is an instrument that calculates the flow rate by measuring the speed at which ultrasonic waves propagate through a fluid. The principle of an ultrasonic flow meter is to calculate the flow rate by emitting ultrasonic waves and measuring the time it takes for the ultrasonic waves to travel through the fluid.

5.Thermal Flow Meter: A thermal flow meter is an instrument that calculates flow by measuring the change in temperature as a fluid passes through a pipe. The principle of a thermal flow meter is to calculate the flow rate by heating or cooling the fluid in a pipe and measuring the change in fluid temperature.

In short, different types of flow meters have different measurement principles and application ranges, and choosing the right flow meter can improve the measurement accuracy and efficiency.

According to the structural principle of the flowmeter, it is classified into: volumetric flowmeter, differential pressure flowmeter, float flowmeter, turbine flowmeter, electromagnetic flowmeter, vortex flowmeter with acacia in the fluid oscillation flowmeter, mass flowmeter and plug-in flowmeter, and probe flowmeter.

Working principle and application of commonly used flow meter:

1. Differential pressure flowmeter.

A differential pressure flowmeter is an instrument that calculates the flow rate based on the differential pressure generated by the flow test piece installed in the pipeline, the known fluid conditions, and the combined size of the test piece and the pipeline.

Application: The differential pressure flowmeter has a wide range of applications, and is used in various objects in the flow measurement of closed pipelines, such as fluids: single-phase, mixed-phase, clean, dirty, viscous flow, etc.; Work:

Normal pressure, high pressure, vacuum, normal temperature, high temperature, low temperature, etc.; Pipe diameter: from a few millimeters to several meters; Flow: subsonic, sonic speed, pulsating flow, etc.

Its use in various industrial sectors accounts for about 1 4 1 3 of the total consumption of flow meters.

2. Rotameter.

Float flowmeter, also known as rotameter, is a kind of variable area flowmeter, in a vertical cone tube that expands from the bottom to the top, the gravity type of the float with circular cross-section is borne by the liquid power, so that the float can rise and fall freely in the cone tube.

Application: The float flowmeter is a type of flowmeter with a wide range of applications second only to the differential pressure flowmeter, especially in small and micro flow.

3. Volumetric flowmeter.

Volumetric flowmeter, also known as constant displacement flowmeter, referred to as PD flowmeter, is a class of accuracy in the flow meter, which uses a mechanical measuring element to continuously divide the fluid into a single known volume part, and measures the total fluid volume according to the number of times the volume part of the fluid is filled and discharged repeatedly in the measuring chamber.

Application: Volumetric flowmeter, differential pressure flowmeter, and float flowmeter are listed as three types of flowmeters, which are often used to measure the total amount of expensive media (oil, natural gas, etc.).

4. Turbine flowmeter.

Turbine flowmeter is the main type of velocity flowmeter, which uses a multi-blade rotor (turbine) to sense the average flow velocity of the fluid, and derives the flow rate or total amount of slag. Generally, it is composed of two parts: a sensor and a display instrument, and it can also be made into a whole.

Applications: Turbine flow meters are widely used to measure petroleum, organic liquids, inorganic fluids, liquefied gases, natural gases, and cryogenic fluids.

1. Orifice flowmeter

Working principle: the fluid fills the pipeline, and when it flows through the throttling device in the pipeline, the flow beam will shrink locally, so that the flow rate increases, and the static pressure is low, so the pressure drop occurs before and after the throttle, that is, the pressure difference, the larger the flow rate of the medium, the greater the pressure difference before and after the throttle, so the orifice flowmeter can measure the size of the fluid flow by measuring the pressure difference. This measurement method is based on the law of energy conservation and the law of flow continuity.

2. Electromagnetic flowmeter

Working principle: Based on Faraday's law of electromagnetic induction. In an electromagnetic flowmeter, the conductive medium in the measuring tube is equivalent to the conductive metal rod in the Faraday test, and the two electromagnetic coils at the upper and lower ends produce a constant magnetic magnetism, which often generates an induced voltage when a conductive medium flows through.

Two electrodes inside the pipe measure the induced voltage generated. The measuring pipe is electromagnetically isolated from the fluid and the measuring electrode by means of a non-conductive lining (rubber, Teflon, etc.).

3. Venturi flowmeter

Working principle: When the fluid passes through the flowmeter, a certain pressure difference will be generated between the inlet and outlet of the flowmeter. The rotating part of the flowmeter (referred to as the rotor) rotates under this pressure difference and discharges the flowing body from the inlet to the outlet.

In this process, the fluid fills the metering space of the flow meter again and again, and then is continuously sent to the outlet. Under the condition of a given flowmeter, the volume of this metering space is determined, and the cumulative value of the volume of fluid passing through the flowmeter can be obtained as long as the number of rotations of the rotor is measured.

4. Volumetric flowmeter

Working principle: When the fluid passes through the flowmeter, a certain pressure difference will be generated between the inlet and outlet of the flowmeter. The rotating part of the flow meter, or rotor for short, rotates under this pressure difference and discharges the fluid from the inlet to the outlet.

In this process, the fluid fills the metering space of the flow meter again and again, and then is continuously sent to the outlet. Under the condition of a given flowmeter, the volume of this metering space is determined, and the cumulative value of the volume of fluid passing through the flowmeter can be obtained as long as the number of rotations of the rotor is measured.

5. Waist wheel flowmeter

Working principle: When there is fluid passing through the flowmeter, under the action of the differential pressure of the fluid at the inlet and outlet of the flowmeter. The two waist wheels will rotate in the positive direction of the bridge.

The liquid in the metering chamber is constantly flowing in and out, and the fluid flow can be calculated only by knowing the volume of the limb metering chamber and the number of rotations of the waist wheel.

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 Fanchen, 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 noise facilities, the quality and reputation of the valve brand directly affects 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.