First, differential pressure Venturi flowmeter features a differential pressure Venturi flowmeter categorized as a differential pressure flowmeter is a comparison of traditional flow measurement instrumentation. Its measurement and stability are good, and its accuracy can basically meet the demand. It has certain application in the reservoir and a few water companies. The Venturi flowmeter consists of a venturi tube (savings part) and an associated differential pressure transmitter. The flow is calculated by measuring the differential pressure before and after the saving of the saving parts. The savings of this type of flow meter are almost unimproved and now it has reached a level of perfection and has been standardized. Second, the classification of venturi flowmeter: Fourth, Venturi flowmeter principle:
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Venturi flowmeter is divided into pipeline type Venturi flowmeter and piercing type Venturi flowmeter according to its equipment method. Pipeline type Venturi flowmeter can be divided into standard Venturi flowmeter (general pipeline) and rectangular Venturi The flowmeter and rectangular Venturi flowmeter is a built-in Venturi tube. It is primarily concerned with the flow measurement of large diameter, low flow velocity, and high flow rate gases in industrial enterprises. It has a common structural plan and is used in large-scale national winds. The hole laboratory conducts flow calibration. Can be widely used in petroleum, chemical, metallurgy, electricity and other professional large diameter fluid control and measurement. The piercing type Venturi flowmeter is mainly used in the field where the bore diameter is too large, the equipment straight pipeline is short or the equipment position is limited, and the demand for flow measurement accuracy is not high. The equipment has the advantages of convenient equipment debugging, no need to cut the pipe section, and low cost. Such characteristics, currently used to replace the rectangular venturi and wing wind measuring equipment, for the measurement of wind flow.
According to the manufacturing method, the venturi flowmeter is divided into the rough casting section and the shortened section, and the venturi flowmeter with the shortened machining section and the venturi flowmeter with the shortened section of the rough welding iron.
Third, the main characteristics of Venturi flowmeter:
1, the structure is simple, durable, stable function, not easy to block.
2, the pressure loss is small, save the power required for flow transmission, can be used for two-phase flow, miscible flow, low flow rate, large diameter, shaped pipe and other messy flow measurement.
3, high accuracy, good repeatability, low pressure loss, the required straight pipe is shorter.
3. Within the scope of 50-1200, no actual flow calibration is required. Beyond this scale, you can make reference plans. When higher accuracy is required, real-flow calibration can be performed.
4. The scale of the body equipment is relatively large. With regard to the large-diameter appearance, it is not convenient to transport equipment. Think about using standard orifice plates or piercing-type double venturi flowmeters.
Venturi flowmeter is also called classic Venturi tube, classical Venturi tube, used to be called Venturi tube and regulate Venturi tube. It is based on the Venturi effect developed after the conservation of the type of flow sensor, is a specification to save equipment. No actual flow calibration is required in the 50-1200mm aperture scale. Because of its high precision, low pressure loss, and no wear, it is often used as a transaction settlement type flow rate for the accurate measurement of steam, natural gas, and petrochemical type media. Its planning and production are made according to the national standard GB/T2624-93 or ISO5167, and are certified according to the national standard JJG640-94. It is used to measure the flow of a single-phase steady fluid in a closed pipe. It is often used to measure the flow of fluids such as air, natural gas, gas, and water. In the specification of saving equipment, it requires the shortest straight pipe section with the least upstream and downstream pressure, the least loss of permanent pressure, stable function, and convenient protection. Because of its accurate accounting and low energy consumption, it has been widely used in petroleum, chemical, power, and metallurgical occupations.