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Industry Information
Orifice flowmeter throttling device used with differential pressure transmitter to measure liquid
2012-3-27 9:12:01

应用及其广泛,它被广泛适用于冶金、电力、煤炭、化工、石油、交通、建筑、轻纺、食品、医药、农业、环境保护及人民日常生活等国民经济各个领域。 Orifice flowmeters are widely used. They are widely used in various fields of national economy such as metallurgy, electric power, coal, chemical industry, petroleum, transportation, construction, light textile, food, medicine, agriculture, environmental protection and people's daily life.

Orifice flowmeters consist of throttling devices (standard throttling devices and special throttling devices), differential pressure transmitters, three valve groups, etc. The measurement method is based on the law of conservation of energy and the continuous flow equation. Standard throttling devices are basically suitable for measuring clean liquid, gas or vapor flow. Its main advantages are simple structure, which can ensure certain use accuracy, convenient processing, installation and replacement, and low price. The main disadvantages and disadvantages are the narrow measurement range, large permanent pressure loss, and strict requirements for straight pipe sections.
Technical requirements of standard orifice plate flowmeter
1) The center of the orifice plate is symmetrical with respect to the axis of the opening diameter d; 2) The upstream end face A of the orifice plate should be parallel to the downstream end face B and perpendicular to the axis of the opening diameter d; 3) The A and B faces of the orifice plate should be free of Visible damage; 4) The right-angled entrance edge G of the orifice opening diameter d of the orifice plate should be sharp without burrs and scratches. 5) The length e of the inner cylindrical surface of the orifice opening diameter d shall comply with: 0.005D≤e≤0.02D; 6) The thickness of the orifice plate shall comply with: e≤F≤0.005D; 7) the exit edge H of the downstream side of the orifice plate And the orifice edge of the cylindrical downstream side of the orifice opening I should be free of burrs, scratches and visible damage; 8) In the course of use, the standard orifice plate will be deformed due to the erosion of natural gas, which will increase the flow coefficient and cause measurement. error. Therefore, the material of the orifice plate is also a factor to ensure that the orifice plate works reliably and accurately. Orifice production for natural gas measurement is generally: Cr17, 1Cr18Ni9TiC and other acid-resistant steels. 9) Open the inlet and outlet valves, and the inlet and outlet valve openings must be the same. 10) Open the stainless steel three-valve group, the balance valve, and slowly open the high and low pressure valves of the orifice plate. After the fluid passes the flow meter, close the stainless steel three-valve balance valve. .


HYLG series orifice plate flowmeter is a high-range specific differential pressure flow device which is composed of a standard orifice plate and a multi-parameter differential pressure transmitter (or differential pressure transmitter, temperature transmitter and pressure transmitter). The orifice plate flow meter throttling device includes an annular chamber orifice plate, a nozzle and the like. Orifice flowmeter throttling device is used together with differential pressure transmitter to measure the flow of liquid, steam and gas. Orifice flowmeter is widely used in petroleum, chemical, metallurgy, power, light industry and other departments.
The fluid filled with the pipeline, when they flow through the throttle device in the pipeline, the flow beam will form a local contraction at the throttle of the throttle device, thereby increasing the flow velocity and low static pressure, so it is generated before and after the throttle. The pressure drop, that is, the pressure difference, the greater the flow rate of the medium flow, the greater the pressure difference generated before and after the throttle, so the orifice flowmeter can measure the flow rate of the fluid by measuring the pressure difference. This measurement method is based on the laws of energy conservation and flow continuity.
Intelligent throttling device (orifice flowmeter) is a new generation flowmeter that integrates flow, temperature and pressure detection functions and can automatically compensate for temperature and pressure. New technology, strong function, compact structure, simple operation and easy to use.
Second, characteristics ▲ orifice plate flow meter throttling device structure is easy to copy, simple, sturdy, stable and reliable performance, long service life, low price.
▲ Orifice plate calculation adopts international standards and processing. ▲ Orifice plate flowmeters have a wide range of applications. All single-phase flows can be measured, and some mixed-phase flows can also be applied.
▲ The standard throttling device can be put into use without actual flow calibration.
安装更简单,无须引压管,可直接接差压变送器和压力变送器。 ▲ Integrated orifice flowmeter is simpler to install, without the need for a pressure pipe, and can be directly connected to a differential pressure transmitter and a pressure transmitter.
Features of Intelligent Orifice Flowmeter ▲ Using imported single crystal silicon intelligent differential pressure sensor ▲ High precision and perfect self-diagnosis function
▲ The intelligent orifice plate flowmeter can simultaneously display the accumulated flow, instantaneous flow, pressure, and temperature.
▲ In addition to the online and dynamic full compensation function, the smart orifice plate flow meter also has self-diagnosis and self-setting range.
▲ Equipped with a variety of communication interfaces ▲ High stability ▲ Wide range, greater than 10: 1
技术指标▲高精度:±0.075% Technical index of intelligent orifice plate flow meter ▲ High accuracy: ± 0.075%
▲ High stability: better than 0.1% FS / year ▲ High static pressure: 40MPa
▲ No need to adjust for 5 years of continuous operation ▲ Can ignore the effects of temperature and static pressure ▲ Resistant to high overpressure