Throttling Device
Throttling device is also called a throttling flowmeter, it’s a typical differential pressure flowmeter. Throttling device is a flow device in which the fluid filled with the pipe flows through the pipe. The stream will form a local contraction at the throttling. This will increase the flow velocity and reduce the static pressure. So a differential pressure is generated before and after the throttling (or called throttling flowmeter).
It has the following distinguishing advantages:
- The throttling device has the advantages of simple structure, firmness, reliable work, stable performance, high degree, and low price. Therefore, the amount of throttling device has an advantage compared with other flow meters
- Wide range of pipe diameter
- The standard throttling device can determine its measurement degree without real flow calibration
- The working pressure can be as high as 32Mpa. Can also be used for negative pressure
- The structure of non-standard throttling device is diverse. Almost applicable to various fluid flow measurement
- Medium temperature range: -85～+650℃. Other flowmeters are not yet possible
- It is simple to use, operate, easy to master, and daily maintenance is small.
Working Principle
The throttling device artificially causes throttling in the pipeline through which the medium circulates (as shown in the figure). When the measured medium flows through the throttling device, it causes a local contraction. The stream is concentrated, the flow velocity increases, and the static pressure decreases.
Therefore, differential pressure is generated between the upstream and downstream sides of the throttle. There is a certain functional relationship between this differential pressure and the flow rate. The greater the flow, the greater the differential pressure generated. Therefore, the flow can be measured by measuring the differential pressure.
Type and composition
The throttling device consists of throttling parts (such as orifice plate, nozzle, etc.). Pressure Sensors, fastening devices (flanges, bolts, nuts, gaskets, etc.), and other accessories (pressure guiding tubes, stop Valve, etc.). It can also be equipped with front and rear measuring tubes and flanges at both ends of the straight pipe section.
Application Range
Applicable to a wide range of tested media. It can be used for almost all gas, steam and liquid flow measurement.
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The standard orifice is the simplest and most adaptable product among the throttling devices.
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The venturi meter calculates velocity by measuring the pressure head at both points before and after the narrowed throat.
