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Throttling device is in full pipeline of fluid flowing through the pipeline in a flow device, beam will place throttling formed local contraction, so as to increase the velocity, static pressure decreased, and the throttling element before and after produced a static pressure difference (or throttle flowmeter).
Throttle flowmeter is a typical differential pressure flowmeter. The industrial production for measurement of gas, liquid and steam flow of the most commonly used a flow meter. According to the survey, (70 - 80)% is throttling flowmeter flowmeter used in steel mills, oil refineries and other industrial production system. In the field of industrial production, throttle flowmeters also accounts for the flow
The throttle flowmeter is so widely used, mainly because it has two outstanding advantages:
The structure has the advantages of simple structure, convenient installation, reliable operation, low cost, and a certain degree of accuracy, and can meet the requirements of engineering measurement.
II a long history of use, there is abundant, reliable experimental data, design and processing have been standardized. As long as according to the standard design and processing of the orifice flowmeter, do not need the actual calibration, also can flow in known uncertainty range
