Electric control Industrial Valves how to choose appropriate diameter size

the choice of caliber and determine the main basis valve the flow capacity of the Cv. At a time when the device in all kinds of engineering design and type selection, Cv for the regulating valve is calculated, and provide the regulator design specification. From the electric regulating valve Cv to the Industrial Valves diameter calculation method and general subject to the following steps:

1 determination of calculation flow. The existing production capacity, equipment load and the condition of the medium, decided to calculate flow rate Qmax and Qmin. The determination of 2 electric control valve pressure difference before and after. According to the selected valve flow characteristic and system characteristics of the selected S ( Drag coefficient) And determine the differential calculation. 3 Cv. According to the regulation of media to choose the appropriate formula and chart, Cmax and Cmin is obtained. 4) Selects the Cv. According to the Cmax, standard series of the products in their choice selection & gt; Cmax and with its most close to the level of C. 5) The opening of the electric control valve calculation. General requirements at the time of maximum calculation flow opening ≯ 90%, the smallest calculation flow when opening ≮ 10%. 6) Actual calculating the adjustable than electric regulator. Actual adjustable ≮ 10 general requirements.

7) The determination of seat diameter and nominal diameter. Verify right after, according to the C.

electric control valve selection is very meticulous work, not only must have the solid specialized theory knowledge, but also have rich practical experience. Is a good choice is not only beneficial to adjust the setting of PID parameters of control circuit, the modulated parameters to get better control effect, and makes the service life of the regulating valve increase greatly. Selection of regulating valve must adjust measures to local conditions, not static, constant summary and innovation in the process of practice, especially with the electromechanical integration technology, computer and the application of digital information technology, structure and function of the electric control valves for the better and more comprehensive, provides great convenience for choosing electric regulator.
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