The term "optimum operating characteristic curve" of a regulating valve as used herein means that the valve has a constant amplification factor over the entire range of flow changes under specific operating conditions. In this case, it is envisaged that the other components of the system are also linear, and the best work of the regulator can be achieved for the entire range of signal changes. In fact, these requirements can only be encountered in very rare circumstances. In most cases, this requirement can not be achieved except that the magnification factor takes a specific range of values. When the flow rate of automatic regulation system given as a constant, regulating valve amplification factor change is not a big problem. Because there is a fixed operating point in the case, always able to achieve the best adjustment. In the case of a change of the system setpoint, which changes the given operating point, the parameters of the regulator must be readjusted in order to regain the automatic flow control system. In the case of changing the automatic setting of flow control system (such as cascade adjustment, tracking adjustment, etc.), the best condition of the system can not be achieved. Because the operating point changes over the entire range, changes in the amplification factor can cause system oscillations. According to the above situation, in the specified working conditions, to choose the most suitable regulator valve characteristic curve, it is necessary to use the curve to ensure the smallest change in the amplification factor. There are several factors to consider in this regard: 1) Adjustment of fixed or variable set point #! 2) Is there an extractor 3) Parameter ¢ =? Pr100 /? P 4) Changes, will result in changes in parameter ¢ 5) medium density in these factors, the liquid density changes on the control valve characteristics is secondary, but for compressible media, especially in special flow conditions, the change in density The effect of regulating valve characteristics is important.
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