Electric flow characteristic of regulating valve directly affect the quality of system control and stability, so you need to choose correctly.

electric control Industrial Valves flow characteristic points ideal flow characteristic and the work flow characteristic. General factory flow characteristic is provided by the ideal flow characteristic, and practical applications need is work flow characteristic. Because of the pressure drop ratio less than 1 S, convex on flow characteristic for the job. Therefore, when choosing the regulator flow characteristic, should consider to choose work flow characteristic. Then, according to the practical application of ideal flow characteristic. In the ideal flow characteristic is commonly used in the production of linear, such as percentage and quick opening characteristics. And quick opening feature is mainly used for on-off control and program control, so the choice of regulator flow characteristic is usually refers to how to choose the ideal flow characteristic such as linear and percentage.

in practical use, the valve is always in the process piping system installation, before and after the valve pressure difference is with the resistance of pipeline system is changing. So, choose the regulating valve of flow characteristic, not only should based on features of process, also should consider piping of combined system.

( 1) According to process characteristics, select the valve working flow characteristic. Conventional controller of the control law is linear, the controller parameter setting after hope to be able to adapt to a certain scope of work, do not need to change often. This requires that the generalized object is linear, namely, in case of load, Industrial Valves pressure change or set point, before the characteristics of generalized object basic remain unchanged. Therefore, from the point of view of the automatic control system, for the selecting principle of control valve operating characteristics is to make the generalized object with linear features, namely in the generalized object, in addition to regulating valve features (the rest Transmitter features, process feature) For linear, should choose the linear flow characteristic of regulating valve ( The Kv is constant) ; If transmitter features is linear, and process characteristics of amplification coefficient w is reduced with the increase of the manipulated variables, the dampers should be chosen and percentage of work flow characteristic. In a word, when the generalized object ( In addition to regulating valve) With nonlinear characteristics, the regulator should be able to overcome its nonlinear effect and make the generalized object close to linear features.

( 2) According to the situation of piping, starting from the work flow characteristic, deduce the ideal flow characteristic. Regulator is always at the scene of the production facilities used together, so inevitably there are piping resistance, make the work flow characteristics of regulating valve and the ideal flow characteristic there exist certain differences. When choosing the regulator characteristic, therefore, should also be combined with process piping of consideration. According to the process piping after case, determine the pressure drop than the S value, can from the working flow characteristic of the selected, determine the ideal flow characteristic.

key words: electric flow characteristic of regulating valve, electric control valve flow how to choose
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