Regulator is used to adjust in the field of industrial automation process control medium flow rate, pressure, temperature, liquid level and other process parameters. According to the control signal of the automation system, the automatic adjustment of valve opening, so as to realize the medium flow rate, pressure, temperature and liquid level of the regulation. The regulator usually by electric actuators or pneumatic actuators and valve body two parts together. Straight travel mainly through single seater and direct two-seater type two kinds, the latter has a large flow capacity, unbalanced and the characteristics of stable operation, so often especially suitable for large flow, little pressure drop and leakage. Quarter-turn basically has: V electric regulating valves, electric butterfly valve, ventilation control valve, eccentric butterfly Industrial Valves, etc. Flow capacity Cv value is one of the main parameters on the selection of regulating valve, regulating valve of flow capacity is defined as: when the control valve fully open valve pressure difference on both ends of 0. 1 mpa, fluid density of 1 g/cm3, the regulator on the number of traffic flow diameter per hour, called flow capacity, also known as the flow coefficient, expressed as a Cv, unit for t/h, Cv value of the liquid press type calculation. According to the flow capacity Cv value look-up table size, you can determine the nominal size of the regulating valve DN. In the automatic control of modern factory, the regulator plays a very important structure ', 'the production of the factory depends on the correct flow of the liquid and gas distribution and control. These controls both the exchange of energy, pressure reducing, or is a simple container loading, will need some final control elements to complete. The final control element can be thought of as the automatic control of & other; Physical & throughout; 。 In the regulator low energy level and high level necessary for the execution of flow fluid control function, the final control element to complete the necessary power amplification effect. Flow characteristic of regulating valve flow characteristic, it is on both ends of the valve differential pressure under the condition of constant, the medium flows through the regulator of the relationship between relative flow and its opening. Regulating valve the flow characteristic of linear features, such as percentage and parabolic characteristics of three. Percentage of properties such as regulating Industrial Valves, regulating valve linear characteristic, the regulator parabolic features. The meaning of three kinds of injection flow characteristic is as follows: ( 1) Such as percentage of features, Logarithmic) Percentage characteristics such as relative trip and no linear relationship between relative flow in the process of every point unit running change caused by the flow of change is proportional to the flow of this point, the percentage of the flow rate change is equal. So it has the advantage of traffic hours, changing flow is small, large flow, the flow rate change is big, is also on the different opening, has the same accuracy. （ 2) Linear features, Linear) Linear characteristic of relative stroke and the relative flow into a linear relationship. Unit trip caused by the changes in the flow rate change is constant. Large flow, the flow relative changes little, traffic hours, flow relative change is big. （ 3) Parabola changes flow according to the schedule 2 is proportional with linear and roughly equal percentage in the middle of the properties. Can be seen from the analysis of the above three kinds of characteristic, its regulation performance, is the optimal with characteristics such as percentage, its regulation stability, good regulation performance. And parabolic characteristics than the linear characteristic of regulating performance is good, can according to the requirement of the application, choose any of them a flow characteristic. （ 4) Flow coefficient Kv valve flow coefficient Kv, is an important parameter of regulating valve, its ability to reflect the regulator through the fluid, which is the capacity of regulating valve. According to the control valve flow coefficient calculation of Kv, can choose the calibre of the valve is determined. In order to correctly select the calibre of the valve, it is necessary to correctly calculate the Kv rated flow coefficient value of the regulating valve. Regulator Kv rated flow coefficient is defined as: under prescribed conditions, namely the ends of the valve pressure difference is 10 pa, fluid density of lg/cm, rated the trip through the regulating valve in m/h or t/h on the number of traffic. Regulating valve installation and maintenance is very common and is particularly important in the production of industrial control equipment, it is working properly or not is directly related to the entire unit production is normal or not. At present, with the changing of regulating valve technology, regulating valve manufacturers and form is various, function also vary, the following focuses on various types of regulating valve before installation and commissioning of the common problems should be paid attention to. 1, the incoming goods inspection regulator valve before installation of incoming goods inspection is a very important link, to confirm the regulator if it will be the arrival of the goods meet the design requirements. Each technical requirements of the regulating valve shall meet the design requirements, but should emphatically when receiving inspection to check the following several contents. 2, body/trims specifications the content mainly includes: valve type, valve type, nominal diameter, the seat size, form, flow characteristics, valve core leakage level, body material, valve core material, the seat material, CV value, the flange size and sealing surface on a standard scale, etc. , as long as find it contains the same content determination of conformity with design to the design and approval. 3, actuators are part of the content mainly check the actuator model, type, form, spring range, gas supply pressure, etc.
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