Control valve flow characteristics, to maintain the pressure difference between the two sides of the valve under the premise that the material flow through the threaded liquid-controlled check valve relative flow and it opens the middle of the correlation. The flow characteristics of the universal control valve are linear, equal percentage, double curve three.
Equal percentage characteristics, the flow rate and opening degree graph is a majority curve graph. This type of characteristic is the same at each point of the process, the percent change in stroke arrangement and the percent change in flow rate. The characteristic is that when the opening degree is clocked, the flow rate change is small, and when the opening degree is too large, the flow rate change is large. In contrast to differential pressure control valve regulation, it has the same precision of adjustment at different opening degrees.
Comparison of linear characteristics stroke arrangement and relative flow rate into a parallel line correlation. The change in flow rate caused by a change in the sector stroke arrangement is not changed. When the flow rate is too large, the relative value of flow rate changes little, and when the flow rate bellows, the relative value of flow rate changes much.
The flow rate of hyperbolic characteristic changes proportionally according to the two sides of the stroke arrangement, and roughly has the positive middle characteristic of linear and equal percentage characteristic.
Only on the adjustment performance of the regulating valve, the equal percentage characteristic is superior, its smooth adjustment, good adjustment performance. The hyperbolic characteristic is better than the linear characteristic of the regulation performance. However, the processing target characteristics to be regulated if the characteristics of the regulating valve with each other (cumulative, offset), it is likely to be beneficial or bad with the regulatory performance of the system software, so it is necessary to choose the flow characteristics of the level solenoid control valve in accordance with the different needs of the application site.
In general, the application of linear characteristic valve when adjusting the level meter, adjusting the flow rate application and other percent more.
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