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1, the adjustment function ①requires regulating valve moves smoothly; ② small opening adjustment performance is good; ③ select the desired flow characteristics; ④ meet the adjustable ratio; ⑤ resistance is small, flow ratio (the nominal flow control valve parameters and nominal Path ratio); ⑥ adjust the speed. 2, the amount of leakage and cut off the pressure This is an indivisible, interrelated two factors. Leakage should meet the technical requirements, and there is the reliability of the sealing surface protection measures; cut off the pressure difference (the pressure difference when the valve is closed) must be raised (unfortunately, many design institutes regulating valve calculation specification no such parameters) , So that the selected control valve has enough output force to overcome it, otherwise it will lead to the implementing agency to choose a larger or smaller. 3, anti-blocking Even if it is a clean medium, there is also the problem of clogging, which is the pipe is not clean Things caused by the media with people regulating valve caused by blocking, which is a common fault, it should consider the anti-clogging performance of the control valve. Usually the angular stroke control valve than straight stroke control valve anti-blocking performance is much better, so after the angular stroke control valve will be used more and more. 4, corrosion resistance It includes erosion-resistant, cavitation, corrosion. Mainly related to the selection of materials and control valve service life, at the same time, involves economic issues. The essence of this problem should be that the valve of choice has good corrosion resistance and is reasonably priced. If you can choose the whole PTFE valve should not be fully corrosion-resistant alloy valve; can choose the better anti-cavitation effect, simple structure of the angle high pressure regulating valve (to meet the service life of about two years), you should not choose the complex structure, Other expensive pressure control valve expensive. 5, pressure and temperature This involves the nominal pressure regulator, the working temperature of the selected. Pressure resistance, if only high pressure is not difficult, the main pressure differential assembly produces cavitation; temperature, the usual solution is below 450 ℃ is very easy, 450 ~ 600 ℃ is not difficult, but to 600 ℃ or more, Contradictions will be prominent; when the temperature at 80 ℃ when the cut-off control valve selection of soft sealing material is usually not desirable, should consider the hard seal cut off. 6, the weight and appearance of this problem is very intuitive, must be good appearance, light weight control valve by the use of manufacturers welcome. Here to change a prejudice that the control valve is a "rough boss," a little heavier or the appearance of almost nothing remarkable. Now we attach great importance to it, thus proposed control valve should be miniaturized, lightweight, instrumented features.