1, smooth regulating function (1) requires the regulator action; (2) small open degree of good regulation performance; 3. Choose the required flow characteristic; (4) meet the adjustable ratio; 5. Small resistance, flow than the big ( Regulator rated flow parameters and the ratio of the nominal diameter) ; 6. Adjust speed. 2, leakage and differential pressure of the cut off this is inseparable, two factors are linked to each other. Leakage should meet the technological requirements, and the reliability of the sealing surface protection measures; Cut off the pressure difference ( The differential pressure Industrial Valves is closed) Must be mentioned, It is a pity that many design institute regulator calculation specification without this parameter) , make the output of the selected the regulator have enough force to overcome it, otherwise it will cause the executing agency to choose big or small. 3, prevent even clean medium, congestion problems, that is not clean the pipe are medium with one regulator in mountains, this is a common failure, so the regulator to collect performance should be considered. Usually angular travel class regulator than straight travel class held in regulating valve performance is much better, so the Angle after stroke regulator use will be more and more of a class. 4, corrosion resistant, it including the erosion, cavitation and corrosion resistance. Mainly involves the selection of materials and the regulator of the service life of the problem, at the same time, involved in economic problems. The essence of this problem should be selected Industrial Valves has good corrosion resistance and the price is reasonable. If you can choose all the four fluorine valve should not be selected all the corrosion resistant alloy regulator; Can choose the cavitation effect is good, simple structure Angle and pressure regulator ( Meet the service life of two years or so) , you should not choose other high voltage regulator structure complex and expensive. 5, compression and heat resistance the nominal pressure regulating Industrial Valves, select the working temperature. High pressure side, if only the pressure is not difficult, mainly is the differential assembly produce cavitation; Aspects of heat-resistant, usually solve below 450 ℃ is very easy, and it is also easy to 450 ~ 600 ℃, but to above 600 ℃, the contradiction is prominent; When the temperature at 80 ℃ of cut class regulator choose soft sealing material is usually not desirable, hard seal cutting should be considered. 6, weight and appearance of this problem is very intuitive, must have good appearance, light weight regulator by using manufacturers welcome. Here to change a bias, think that the regulator was a 'eldest brother', a bit heavy or appearance almost nothing. Now we attach great importance to it, thus put forward the regulator should have the feature of miniaturization, light-duty, instrumentation.
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