control valve selection guidelines regulating Industrial Valves structure selection 1. 1 from the use function that should pay attention to choose the question 1) Regulating function requirements valve moves smoothly; (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 ( The rated flow parameters of valve 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 valve is closed) Must be mentioned, It is a pity that many design institute regulator calculation specification without this parameter) , let the selected valve have enough output power 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 media regulator, with mountains, this is a common failure, so the valve stem 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 includes erosion, cavitation and corrosion resistance. Mainly involves the selection of material and the service life of the valve problem, at the same time, involved in economic problems. The essence of this problem should be selected valve has good corrosion resistance and the price is reasonable. If you can choose all the four fluorine valve should not choose the corrosion resistant alloy valve; Can choose the cavitation effect is good, simple structure Angle of high pressure valve ( Meet the service life of two years or so) , you should not choose the other high pressure valve structure complex and expensive. 5) Pressure and nominal pressure regulating valve, this work of heat-resistant temperature selected. 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. Commonly used material of working temperature, working pressure and the relationship between the nominal pressure. 6) Weight and the appearance of this problem is very intuitive, must have good appearance, light weight of valve by using manufacturers welcome. Here to change a bias, think regulator is a & other; The boss coarse & throughout; , weight or appearance almost, not a big deal. Now we attach great importance to it, thus put forward the regulator should have the feature of miniaturization, light-duty, instrumentation. 7) The function of the ten categories of regulating valve quality is 1. Type 2 comprehensive economic effect to determine valve in meet the requirements of the use function, the applicable valve a few classes, which should be comprehensive economic effect is a valve type, therefore, we believe that should at least consider the following four questions: 1) High reliability. 1) simple structure; (2) high reliability. Here need to change the past one-sided pursuit of performance, reliability mistake overlooked. 2) Long service life. 3) Easy maintenance, spare parts have a source. 4) The product price is appropriate, performance is better. 1. Optimization of 3 valve type order according to the function of regulating valve and the point of view, provide optimal regulator sequence is as follows: (1) fully functional ultra light valve & rarr; (2) butterfly valve & rarr; (3) sleeve valve & rarr; (4) single-seat valve & rarr; (5) two-seater valve & rarr; 6. Eccentric rotary valve & rarr; All landowners ball valve & rarr; End Angle valve & rarr; Pet-name ruby the 3-way valve (pos. No. & rarr; Attending the diaphragm valve. Option 2 2 actuators. A major consideration in 1 actuator selection actuator selection is the main factor: 1) reliability; (2) economy; (3) action smoothly and enough output power; (4) weight appearance; 5. Simple structure, convenient maintenance.

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