调节阀选型指南（Guide to selection of control valves）.docVIP

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调节阀选型指南（Guide to selection of control valves）.doc

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调节阀选型指南（Guide to selection of control valves） Valve selection guide 1 valve structure type selection 1.1 from use function selection valve should pay attention to the problem 1) Regulation The requirements of the valve is smooth; the small opening regulation; the flow characteristics needed to meet the selected; adjustable ratio; the small resistance, large flow ratio (rated flow parameters and the valve nominal diameter ratio); the speed regulating. 2) leakage and the pressure off This is one of the two factors are indivisible and interrelated. Leakage should meet the technical requirements, and protection measures of the reliability of the sealing surface; cut off the pressure (differential pressure valve is closed) must be put out (unfortunately many Valve Design Institute of calculating this parameter specifications), so the selected valve has sufficient output power to overcome it, otherwise it will lead to the large or small actuator. 3) anti blocking Even clean medium, there are congestion problems, this is not what is in the pipeline clean medium with valve, resulting in blocking card, this is a common fault, it should consider the performance of anti blocking valve. Usually the angle adjustment of the valve stroke type of stroke than a straight type regulating valve anti blocking performance is much better, so after the rotary type valve will be used more and more. 4) resistance It includes erosion, cavitation and corrosion. The main issues related to the selection of valve materials, and the use of life at the same time, related to economic issues. The essence of this issue should be selected by the valve has good corrosion resistance and reasonable price. If you can choose all PTFE valve should not choose the corrosion resistant alloy valve; can choose anti cavitation effect, simple structure of the high-pressure valve angle (about two years to meet life), you should not choose other high pressure valve structure is complex and expensive. 5) and the high