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Flow control valves come in all shapes sizes and designs Their basic function however is the same to control flow of air Flow control valves for hydraulic systems liquids under pressure are of the same basic design A typical example of a flow control valve is the simple water faucet installed in homes

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data and identifies uncertain regions A set of charts is in

1977 03 14 nbsp 0183 32 example This method requires a single chart for each packing type and size It provides the highest possible accuracy as it interpolates measured Kister s book Distillation Design McGraw Hill

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The Ziegler–Nichols method is too aggressive for many industrial control systems For example for a proportional controller the method specifies a GM of just 6 dB compared with the 12 dB in the P controller tuned earlier in this chapter Figure 6 5 In general the gains from Ziegler–Nichols will be higher than from the methods presented here

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