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Chapter 12 explores the practical applications of feedback control in managing control valves. It addresses scenarios where the manipulated valve is activated under specific conditions when the variability is less than 4%. The chapter also emphasizes identifying failure modes to ensure safe operating conditions, such as pressure reduction and flow management. Key considerations include handling nonlinearity in flow meters, validating process conditions, and employing filtering techniques to mitigate reset windup effects through integral mode management.
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@ Control valve ( ) If v≤ 4% , the (small) manipulated valve is added.
@ Failure mode To determine the safest process conditions (reducing the pressure) after the failure • The feed to zero • The output liquid flow to maximum • The heating medium flow to zero • The vapor flow to its maximum
Input processing • Validity check • Conversion for nonlinearity i.e. flow meter and linearization of mV or mA 3. Engineering units 4. Filtering
