Process control system

Details Process control system Process control system

F - Mech Eng,Light,Heat,Weapons

01

D

341/38

F01D 17/00 (2006.01)

Patent

CA 1184626

Abstract of the Disclosure A process control system including a method and apparatus for preventing a controller from overdriving a stuck valve. Control is based on the output of the con- troller if the valve is not stuck. However, if the valve becomes stuck, the variable high or low limit takes effect until such time as the valve becomes unstuck. This prevents a situation from being created in which sufficient force is placed on the control valve to cause the control valve to go to a completely open or completely shut position when the control valve does become unstuck thus avoiding a dangerous situation.

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