In use the primary and redundant lines are controlled in {HEAD ~ different manners} such that a v notch ball valve in the primary line is manipulated continuously to remove effluent while maintaining stable reactor conditions, and a control valve in the redundant line is manipulated intermittently as {TAIL ~ a backup} for the primary control valve 
In use the primary and redundant lines are controlled in { HEAD ~ different manners } such that a v notch ball valve in the primary line is manipulated continuously to remove effluent while maintaining stable reactor conditions , and a control valve in the redundant line is manipulated intermittently as { TAIL ~ a backup } for the primary control valve
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