Pneumatic control valves are to be specified for the applications listed below. State whether an A-O or A-C valve should be specified for the following manipulated variables and give reason(s): (a)...

Extracted text: Pneumatic control valves are to be specified for the applications listed below. State whether an A-O or A-C valve should be specified for the following manipulated variables and give reason(s): (a) Flow rate of reactants into a neutralization reactor. (b) Flow of effluent from a wastewater treatment holding tank into a river. (c) Flow of steam to a distillation reboiler. The valve used is shown below, - Air -Motor Stem Valve -Plug Afth