Answer Posted / sam.r

control valve is a final controlling element, to implement
the manipulated variable to regulate the controlled variable
in the process.

there are two types in control valves they are
1)Inherent characteristics
a)quick opening
b)linear
c)equal percentage
in this the the pressure difference is determined by the
valve alone
2)Effective characteristics.
in this type the control valve posses the characteristics
when installed in the field.

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