Advances in control valves, valve actuators and positioners are changing the shape
of industrial automation and control for plant engineers.
Examples include: a digital valve controller (electronic positioner) with automated
diagnostics; and a wireless plug-in for accessing valve maintenance data even on
plants running with older 420mA control systems. Then there are: new packings and
seals, to reduce fugitive emissions; improved valve trims, for plant noise reduction
and increased valve life; and valve controllers with contactless feedback, cutting
out mechanical actuator linkages and, again, improving maintenance-free control
valve life expectancy.
Plant Engineer's coverage of valves, actuators and positioners includes even a lowly
butterfly valve now turned from shut off valve into rotary control valve with ball
valve or globe valve performance.