Pole position
Although control valve, actuator and positioner technologies develop only relatively slowly, there have been advances that offer practical, diagnostic and cost/benefit issues. Brian Tinham reports
Opening up on control valves
There are three key steps to ensuring that control valves don't cause process plant instability. Mark Perry explains the problems and their solutions
Control Revisited
Control valves, actuators and positioners aren't renowned for rapid technological development, but advances are changing the shape of best practice. Brian Tinham reports