These control systems include:

  • P + I + D functions to improve accuracy under varying load conditions.
  • Set points may be remotely adjusted, with the possibility of ramps between set points.


  • Very accurate and flexible.
  • Remote adjustment and read-out.
  • No limit on valve size within the limits of the valve range.
  • Excellent turndown ratio.
  • Fast operation means they respond well to rapid changes in demand.
  • Very powerful, and can cope with high differential pressures.


  • Which need accurate and consistent temperature control.
  • With variable and high flowrates, and/or variable upstream pressure.