Today's valves can control not only the flow, but also the rate, the volume, the pressure or the direction of liquids, gases, slurries or dry materials through a pipeline, chute or similar passageway. They can turn on and turn off, regulate, modulate or isolate.

Smart valve positioners are microprocessor-based current-to pneumatic Valve positioners. They receive a DC current signal from control devices and control the openings of valves. In addition to this basic function, some of them have communication capabilities, an automatic configuration program, and self-diagnostics functions that increase productivity and efficiency of plant operations.

I/P & P/I Converters convert a current signal to a pneumatic signal so a DCS, PLC, or PC can control a valve or actuator; or convert pneumatic signals to current signals so remote pneumatic devices can interface with electronic instruments and computer-based monitoring systems.