... to move a control valve to a specified position so that a process meets specific parameters (flow, pressure, temperature). Fisher® positioners ... ,DVC6020LCFD ,DVC6020SCFDDVC6030FCFD,DVC6030LCFD, DVC6030SCFDDVC6010F-SCAD,DVC6020F-SCAD ,DVC6030F-SCAD, adjustable work positioner