Pilot-Operated Proportional DC Valve Series D*1FSThe D*1FS pilot-operated proportional valve series provides flow rate control. An additional spool position feedback leads the hysteresis to a minimum. The D*1FS is suited for ambitious standard applications with controlling position and velocity, particularly with regard to functions on identic machines, which need only to be adjusted once. In combination with the digital power amplifier PWDXXA-40*, the valve parameters can be saved, changed and duplicated.