Fisher 3590 Valve Positioner Manual May 2026
The Fisher 3590 series is a family of electro-pneumatic and pneumatic valve positioners designed for rotary and sliding-stem actuators. Unlike older analog positioners, the 3590 integrates high-lift cam technology and a robust feedback system. Based on a thorough review of its instruction manual (typically D103172X012), this write-up examines the critical engineering details, setup procedures, and maintenance considerations that a technician or engineer must understand.
| Step | Action | |------|--------| | 1 | Apply lowest input signal (e.g., 3 psi for direct acting). | | 2 | Using zero screw, adjust until valve just starts to move or reaches its initial position (confirmed via stem travel indicator). | | 3 | Apply highest input signal (e.g., 15 psi). | | 4 | Using span screw, adjust until valve reaches full travel (e.g., 100% stroke). | | 5 | Repeat steps 1–4 until both low and high signal points are correct without interaction. | fisher 3590 valve positioner manual
Note: Changes to span will slightly affect zero; iterate 2–3 times for fine accuracy. The Fisher 3590 series is a family of
Manual Note: For rotary valves (e.g., Fisher Vee-Ball), you must use a rotary cam and adjust the feedback arm length according to the specific angle of rotation (typically 90°). Note: Changes to span will slightly affect zero;
The manual dedicates significant pages to calibration. Below is a condensed, logical workflow.


