Fisher 3590 Valve Positioner Manual Now

The Fisher 3590 is a . It receives a 3–15 psig (0.2–1.0 bar) or split-range input signal and delivers an output pressure to the actuator to precisely position the valve stem. It is commonly used with sliding-stem valves and can be adapted for rotary actuators.

The manual recommends cleaning the primary orifice periodically. Use a small wire or cleaning tool to clear debris without enlarging the hole, as this can change the gain of the positioner. Safety Warnings fisher 3590 valve positioner manual

Many confuse the older Fisher 3582 with the 3590. From the manual’s specifications: The Fisher 3590 is a

The manual dedicates a full section to range spring selection. For split-ranging, the spring must be physically changed—not just recalibrated. Using the wrong spring (e.g., a 3–15 psi spring for a 6–30 psi range) will result in zero hysteresis but incorrect stroke, which cannot be corrected by the zero/span adjustments alone. From the manual’s specifications: The manual dedicates a