Fisher 3590 Valve Positioner Manual May 2026

The Fisher Type 3590 series (including S and ST variants) consists of electro-pneumatic valve positioners that are now classified as by Emerson. They were designed to convert a DC input signal (typically 4–20 mA) into a proportional pneumatic output pressure to precisely position a control valve stem. Technical Specifications

A supplemental instruction manual for Types 3590, S, and ST is available on Scribd . fisher 3590 valve positioner manual