4763 type electrical valve positioner and 4765 type pneumatic valve positioner are important accessories for pneumatic control valve, receiving electric or pneumatic control signal output from control system or controller, and assisting pneumatic actuator to adjust valve position and realize accurate positioning according to pre-set relationship.
The Fisher 4763 (electrical) and 4765 (pneumatic) valve positioners are compact devices that receive a standard 4‑20 mA or 0.2‑1 bar control signal and output a proportional pneumatic signal to accurately position control valves. They operate on a force‑balance principle using a nozzle‑flapper mechanism and support both conventional and split‑range control.
Key features include low maintenance, adjustable proportional/gain, reversible action, low air consumption, and optional explosion‑proof versions. The positioners can be mounted on IEC 60534‑6 compliant cast‑iron or rod‑type valve brackets (e.g., Samson 240 series) and are available with optional pressure gauges, stainless‑steel housings, and special oxygen‑compatible models. This manual is written in Chinese.
| Travel range (electrical) | 7.5 – 60 mm |
|---|---|
| Input signal (electrical) | 4 – 20 mA |
| Input signal (pneumatic) | 0.2 – 1 bar (3 – 15 psi) |
| Maximum output pressure | 0 – 6 bar |
| Air supply range | 1.4 – 6 bar (20 – 90 psi) |
| Weight | ≈1.2 kg (electrical) / ≈1.1 kg (pneumatic) |
| Housing material | Die‑cast aluminum with stainless‑steel components |
The 4763 electrical positioner accepts a 4 – 20 mA current signal (both explosion‑proof and non‑explosion versions).
It can be fixed to a cast‑iron bracket or a rod‑type bracket of a control valve, such as the Samson 240 series, using the appropriate mounting hardware.