Nakakita NS737S-D Valve Positioner

Feature & Principle

It is a pure pneumatic valve positioner made by Nakakita Seisakusho. It receives pneumatic signal from control system, compares signal pressure with valve stroke feedback, and adjusts output air pressure to drive pneumatic actuator for accurate valve positioning. It does not need electrical power, strong anti-vibration and anti-humidity performance, suitable for harsh marine environment, supports zero and span mechanical calibration.

Specifications

Model: NS737S-D Brand: Nakakita Seisakusho Input signal: 0.2~1.0 kgf/cm² Supply air pressure: 4.0 kgf/cm² Output pressure: 0.2~1.0 kgf/cm² Structure: All pneumatic mechanical type Housing material: Aluminum alloy Application: Marine boiler, fuel oil, steam control Protection class: IP54 Certification: Marine type approval

Components & Diagnostics

Pilot relay, feedback lever mechanism, range spring, zero adjustment screw, pressure gauge assembly, air port connector, aluminum housing. Common faults: positioning offset, air leakage, feedback stuck, zero drift, no output pressure.

Product Brief

Nakakita NS737S-D pneumatic valve positioner, marine automation spare widely used for ship boiler and offshore platform control valve overhaul and replacement.