Fisher 3582G Pneumatic Valve Positioner

Technical Specifications

Model：3582G Brand：Fisher Product Type: Single acting force balance pneumatic valve positioner

Module Feature

Fisher 3582G is force-balance pneumatic positioner for sliding-stem diaphragm actuated control valves. It accepts pneumatic input signal and modulates supply air pressure sent to actuator, keeps valve stem position proportional to input signal. Zero and span are adjustable, supports split range application. It can switch between direct and reverse action on site. Internal bleed air protects internal parts from dust and moisture. Widely used in oil,gas,chemical and power plant control valve pneumatic loops.

Working principle: Force balance between feedback lever and nozzle-flapper, amplifies small pneumatic signal to drive actuator Onboard components: Nozzle flapper assembly, pneumatic relay, feedback lever, zero/span adjustment screw, aluminum housing, gauge ports

LED indicators

Not equipped

Hardware self-diagnosis

Visual inspection, nozzle flapper blockage check, air tightness test, zero/span calibration, valve stroke linearity test

Programming software

No dedicated software required

Pneumatic Parameters

Input signal:3-15psi or 6-30psi Supply air:20~150psi clean dry instrument air Output: Pneumatic pressure to diaphragm actuator

Mechanical & Structure

Mounting: Direct mount on control valve yoke Protection class:IP66

Environmental

Operating temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non-condensing Certification:ATEX,CE Status:Fisher 3582 series pneumatic positioner

System compatibility

Matched with Fisher 1052,657,658 series pneumatic diaphragm actuators and globe sliding-stem control valves.

Function

3582G is pneumatic positioner manufactured by Fisher. It compares valve actual stem position with pneumatic setpoint signal. If deviation exists, nozzle-flapper changes back pressure, pneumatic relay amplifies signal to adjust actuator air chamber pressure. It eliminates valve stem friction and process load disturbance to improve positioning accuracy. Dirty nozzle or relay wear will cause oscillation, calibration failure and slow response.

Installation

Follow lockout/tagout safety procedure before installation. Mount 3582G on valve yoke and connect feedback linkage to valve stem. Hook up instrument air supply, input signal tubing and actuator output tubing. Adjust zero and span, select direct/reverse action, perform air tightness and full stroke test.

Interface

Pneumatic supply port, signal input port, actuator output port, mechanical feedback linkage connected to valve stem, no LED indicators on 3582G.

Diagnostic

Valve oscillation: Dirty nozzle or unstable relay performance. Position drift: Feedback linkage loose or incorrect zero/span. Slow valve response: Relay internal blockage or diaphragm fatigue. Calibration failure: Nozzle-flapper gap misadjustment.

Product Brief

3582G Fisher force balance single-acting pneumatic valve positioner,converts pneumatic setpoint signal to actuator air pressure for sliding-stem globe valve,for oil gas chemical plant control valve accurate positioning,pure pneumatic field positioner.