Fisher 481-16 Actuator Diaphragm

Technical Specifications

Model：481-16 Brand：Fisher Product Type: Pneumatic actuator diaphragm

Module Feature

Fisher 481-16 is elastomer reinforced diaphragm for Fisher 657 and 658 series pneumatic diaphragm actuators. It is the pressure sensing flexible membrane inside actuator. It has good resistance to instrument air, aging and fatigue. Widely used in oil,gas,chemical and power plant globe control valves.

Working principle: Convert air pressure to linear mechanical thrust Onboard components: Reinforced elastomer diaphragm

LED indicators

Not equipped

Hardware self-diagnosis

Visual inspection for crack, aging and puncture, air tightness test after assembly

Programming software

No dedicated software required

Mechanical & Structure

Mounting: Clamped between actuator upper and lower casing Protection class:IP66

Environmental

Operating temperature:-40℃ ~ +120℃ Ambient humidity:5~95% non-condensing Certification:CE Status:Fisher actuator diaphragm spare part

System compatibility

Compatible with Fisher 657,658 series pneumatic diaphragm actuators and globe control valves for industrial process control system.

Function

481-16 is actuator diaphragm manufactured by Fisher. Instrument air pressure acts on diaphragm to generate linear thrust to push valve stem, realize valve opening and closing. It is the core flexible power transmission part of diaphragm actuator. Aging or rupture will cause actuator air leakage and valve malfunction. It is standard consumable for scheduled actuator overhaul.

Installation

Follow lockout/tagout safety procedure before installation. Cut off instrument air supply and exhaust actuator pressure. Disassemble actuator casing, replace old diaphragm. Align diaphragm edge evenly and tighten bolts crosswise. Reassemble actuator and perform air tightness test and stroke calibration.

Interface

Actuator casing clamping installation, no LED indicators on 481-16.

Diagnostic

Actuator air leakage: Diaphragm crack, puncture or aging. Valve no stroke: Diaphragm rupture and cannot generate thrust. Slow valve action: Diaphragm fatigue and elasticity decreased.

Product Brief

481-16 Fisher pneumatic diaphragm actuator reinforced elastomer diaphragm,matched with Fisher 657/658 series actuator,used for industrial globe control valve scheduled overhaul,actuator consumable spare part.