Fisher A3464PAO Actuator Diaphragm Assembly

Technical Specifications

Model：A3464PAO Brand：Fisher Product Type: Pneumatic actuator reinforced diaphragm assembly

Module Feature

Fisher A3464PAO is high-performance reinforced diaphragm assembly for Fisher 657/658 series spring-diaphragm pneumatic actuators. Composite fiber reinforced elastomer material provides good flexibility, tensile strength and anti-fatigue property under cyclic stroke movement. It forms pressure sensing chamber inside actuator, converts instrument air pressure into linear thrust. Widely used in oil,gas,chemical and power plant globe control valve actuators.

Working principle: Convert air pressure difference into linear mechanical thrust for valve stroke movement Onboard components: Reinforced diaphragm membrane, retaining plates, fastening hardware, sealing gaskets

LED indicators

Not equipped

Hardware self-diagnosis

Visual inspection, diaphragm crack & delamination inspection, air tightness test after assembly, actuator stroke test

Programming software

No dedicated software required

Mechanical & Structure

Mounting: Installed between upper and lower actuator 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 and 658 series pneumatic diaphragm actuators, matched with globe control valve and FIELDVUE positioner.

Function

A3464PAO is core diaphragm assembly manufactured by Fisher. When instrument air pressure changes, the diaphragm generates linear thrust to push valve stem and adjust valve opening. It is the key elastic component to realize pneumatic force conversion. Diaphragm aging, crack or rupture will cause actuator thrust loss and air leakage. It is critical consumable spare for actuator maintenance and overhaul.

Installation

Follow lockout/tagout safety procedure before installation. Cut off instrument air supply and release residual air pressure. Disassemble actuator casing, replace old diaphragm assembly. Align diaphragm and retaining plates, fasten casing bolts crosswise. Reassemble actuator and perform air tightness test and full stroke calibration.

Interface

Sandwich mounted between actuator upper and lower housing, bolt fastened, no LED indicators on A3464PAO.

Diagnostic

Actuator insufficient thrust: Diaphragm fatigue, crack or delamination. Continuous air leakage: Diaphragm rupture or sealing edge damage. Unstable valve stroke: Diaphragm deformation and uneven force bearing.

Product Brief

A3464PAO Fisher reinforced actuator diaphragm assembly,converts instrument air pressure to linear thrust for 657/658 pneumatic actuator,for industrial control valve actuator overhaul replacement,actuator core elastic spare part.