MOOG 743F002B 743 Series Two-stage Mechanical Feedback Hydraulic Servo Valve

Technical Specifications

Model:743F002B

Brand:MOOG

Product type:743 Series Two-stage Mechanical Feedback (MFB) Hydraulic Servo Valve

Structure:Two-stage amplification,dry torque motor,double nozzle flapper pilot stage,with field replaceable pilot filter

Max working pressure:210bar

Rated control signal:±40mA

Coil resistance:80Ω±10% (20℃)

Working medium:Mineral hydraulic oil

Connector:Multi-pin aviation electrical connector

Function:Convert analog electric signal into proportional hydraulic flow,closed-loop governing control of steam turbine valves

Dimension:235mm122mm98mm

Weight:3.4kg

Operating temperature:-20℃ ~ +80℃

Storage temperature:-40℃ ~ +130℃

Relative humidity:10~90% non-condensing

Certification:CE

System compatibility

743F002B belongs to MOOG 743 series servo valve.It is widely used in steam turbine DEH hydraulic control system of power units to drive turbine regulating valves.It is spare part for power plant hydraulic equipment overhaul.

Function

743F002B is two-stage mechanical feedback servo valve.It adopts dry torque motor and double nozzle flapper pilot stage,equipped with field replaceable pilot filter,features high resolution and low hysteresis.Mechanical feedback spring feeds back spool position,output hydraulic flow proportional to input current for precise turbine valve adjustment.

Installation

Mount valve on standard hydraulic manifold,tighten mounting bolts to specified torque.Connect hydraulic oil pipeline and electrical control wiring.Complete oil flushing,parameter calibration and performance test before commissioning.Keep clean during handling,prevent oil contamination.

Interface

‑Multi-pin aviation electrical connector

‑Hydraulic P,T,A,B oil ports

‑Valve identification label

Feature

MOOG 743 series turbine dedicated servo valve.Typical faults:pilot filter blockage,nozzle clogging,torque motor coil damage,spool sticking,internal leakage.Inspect oil cleanliness and coil resistance before replacement.

Diagnostic

Fault phenomenon:output flow abnormal,zero drift,slow response,no action.Check oil contamination,pilot filter condition,electrical wiring,coil status and spool condition.

Product Brief

743F002B is MOOG 743 series two-stage mechanical feedback hydraulic servo valve with replaceable pilot filter,specially designed for steam turbine DEH governing control system,suitable for power plant hydraulic system maintenance and replacement.Strict oil cleanliness control is required in service.