MOOG 773-558 773 Series Two-stage Mechanical Feedback Hydraulic Servo Valve

Technical Specifications

Model:773-558

Brand:MOOG

Product type:773 Series Two-stage Mechanical Feedback (MFB) Hydraulic Servo Valve

Structure:Two-stage amplification,polarized torque motor,double nozzle flapper pilot stage

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 position,force and pressure control

Dimension:192mm105mm89mm

Weight:2.8kg

Operating temperature:-20℃ ~ +120℃

Storage temperature:-40℃ ~ +130℃

Relative humidity:10~90% non-condensing

Certification:CE

System compatibility

773-558 belongs to MOOG 773 series servo valve.It applies to dynamic fatigue test bench,gas turbine control and heavy load simulation equipment,widely used in high-precision closed-loop hydraulic control system.It is spare part for legacy hydraulic equipment overhaul.

Function

773-558 is two-stage mechanical feedback servo valve.It adopts polarized torque motor and double nozzle flapper pilot stage,features high dynamic response,high resolution and low hysteresis.Mechanical feedback spring realizes spool position feedback,output hydraulic flow proportional to input current signal for accurate hydraulic regulation.

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 773 series high performance industrial servo valve.Typical faults:nozzle blockage,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 dynamic response,no action.Check oil contamination,electrical wiring,coil status and spool condition.

Product Brief

773-558 is MOOG 773 series two-stage mechanical feedback hydraulic servo valve with robust construction and excellent dynamic performance,applied to turbine and dynamic hydraulic test equipment,suitable for industrial hydraulic system maintenance and replacement.Strict oil cleanliness control is required in service.