MOOG 631-550A Two-stage Mechanical Feedback Hydraulic Servo Valve

Technical Specifications

Model:631-550A

Brand:MOOG

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

Structure:Two-stage amplification,dual-nozzle flapper pilot stage,mechanical feedback spring

Max working pressure:310bar

Rated control signal:±10mA

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:210mm110mm90mm

Weight:3.4kg

Operating temperature:-20℃ ~ +120℃

Storage temperature:-40℃ ~ +130℃

Relative humidity:10~90% non-condensing

Certification:CE

System compatibility

631-550A belongs to MOOG 631 series servo valve.It applies to material fatigue test bench,hydraulic vibration test rig,simulation loading equipment and precision press,widely used in high-precision closed-loop hydraulic control system.It is spare part for legacy hydraulic equipment overhaul.

Function

631-550A is two-stage mechanical feedback servo valve.It adopts polarized torque motor and double nozzle flapper pilot stage,features high resolution and low hysteresis.The feedback spring realizes spool position mechanical feedback,output hydraulic flow proportional to input current signal for precise hydraulic control.

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 631 series reliable 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 response,no action.Check oil contamination,electrical wiring,coil status and spool condition.

Product Brief

631-550A is MOOG two-stage mechanical feedback hydraulic servo valve with high precision and stable performance,used for closed-loop hydraulic control of test and simulation equipment,suitable for industrial hydraulic system maintenance and replacement.Strict oil cleanliness control is required in service.