MOOG 72A-560 Two-stage Mechanical Feedback Hydraulic Servo Valve

Technical Specifications

Model:72A-560

Brand:MOOG

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

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

Max working pressure:350bar

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:245mm128mm105mm

Weight:3.7kg

Operating temperature:-20℃ ~ +80℃

Storage temperature:-40℃ ~ +130℃

Relative humidity:10~90% non-condensing

Certification:CE

System compatibility

72A-560 belongs to MOOG 72A series servo valve.It is widely used in steam turbine DEH hydraulic control system for large power units,to drive turbine main valve and regulating valve.It is spare part for power plant hydraulic equipment overhaul.

Function

72A-560 is two-stage mechanical feedback servo valve.It adopts dry torque motor and double nozzle flapper pilot stage,with large flow capacity and low hysteresis.Mechanical feedback spring feeds back spool position,output hydraulic flow proportional to input current to realize precise adjustment of turbine governing valve.

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 72A series high flow turbine 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

72A-560 is MOOG two-stage mechanical feedback hydraulic servo valve with large flow and robust steel body,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.