D634-403C is a top-tier pilotless direct-drive servo valve under MOOG D634 series, compliant with ISO4401-05 (NG10). Fitted with 24VDC integrated PWM drive and built-in LVDT position feedback, it delivers extreme flow capacity and rapid dynamic response for 350bar high-pressure heavy-duty closed-loop hydraulic systems.

Brand: MOOGModel: D634-403CCategory: Pilotless electro-hydraulic direct drive servo valveMounting Standard: ISO4401-05 (NG10)Drive Mode: Permanent magnet linear force motor, no pilot oil neededPower Supply: 24VDC, working range 18-32VDCFeedback: Built-in LVDT spool closed-loop detectionReset Mode: Spring centering, back to neutral when power cuts offProtection Class: IP65Weight: Approx. 12.2kgAlias: Super large flow DDV servo valve, high pressure hydraulic control valve

Core Function: Regulate hydraulic flow and direction precisely via analog signals, realizing closed-loop control of position, velocity, pressure and thrust. It owns low internal leakage, excellent dirt resistance and stable pressure-independent dynamic characteristics.Product Positioning: Premium high-flow high-response model, replacing complicated multi-stage valve assemblies for ultra-severe heavy-load hydraulic working scenarios.

Max working pressure: 350barMax T-port pressure: ≤50bar (without Y port), ≤350bar (with Y port)Rated flow @35bar pressure drop: 660-690L/minPeak flow: Approx. 800L/minNull internal leakage: ≤11.5L/minApplicable fluid: ISO11158 mineral oilFluid temperature: -20℃ ~ 80℃Fluid cleanliness: ISO4406 17/14/11

Full stroke step response: ≤7.5ms-3dB frequency bandwidth: 115-125HzHysteresis: ＜0.12% full scaleControl resolution: ＜0.03% full scaleTemperature drift: ＜0.5% full scale

Max operating current: 7.5AStandard control signal: ±10VDCOptional signal: ±10mA, 4-20mASpool feedback signal: 0-10VDCConnector: M18 6-pin with PE terminalAmbient temperature: -20℃ ~ 60℃Certification: CE compliant

Shielded twisted signal cable, M18 waterproof connectorISO4401-05 standard valve mounting baseHigh precision hydraulic filter24VDC low ripple stabilized power supplyServo controller, displacement and pressure sensors

Heavy forging, extrusion and large-scale high-pressure hydraulic equipmentAerospace and automotive structural strength test benchesHigh-load vibration test and motion simulation facilitiesMarine and offshore engineering hydraulic control systemsLarge construction machinery and wind power hydraulic control units