D634-402C is a pilotless direct-drive servo valve of MOOG D634 series conforming to ISO4401-05 (NG10). It adopts integrated 24VDC PWM drive and built-in LVDT closed-loop feedback. Designed for 350bar high pressure and large flow working conditions, it serves heavy-duty closed-loop hydraulic systems.

Brand: MOOGModel: D634-402CCategory: Pilotless electro-hydraulic direct drive servo valveMounting Standard: ISO4401-05 (NG10)Drive Mode: Permanent magnet linear force motor, no pilot oil requiredPower Supply: 24VDC, operating range 18-32VDCFeedback: Built-in LVDT spool position closed-loop detectionReset Mode: Spring centering, neutral position restoration after power failureProtection Class: IP65Weight: Approx. 11.8kgAlias: Large flow DDV servo valve, high pressure direct drive valve

Core Function: Accurately adjust hydraulic flow and direction by analog signals. Complete closed-loop control of position, velocity, pressure and thrust. It features low leakage, strong contamination resistance and pressure-independent dynamic performance.Product Positioning: High-flow model of D634 series, capable of replacing multi-stage combined valve sets for severe heavy-duty hydraulic applications.

Max working pressure: 350barMax T-port pressure: ≤50bar (without Y port), ≤350bar (with Y port)Rated flow at 35bar pressure drop: 620-650L/minPeak flow: Approx. 760L/minNull internal leakage: ≤11.0L/minApplicable fluid: ISO11158 mineral oilFluid temperature: -20℃ ~ 80℃Fluid cleanliness: ISO4406 17/14/11

Full stroke step response: ≤8ms-3dB frequency bandwidth: 110-120HzHysteresis: ＜0.13% full scaleControl resolution: ＜0.03% full scaleTemperature drift: ＜0.5% full scale

Max operating current: 7.2AStandard control signal: ±10VDCOptional signal: ±10mA, 4-20mASpool position feedback: 0-10VDCConnector: M18 6-pin with PE terminalAmbient temperature: -20℃ ~ 60℃Certification: CE compliant

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

Heavy forging, extrusion and high-pressure hydraulic machineryAerospace and automotive structural test equipmentHigh-load vibration test and motion simulation systemsMarine and offshore engineering hydraulic systemsHydraulic control devices for wind power and large construction machinery