D634-404C is a high-performance pilotless direct-drive servo valve of MOOG D634 series, manufactured per ISO4401-05 (NG10). Equipped with 24VDC integrated PWM drive and built-in LVDT spool feedback, it supports 350bar high pressure and ultra-large flow, applicable to extreme heavy-duty closed-loop hydraulic systems.

Brand: MOOGModel: D634-404CCategory: 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 closed-loop position detectionReset Mode: Spring centering, automatic neutral return on power lossProtection Class: IP65Weight: Approx. 12.5kgAlias: Ultra-large flow DDV servo valve, high pressure control valve

Core Function: Precisely control hydraulic flow and direction via analog signals, achieve closed-loop adjustment of position, velocity, pressure and thrust. It features low leakage, strong anti-pollution ability and pressure-stable dynamic performance.Product Positioning: Top-grade high-flow high-response model, replacing multi-stage valve groups for rigorous heavy-load hydraulic working conditions.

Max working pressure: 350barMax T-port pressure: ≤50bar (without Y port), ≤350bar (with Y port)Rated flow at 35bar pressure drop: 700-730L/minPeak flow: Approx. 850L/minNull internal leakage: ≤12.0L/minApplicable fluid: ISO11158 mineral oilFluid temperature: -20℃ ~ 80℃Fluid cleanliness: ISO4406 17/14/11

Full stroke step response: ≤7ms-3dB frequency bandwidth: 120-130HzHysteresis: ＜0.11% full scaleControl resolution: ＜0.02% full scaleTemperature drift: ＜0.4% full scale

Max operating current: 7.8AStandard 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 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 super high-pressure hydraulic equipmentAerospace and automotive structural test platformsHigh-load vibration test and motion simulation devicesMarine and offshore hydraulic control systemsLarge engineering machinery and wind power hydraulic facilities