D634-400C is the ultimate flagship pilotless direct-drive servo valve of MOOG D634 series, complying with ISO4401-05 (NG10) installation standard. Equipped with 24VDC integrated PWM drive and built-in LVDT closed-loop position feedback, it supports 350bar high pressure and super large flow, tailored for extreme heavy-duty closed-loop hydraulic scenarios.

Brand: MOOGModel: D634-400CCategory: Pilotless electro-hydraulic direct drive servo valveMounting Standard: ISO4401-05 (NG10)Drive Mode: Permanent magnet linear force motor, no pilot oil supplyPower Supply: 24VDC, operating range 18-32VDCFeedback Device: Built-in LVDT spool position feedbackReset Mode: Spring centering, back to neutral position when power offProtection Grade: IP65Weight: Approx. 11.8kgAlias: Super high flow servo valve, high pressure DDV valve

Core Function: Receives analog control signals to accurately adjust hydraulic flow and direction, realizing closed-loop control of position, speed, pressure and thrust. It owns low leakage, strong anti-pollution ability and stable dynamic performance irrelevant to pressure change.Product Positioning: Top maximum-flow high-response model of the series. It substitutes multi-stage combined valve groups, applicable to harsh working conditions with ultra-large flow, high pressure and frequent dynamic actions.

Max working pressure: 350barMax T-port pressure: ≤50bar (without Y port), ≤350bar (with Y port)Rated flow under 35bar pressure drop: 580-600L/minPeak flow: Approx. 720L/minNull internal leakage: ≤10.5L/minApplicable fluid: ISO11158 mineral oilFluid temperature range: -20℃ ~ 80℃Fluid cleanliness requirement: ISO4406 17/14/11

Full stroke step response: ≤9ms-3dB frequency bandwidth: 105-115HzHysteresis: ＜0.14% full scaleControl resolution: ＜0.04% full scaleTemperature drift: ＜0.6% full scale

Max operating current: 6.8AStandard control signal: ±10VDCOptional control signal: ±10mA, 4-20mASpool feedback signal: 0-10VDCInterface type: M18 6-pin connector with PE terminalAmbient working temperature: -20℃ ~ 60℃Certification: CE compliant

Shielded twisted signal cable, M18 waterproof connectorISO4401-05 standard installation manifoldHigh precision hydraulic filter24VDC low ripple stabilized power supplyServo controller, displacement sensor and pressure sensor

Heavy forging, extrusion and high-pressure hydraulic equipmentAerospace and automotive large structural test platformsHigh-load vibration test and motion simulation devicesMarine and offshore engineering hydraulic control systemLarge construction machinery and wind power hydraulic control equipment