D634-502A is a pilotless direct-drive servo valve of MOOG D634 series complying with ISO4401-05 (NG10). Equipped with 24VDC integrated PWM drive and LVDT spool position feedback. It features pressure-independent dynamic performance and strong anti-pollution capacity, suitable for medium-flow high-performance closed-loop hydraulic systems.

Brand: MOOGModel: D634-502ACategory: 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 Type: Integrated LVDT spool closed-loop detectionReset Mode: Spring centering, neutral position recovery after power lossProtection Class: IP65Weight: Approx. 6.3kgConnector: M18 6-pin with PE terminal

Core Function: Precisely control hydraulic flow and direction via analog signals, realize closed-loop regulation of position, velocity, pressure and thrust. It delivers favorable repeatability, low hysteresis and stable pressure-independent dynamic response.Product Positioning: Standard medium-flow model of D634 series, applicable to working conditions requiring balanced precision and dynamic performance.

Max working pressure: 350barMax T-port pressure: ≤50bar (without Y port), ≤350bar (with Y port)Rated flow at 35bar pressure drop: 180L/minNull internal leakage: 0.2-1.5L/minApplicable fluid: ISO11158 mineral oilFluid temperature: -20℃ ~ 80℃Fluid cleanliness: ISO4406 17/14/11

Full stroke step response: ≤10ms-3dB frequency bandwidth: 50-70HzHysteresis: ＜0.18% full scaleControl resolution: ＜0.09% full scaleTemperature drift: ＜1.2% full scale

Standard control signal: ±10VDCOptional signal: ±10mA, 4-20mASpool feedback signal: 0-10VDCAmbient 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

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