D634-386C
D634-386C belongs to MOOG D634 direct drive servo valve series with standard ISO 4401 Size 05 mounting interface. Permanent magnet linear force motor directly drives the spool without pilot oil supply. Built-in LVDT sensor realizes closed-loop position control to guarantee reliable precision and repeatability. Dynamic performance keeps stable against pressure variation. Spring centering structure returns spool to neutral position automatically and provides fail-safe protection when power fails. This high flow model is applicable to heavy-duty large hydraulic control systems.
Description
1. General Description
D634-386C belongs to MOOG D634 direct drive servo valve series with standard ISO 4401 Size 05 mounting interface. Permanent magnet linear force motor directly drives the spool without pilot oil supply. Built-in LVDT sensor realizes closed-loop position control to guarantee reliable precision and repeatability. Dynamic performance keeps stable against pressure variation. Spring centering structure returns spool to neutral position automatically and provides fail-safe protection when power fails. This high flow model is applicable to heavy-duty large hydraulic control systems.
2. Model Definition
D634: Direct drive servo valve series386: Extra high flow and medium dynamic configurationC: Revision version C
3. Hydraulic Specifications
Mounting standard: ISO 4401 Size 05 (NG10)Max working pressure of P, A, B ports: 350 barMax pressure of T port: 50 barRated flow at 35 bar pressure drop: 180 L/minMaximum flow rate: approximately 250 L/minInternal leakage: ≤3.5 L/minApplicable fluid: ISO 11158 mineral oilFluid temperature range: -20 °C ~ +80 °CRequired fluid cleanliness: ISO 4406 17/14/11Total weight: approximately 7.8 kg
4. Dynamic Performance
Full stroke step response: ≤24 ms-3dB frequency bandwidth: 45~55 HzHysteresis: less than 0.35% full scalePosition resolution: less than 0.18% full scaleNull drift under 55K temperature change: less than 2.0% full scale
5. Electrical Specifications
Supply voltage: 24 VDC, working range 18~32 VDCMaximum operating current: 3.6 AStandard control signal: ±10 VOptional signal: ±10 mA, 4-20 mASpool position feedback output: 0-10 VDCConnector type: M18, 6 pins with PE terminal, IP65 protection gradeAmbient temperature: -20 °C ~ +60 °CEMC certification: CE compliant
6. Key Features
Pilotless direct drive design simplifies installation and maintenanceSuper large flow capacity meets heavy load hydraulic driving demandsPressure independent dynamic characteristic ensures stable operationHigh precision closed-loop control achieves accurate motion adjustmentFail-safe spring reset mechanism protects system during power outageIntegrated electronic drive unit features compact and anti-interference structure
7. Application Scope
Heavy industrial hydraulic press and forging equipmentLarge aerospace and automotive component test rigsHigh force hydraulic drive and simulation machineryIndustrial closed-loop position, velocity and pressure control systems
8. Pin Assignment
Pin 1: +24 VDC powerPin 2: Power groundPin 3: Command signal positivePin 4: Command signal negativePin 5: Position feedback outputPin 6: Feedback groundPE: Protective earthShielded twisted pair cable is recommended for signal wiring
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