D634-331C
D634-331C is a single-stage pilotless direct drive servo valve of MOOG D634 series complying with ISO 4401 Size 05 mounting standard. Permanent magnet linear force motor directly drives the spool without pilot oil supply. Built-in LVDT achieves closed-loop position control with excellent linearity and repeatability. Dynamic characteristics remain stable regardless of load pressure change. Spring centering structure realizes fail-safe neutral reset when power fails. This model features 60 L/min rated flow and improved dynamic response.
Description
1. General Description
D634-331C is a single-stage pilotless direct drive servo valve of MOOG D634 series complying with ISO 4401 Size 05 mounting standard. Permanent magnet linear force motor directly drives the spool without pilot oil supply. Built-in LVDT achieves closed-loop position control with excellent linearity and repeatability. Dynamic characteristics remain stable regardless of load pressure change. Spring centering structure realizes fail-safe neutral reset when power fails. This model features 60 L/min rated flow and improved dynamic response.
2. Model Definition
D634: Direct drive servo valve series331: High response configuration with 60 L/min flow ratingC: Revision version C
3. Hydraulic Specifications
Mounting standard: ISO 4401 Size 05 (NG10)Max working pressure(P,A,B): 350 barT port maximum pressure: 50 barRated flow at 35 bar pressure drop: 60 L/minMaximum flow rate: approx 110 L/minInternal leakage: ≤1.0 L/minApplicable fluid: ISO 11158 mineral oilFluid temperature range: -20 °C ~ +80 °CRequired fluid cleanliness: ISO 4406 17/14/11Total weight: approx 6.3 kg
4. Dynamic Performance
Full stroke step response: ≤15 ms-3dB frequency bandwidth: 60~70 HzHysteresis: less than 0.2% full scaleResolution: less than 0.1% full scaleNull drift under 55K temperature change: less than 1.5% full scale
5. Electrical Specifications
Supply voltage: 24 VDC, working range 18~32 VDCMaximum operating current: 3.5 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 working temperature: -20 °C ~ +60 °CEMC certification: CE compliant
6. Key Features
Pilot oil free design for easy installation and maintenanceFast response and high positioning precisionPressure independent dynamic performanceFail-safe protection by spring centering mechanismIntegrated compact electronic drive unit
7. Application Scope
High precision hydraulic press equipmentDynamic fatigue testing machinesHigh speed industrial automatic control systemClosed-loop position, velocity and pressure control system
8. Pin Assignment
Pin 1: +24 VDCPin 2: Power groundPin 3: Command signal positivePin 4: Command signal negativePin 5: Position feedback outputPin 6: Feedback groundPE: Protective earthUse shielded twisted pair cable for signal connection
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