D634-374C
D634-374C belongs to MOOG D634 direct drive servo valve series conforming to ISO 4401 Size 05 mounting standard. It adopts permanent magnet linear force motor to drive spool directly without pilot oil supply. Built-in LVDT realizes closed-loop position control with excellent precision and repeatability. Dynamic characteristics remain stable despite pressure fluctuation. Spring centering mechanism enables automatic neutral reset and fail-safe protection when power cuts off. This model balances flow capacity and dynamic response for universal heavy industrial control.
Description
1. General Description
D634-374C belongs to MOOG D634 direct drive servo valve series conforming to ISO 4401 Size 05 mounting standard. It adopts permanent magnet linear force motor to drive spool directly without pilot oil supply. Built-in LVDT realizes closed-loop position control with excellent precision and repeatability. Dynamic characteristics remain stable despite pressure fluctuation. Spring centering mechanism enables automatic neutral reset and fail-safe protection when power cuts off. This model balances flow capacity and dynamic response for universal heavy industrial control.
2. Model Definition
D634: Direct drive servo valve series374: Balanced flow and dynamic performance configurationC: Revision version C
3. Hydraulic Specifications
Mounting standard: ISO 4401 Size 05 (NG10)Max working pressure of P, A, B ports: 350 barMaximum T port pressure: 50 barRated flow at 35 bar pressure drop: 130 L/minMaximum flow rate: approx 195 L/minInternal leakage: ≤2.9 L/minApplicable fluid: ISO 11158 mineral oilFluid temperature range: -20 °C ~ +80 °CRequired fluid cleanliness: ISO 4406 17/14/11Total weight: approx 7.1 kg
4. Dynamic Performance
Full stroke step response: ≤20 ms-3dB frequency bandwidth: 52~62 HzHysteresis: less than 0.26% full scalePosition resolution: less than 0.13% 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: 2.8 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
Pilot-free design simplifies installation and routine maintenanceBalanced flow and response adapts diverse working conditionsPressure independent dynamic performance ensures stable runningHigh precision closed-loop control guarantees accurate motion regulationSpring reset structure provides reliable power failure safety protectionIntegrated electronic module owns compact size and strong durability
7. Application Scope
Heavy-duty hydraulic press facilitiesMaterial fatigue and dynamic testing equipmentMedium frequency vibration simulation test benchesClosed-loop position, speed and pressure control hydraulic 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 suggested for signal connection
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