D634-372C
D634-372C belongs to MOOG D634 direct drive servo valve series with standard ISO 4401 Size 05 mounting dimension. It adopts permanent magnet linear force motor to drive spool directly without external pilot oil supply. Built-in LVDT sensor realizes closed-loop spool position control, ensuring excellent positioning accuracy and repeatability. The valve maintains stable dynamic performance regardless of load pressure variation. Spring centering structure automatically returns spool to neutral position and achieves fail-safe protection once power cuts off. This model features large flow capacity and reliable performance for heavy-duty hydraulic control occasions.
Description
1. General Description
D634-372C belongs to MOOG D634 direct drive servo valve series with standard ISO 4401 Size 05 mounting dimension. It adopts permanent magnet linear force motor to drive spool directly without external pilot oil supply. Built-in LVDT sensor realizes closed-loop spool position control, ensuring excellent positioning accuracy and repeatability. The valve maintains stable dynamic performance regardless of load pressure variation. Spring centering structure automatically returns spool to neutral position and achieves fail-safe protection once power cuts off. This model features large flow capacity and reliable performance for heavy-duty hydraulic control occasions.
2. Model Definition
D634: Direct drive servo valve series372: 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 port: 350 barMaximum allowable pressure of T port: 50 barRated flow under 35 bar pressure drop: 160 L/minMaximum working flow: approx 230 L/minInternal leakage volume: ≤3.2 L/minApplicable hydraulic fluid: ISO 11158 standard mineral oilWorking fluid temperature range: -20 °C ~ +80 °CRequired fluid cleanliness grade: ISO 4406 17/14/11Overall weight: approx 7.2 kg
4. Dynamic Performance
Full stroke step response time: ≤22 ms-3dB frequency bandwidth: 48~58 HzHysteresis error: less than 0.3% full scalePosition resolution: less than 0.15% full scaleNull drift under 55K temperature fluctuation: less than 1.7% full scale
5. Electrical Specifications
Rated supply voltage: 24 VDC, operating voltage range 18~32 VDCMaximum working current: 2.9 ADefault control command signal: ±10 VOptional control signal type: ±10 mA, 4-20 mASpool position feedback output signal: 0-10 VDCElectrical connector specification: M18 interface, 6 pins plus PE terminal, IP65 protection levelAmbient working temperature: -20 °C ~ +60 °CElectromagnetic compatibility: CE certification compliant
6. Key Features
Pilotless direct drive structure simplifies installation and daily maintenanceLarge flow output meets heavy load hydraulic driving demandPressure independent dynamic characteristic guarantees stable operationHigh precision closed-loop control ensures accurate motion adjustmentSpring reset design provides safe protection against power failureIntegrated drive electronics compact structure with strong environmental adaptability
7. Application Scope
Heavy duty hydraulic press equipmentLarge scale material fatigue testing systemMedium speed high force vibration simulation platformIndustrial closed-loop position, speed and pressure control hydraulic system
8. Pin Assignment
Pin 1: +24 VDC power supplyPin 2: Power groundPin 3: Positive command signalPin 4: Negative command signalPin 5: Position feedback signal outputPin 6: Feedback signal groundPE: Protective earth terminalShielded twisted pair cable is recommended for signal wiring connection
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