D634-373C
D634-373C is a direct drive servo valve of MOOG D634 series with ISO 4401 Size 05 mounting layout. Permanent magnet linear force motor drives the spool directly with no pilot oil required. Built-in LVDT sensor performs closed-loop spool position control to secure high precision and repeatability. Dynamic performance keeps stable under varying working pressure. Spring centering design returns spool to neutral position automatically when power fails, realizing reliable fail-safe function. This valve is designed for heavy-duty industrial closed hydraulic control.
Description
1. General Description
D634-373C is a direct drive servo valve of MOOG D634 series with ISO 4401 Size 05 mounting layout. Permanent magnet linear force motor drives the spool directly with no pilot oil required. Built-in LVDT sensor performs closed-loop spool position control to secure high precision and repeatability. Dynamic performance keeps stable under varying working pressure. Spring centering design returns spool to neutral position automatically when power fails, realizing reliable fail-safe function. This valve is designed for heavy-duty industrial closed hydraulic control.
2. Model Definition
D634: Direct drive servo valve series373: Medium 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: 140 L/minMaximum flow rate: approximately 210 L/minInternal leakage: ≤3.0 L/minApplicable fluid: ISO 11158 standard mineral oilFluid temperature range: -20 °C ~ +80 °CRequired fluid cleanliness: ISO 4406 17/14/11Total weight: approximately 7.1 kg
4. Dynamic Performance
Full stroke step response: ≤21 ms-3dB frequency bandwidth: 50~60 HzHysteresis: less than 0.28% full scalePosition resolution: less than 0.14% full scaleNull drift under 55K temperature change: less than 1.6% full scale
5. Electrical Specifications
Supply voltage: 24 VDC, working range 18~32 VDCMaximum operating current: 2.9 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 structure for easy installation and maintenanceMedium high flow capacity satisfies heavy load driving demandPressure independent dynamic property ensures steady operationHigh precision closed-loop control delivers accurate motion adjustmentFail-safe spring reset protects whole system against power outageIntegrated electronic drive unit features compact and durable structure
7. Application Scope
Heavy industrial hydraulic press equipmentLarge material fatigue testing machinesMedium speed high force vibration simulation platformsIndustrial position, velocity and pressure closed-loop hydraulic control system
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
Get a Quote