Product Description
Model G123-817-006 is a DDV direct‑drive electro‑hydraulic servo valve from MOOG D634 series, mounting according to ISO4401‑05 (CETOP‑05 / NG10) sub‑plate standard, 4‑way zero‑lap spool valve design. It adopts permanent magnet linear force motor to drive spool directly, no pilot oil supply required. Integrated on‑board OBE PWM electronics with built‑in LVDT spool position sensor; no external servo amplifier needed, accepts standard analog command signals, factory calibrated and null‑adjusted before delivery. Fail‑safe spring‑centred design: spool returns to neutral upon power loss or cable breakage. Better contamination tolerance compared with conventional two‑stage nozzle‑flapper servo valves; dynamic performance independent of supply pressure. Provides continuous precise flow & direction regulation for closed‑loop position, velocity, pressure and force hydraulic control systems.
Key Specifications
| Item | Specification |
|---|---|
| Part Number | G123-817-006 |
| Series | MOOG D634 DDV Direct‑Drive Servo Valve |
| Mounting | ISO4401‑05 (CETOP‑05 / NG10) sub‑plate mounting |
| Actuation | Permanent magnet linear force motor direct spool drive |
| Valve Construction | 4‑way zero‑lap spool valve, built‑in LVDT spool position feedback |
| Max Operating Pressure | P/A/B ports: 350 bar; T return port:50 bar; Y external drain port:350 bar |
| Rated Flow | 70 L/min at 35 bar per metering edge; Max flow 180 L/min |
| Step Response Time | ≤20 ms (0‑100% full spool stroke) |
| Power Supply | 24 VDC (19‑32 VDC operating range) |
| Command Signal | ±10 V, ±10 mA, 4‑20 mA analog input |
| Electronics | Integrated OBE PWM amplifier, external amplifier not required |
| Fail‑Safe Feature | Spring‑centred spool return on power loss / cable fault |
| Hysteresis | <0.3%, high resolution |
| Weight | Approx.2.5 kg |
| Fluid | Hydraulic oil; Operating temp.‑20～+80℃ |
| Certification | CE |
Applications
- Material test equipment: fatigue test machines, hydraulic vibration test benches, load simulation rigs for high‑precision force & displacement closed‑loop loading.
- Power & energy industry: steam turbine DEH electro‑hydraulic governing system, governor valve servo control for speed and load regulation.
- Metallurgy & heavy industry: mill screw‑down system, cold rolling strip correction units, heavy‑duty hydraulic servo actuators for harsh high‑vibration workshop environments.
- Precision forming machinery: servo hydraulic presses, die‑casting machines, accurate control of pressure, velocity and position for consistent forming quality.
- Test & simulation platforms: aerospace component hydraulic test rigs, custom‑built industrial test systems; spare‑part replacement & retrofitting for legacy hydraulic installations.
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