Basic Identification

• Model：D633‑D2501B

• Brand：MOOG

• Type：Single‑stage, pilotless direct‑drive electro‑hydraulic servo valve (DDV)

• Series：D633 (ISO 4401 Size 03 / NG6)

• Rated Flow：20 L/min (at Δp=35 bar per edge)

Mechanical & Environmental

• Configuration：4/3‑way, permanent magnet linear force motor, integrated closed‑loop electronics

• Mounting：ISO 4401‑03‑03‑0‑94 (NG6)

• Weight：≈2.5 kg

• Protection：Connector IP67, body IP65

• Ambient Temp：−20 °C to +60 °C

• Fluid Temp：−20 °C to +70 °C

• Fluid：Mineral hydraulic oil, ISO 4406 18/15/12; viscosity 15–100 mm²/s

Hydraulic Specifications

• Rated Flow：20 L/min

• Max Working Pressure：P/A/B 350 bar; T port (without Y) 50 bar; T port (with Y) 350 barMoog Inc.

• Null Leakage：≤0.8 L/min

• Max Flow：≈40 L/min

Electrical Specifications

• Supply：24 VDC (18–32 VDC)Moog Inc.

• Control Signal：±10 V, ±10 mA, 4–20 mAMoog Inc.

• Feedback：4–20 mA spool position

• Max Current：≤1.2 A

• Connector：M12 (6+PE)Moog Inc.

Performance

• Step Response：≤12 ms (0–100%)Moog Inc.

• Hysteresis：≤0.2%

• Linearity：≤0.1%

• Resolution：≤0.05%

• Features：Pressure‑independent dynamics, spring centering on power‑off, high contamination resistance

Applications

• Injection molding machines, metal forming presses

• Metallurgical rolling mills, aerospace test benches

• Hydraulic robots, vibration simulation systems

• General industrial high‑dynamic hydraulic controls