• Model: D633-R04KO1MOVSS2

• Brand: MOOG

• Type: Single‑stage, pilotless direct‑drive electro‑hydraulic servo valve (DDV), 2×2‑way (4/2) configurationMoog Inc.

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

• Rated Flow: 4 L/min (at Δp=35 bar per edge)Moog Inc.

Mechanical & Environmental

• Configuration: 4/2‑way, permanent magnet linear force motor, integrated closed‑loop electronicsMoog Inc.

• Mounting: ISO 4401‑03‑03‑0‑94 (NG6)Moog Inc.

• Weight: ≈2.5 kg

• Protection: Connector IP67, body IP65

• Ambient Temp: −20 °C to +60 °C

• Fluid Temp: −20 °C to +80 °C

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

• Seal Material: FPM (fluoro rubber)

Hydraulic Specifications

• Rated Flow: 4 L/min (Δp=35 bar/edge)Moog Inc.

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

• Null Leakage: ≤0.4 L/min (typical)

• Features: Pressure‑independent dynamics, spring centering on power‑offMoog Inc.

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%Moog Inc.

• Linearity: ≤0.1%Moog Inc.

• Resolution: ≤0.05%Moog Inc.

Applications

• Precision flow control, 2‑axis synchronisation

• Material testing, fatigue rigs

• High‑precision positioning, hydraulic robots

• Injection moulding, die‑casting closed‑loop control