Model Code Explanation (D661-4077)

• D661: Series (ISO 4401‑05, integrated 24 VDC electronics)Moog Inc.

• 4: Flow rating code (medium‑high flow platform)

• 07: Spool/pressure/precision base code

• 7: High‑accuracy, high‑cycle, standard fail‑safe variant

Technical Specifications

Hydraulic

• Nominal Flow (Δp = 35 bar): 180 L/min (±5%)

• Max Operating Pressure (P/A/B): 350 bar (5,000 psi)Moog Inc.

• Pilot Pressure (X): 21–210 bar (internal P or external X)

• T Port Pressure (Y internal): 210 bar; (Y external): 350 barMoog Inc.

• Fluid: Mineral oil (DIN 51524), viscosity 15–45 mm²/s

• Temperature: Ambient −20°C to +60°C; Fluid −20°C to +80°C

• Weight: Approx. 5.9 kg

Electrical

• Supply: 24 VDC (18–32 VDC), quiescent 220 mA, dynamic 380 mAMoog Inc.

• Command Signal: ±10 V differential (10 kΩ impedance); optional ±10 mAMoog Inc.

• Feedback Signal: 4–20 mA (single LVDT spool position, ±0.015% FS accuracy)Moog Inc.

• Connector: 6+PE (EN 175201‑804), IP65 (connected)Moog Inc.

• Step Response (0→100%): ≤10 ms @ 210 bar (high‑accuracy tuned)

• Hysteresis: <0.18% (closed‑loop)

• Linearity: <±0.2%

• Resolution: <0.09%

Interface & Communication

• Electrical: 6+PE connector; analog ±10 V command, 24 VDC power, 4–20 mA LVDT feedbackMoog Inc.

• Feedback: Single integrated LVDT (full‑stroke closed‑loop, high linearity)

• Ports: P, A, B, T; optional external X (pilot) and Y (return)

Key Features

• High‑Accuracy Dynamics: 10 ms step response for fast, precise positioning/flow control

• Balanced Null Stability: Optimized spool geometry for minimal drift in high‑cycle operations

• Standard ServoJet® Pilot: Reliable contamination resistance, low leakage (<13 ml/min)

• Compact & Lightweight: 5.9 kg for easier manifold integration

• Standard Fail‑Safe: Spring‑centers on power loss/fault; high‑pressure Y port ratingMoog Inc.

Applications

• Precision industrial automation (high‑speed CNC, tight‑tolerance pressing)

• Dynamic test benches (fatigue testing, vibration simulation, high‑cycle durability)

• Metallurgy (precision roll gap, speed‑critical tension control)

• Heavy machinery (high‑accuracy injection molding, die‑casting)

• Energy (precision hydraulic control, turbine auxiliary systems)

Compatibility

• Interchangeable with D661 (G/C/A), D662/D663 (ISO 4401‑05)Moog Inc.

• Drop‑in upgrade for D633/D634 and lower‑flow D661 models (4051/4055/4059/4060/4061/4069)Moog Inc.

• Requires 24 VDC supply, analog controller (±10 V in / 4–20 mA out), ISO 4401‑05 manifold