Model Code Explanation (D661-4085)

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

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

• 08: Spool/pressure/heavy‑duty base code

• 5: High‑temperature, dual‑feedback, premium fail‑safe variant

Technical Specifications

Hydraulic

• Nominal Flow (Δp = 35 bar): 220 L/min (±8%)

• 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; high‑temp compatible

• Temperature: Ambient −40°C to +75°C; Fluid −40°C to +90°C (extended premium range)

• Weight: Approx. 6.1 kg

Electrical

• Supply: 24 VDC (18–32 VDC), quiescent 240 mA, dynamic 400 mA

• Command Signal: ±10 V differential (10 kΩ impedance); optional ±10 mA

• Feedback Signal: 4–20 mA (dual LVDT spool position, ±0.01% FS accuracy)

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

• Step Response (0→100%): ≤14 ms @ 210 bar (precision‑tuned for stability)

• Hysteresis: <0.15% (closed‑loop)

• Linearity: <±0.18%

• Resolution: <0.08%

Interface & Communication

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

• Feedback: Dual integrated LVDT (full‑stroke closed‑loop, fault‑tolerant)

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

Key Features

• Ultra‑High Flow: 220 L/min nominal for large‑scale, high‑demand hydraulic systems

• Dual‑LVDT Redundancy: Fault‑tolerant feedback for zero‑downtime critical applications

• Extended High‑Temp Range: −40°C to +75°C ambient, ideal for extreme environments

• Premium Null Stability: <0.15% hysteresis for long‑term precision in high‑cycle operations

• Enhanced Contamination Resistance: 3× higher than standard ServoJet models

Applications

• Critical industrial automation (large forging presses, high‑speed steel rolling mills)

• High‑temperature test benches (aerospace component testing, endurance simulation)

• Metallurgy (precision roll gap control, high‑temperature tension systems)

• Heavy machinery (mining equipment, large injection molding, die‑casting)

• Energy (precision hydraulic control, turbine auxiliary systems)

Compatibility

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

• Drop‑in upgrade for D633/D634 and lower‑flow D661 models (4051/4055/4059/4060/4061/4069/4070/4072/4077/4081)

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