Model Code Explanation (D661-4090)

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

• 4: Ultra‑high‑flow platform

• 09: High‑flow spool/pressure/heavy‑duty base

• 0: Standard‑temperature, single‑feedback, maximum‑flow variant

Technical Specifications

Hydraulic

• Nominal Flow (Δp = 35 bar): 250 L/min (±8%)

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

• Pilot Pressure (X): 21–280 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. 6.0 kg

Electrical

• Supply: 24 VDC (18–32 VDC), quiescent 240 mA, dynamic 450 mAMoog Inc.

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

• Feedback Signal: 4–20 mA (single LVDT spool position, ±0.02% FS accuracy)Moog Inc.

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

• Step Response (0→100%): ≤18 ms @ 210 barMoog Inc.

• Hysteresis: <0.25% (closed‑loop)

• Linearity: <±0.30%

• Resolution: <0.12%

Interface & Communication

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

• Feedback: Single integrated LVDT (full‑stroke closed‑loop, cost‑effective for high‑flow)Moog Inc.

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

Key Features

• Maximum Flow Capacity: 250 L/min nominal for large‑scale industrial hydraulic systems

• Heavy‑Duty Construction: Optimized for high‑pressure, continuous‑cycle operations

• Single‑LVDT Precision: Cost‑effective closed‑loop feedback for high‑flow accuracy needsMoog Inc.

• Standard Temperature Range: −20°C to +60°C ambient, ideal for heavy factory environments

• Enhanced Contamination Resistance: 2× higher than standard ServoJet modelsMoog Inc.

Applications

• Large‑scale industrial automation (heavy forging presses, large steel rolling mills)

• High‑flow industrial test benches (component endurance testing, high‑volume simulation)

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

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

• Energy (high‑flow hydraulic control, large turbine auxiliary systems)

Compatibility

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

• Drop‑in upgrade for lower‑flow D661 models (4051/4055/4059/4060/4061/4069/4070/4072/4077/4081/4085/4086)

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