Model Code Explanation (D661-4099)

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

• 4: Ultra‑high‑flow platform

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

• 9: High‑temperature, single‑feedback, premium heavy‑duty 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)Moog Inc.

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

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

• Temperature: Ambient −20°C to +85°C; Fluid −20°C to +90°C (high‑temperature rating)Moog Inc.

• Weight: Approx. 6.2 kg

Electrical

• Supply: 24 VDC (18–32 VDC), quiescent 240 mA, dynamic 480 mAMoog Inc.

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

• Feedback Signal: 4–20 mA (single LVDT spool position, ±0.025% FS accuracy)Moog Inc.

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

• Step Response (0→100%): ≤20 ms @ 210 barMoog Inc.

• Hysteresis: <0.30% (closed‑loop)Moog Inc.

• Linearity: <±0.35%

• Resolution: <0.15%Moog Inc.

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, optimized for high‑flow/high‑temp)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 extreme‑flow industrial hydraulic systems

• High‑Temperature Rated: Ambient up to +85°C, fluid up to +90°C for harsh environmentsMoog Inc.

• Heavy‑Duty Construction: Reinforced body and seals for continuous high‑pressure cyclingMoog Inc.

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

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

Applications

• Extreme‑flow industrial automation (super‑heavy forging presses, giant steel rolling mills)

• High‑flow/high‑temperature test benches (component endurance testing, extreme‑condition simulation)

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

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

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

Compatibility

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

• Drop‑in upgrade for lower‑flow D661 models (4051/4055/4059/4060/4061/4069/4070/4072/4077/4081/4085/4086/4090)Moog Inc.

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