Model Code Explanation (D661-4496E)

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

• 4: 4‑way, zero‑lap, linear flow characteristic

• 49: Rated flow ≈ 90 L/min (Δp = 35 bar per land)

• 6: High‑dynamic response, single LVDT feedback

• E: Enhanced performance, premium null stability, standard industrial grade

Technical Specifications

Part Number: D661-4496E

Mounting

Control Function

Hydraulic Parameters

• Rated Flow (Δp = 35 bar): 90 L/min (±8%)Moog Inc.

• 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 +60°C; Fluid −20°C to +80°CMoog Inc.

• Weight: Approx. 5.8 kgMoog Inc.

Electrical Parameters

• Supply: 24 VDC (18–32 VDC), quiescent 230 mA, dynamic ~500 mAMoog Inc.

• Command Signal: ±10 VDC (differential, 10 kΩ impedance) or 4–20 mAMoog Inc.

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

• Connector: 11‑pin + PE (EN 175201‑804, IP65)Moog Inc.

• Step Response (0→100%): 7–11 ms @ 210 bar (high dynamics)Moog Inc.

• Hysteresis: <0.25% (closed‑loop)

• Linearity: <±0.25%

• Resolution: <0.10%

Interface & Communication Configuration

• Electrical: 11‑pin + PE connector; ±10 V command, 24 VDC power, 4–20 mA LVDT feedbackMoog Inc.

• Feedback: Single integrated LVDT (full‑stroke closed‑loop, high accuracy)Moog Inc.

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

• Seal Material: NBR (standard) or FKM (optional, high‑temperature)Moog Inc.

Core Functions

1. 90 L/min Medium‑High Flow: Balanced flow for high‑precision, medium‑capacity systemsMoog Inc.

2. High‑Dynamic Response: 7–11 ms step response for fast, accurate positioningMoog Inc.

3. Closed‑Loop Spool Control: Integrated LVDT ensures real‑time position feedback and consistent precisionMoog Inc.

4. ServoJet® Pilot: Jet‑pipe design reduces energy use, improves contamination resistance, and lowers hysteresisMoog Inc.

5. Integrated Digital Amplifier: On‑board PID, ramp generator, fault diagnostics, and EMC protectionMoog Inc.

6. Enhanced Null Stability: Minimal null shift over temperature and time for long‑term precision

Applicable Scenarios

• Metal Forming: Injection molding, die‑casting, stamping presses (medium‑high flow, high precision)Moog Inc.

• Heavy Machinery: Steel mill roll gap control, hydraulic presses, material handlingMoog Inc.

• Test Systems: Aerospace component testing, vibration simulation tablesMoog Inc.

• Industrial Automation: High‑speed positioning, force control, and closed‑loop hydraulic systemsMoog Inc.

Compatibility & Installation Notes

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

• Upgrade: Drop‑in replacement for lower‑flow D661‑4xxx models (e.g., 4479C/4196)Moog Inc.

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

Usage & Maintenance Instructions

1. Installation: Mount on flat surface (flatness ≤0.02 mm/100 mm; Ra <1 μm) with M6×55/60 bolts (13 Nm, diagonal)Moog Inc.

2. Fluid: ISO VG 32–46, NAS 1638 cleanliness class ≤8Moog Inc.

3. Maintenance: Replace internal filter every 5,000 hours; inspect leaks/connectors periodicallyMoog Inc.

4. Precautions: Avoid voltage spikes/reverse polarity; do not open standard (E) models in field