Model Code Explanation (D661-4572C)

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

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

• 57: Rated flow ≈ 100 L/min (Δp = 35 bar per land)

• 2: High‑dynamic response, single LVDT feedback, enhanced null stability

• C: Standard performance, non‑explosion‑proof

Technical Specifications

Part Number: D661-4572C

Mounting

Control Function

Hydraulic Parameters

• Rated Flow (Δp = 35 bar): 100 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. 5.8–6.0 kg

Electrical Parameters

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

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

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

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

• Step Response (0→100%): 6.5–8 ms @ 210 bar (high dynamics for 100 L/min)

• Hysteresis: <0.20% (closed‑loop)Moog Inc.

• Linearity: <±0.25%

• Resolution: <0.05%

Interface & Communication Configuration

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

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

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

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

Core Functions

1. 100 L/min Medium Flow: Balanced flow for precision applications needing both speed and accuracy

2. High‑Dynamic Response: 6.5–8 ms step response, fastest in D661‑4xxx series for 100 L/min

3. Enhanced Closed‑Loop Control: Tight LVDT feedback with ultra‑low hysteresis for precise positioning

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

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

Applicable Scenarios

• Precision Metal Forming: High‑speed stamping, fine blanking, and precision injection molding (fast response critical)

• Test & Simulation Systems: Vibration tables, fatigue test rigs, and aerospace component testing (high dynamics required)

• Machine Tool Hydraulics: CNC machine positioning, high‑speed press brakes, and precision machining centers

• Industrial Automation: Closed‑loop position/velocity control requiring high accuracy and fast settling time

Compatibility & Installation Notes

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

• Upgrade: Drop‑in replacement for lower‑flow D661‑4536C/4538C when higher dynamics are needed

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

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)

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

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

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