Model Code Explanation (D661-4539C)

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

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

• 53: Rated flow ≈ 150 L/min (Δp = 35 bar per land)

• 9: Ultra‑high‑dynamic response, dual LVDT feedback, maximum null stability

• C: Standard performance, non‑explosion‑proof

Technical Specifications

Part Number: D661-4539C

Mounting

Control Function

Hydraulic Parameters

• Rated Flow (Δp = 35 bar): 150 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. 5.9–6.1 kg

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 (dual LVDT, redundant) spool position, ±0.01% FS accuracy

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

• Step Response (0→100%): 4.5–7.5 ms @ 210 bar (ultra‑high dynamics for 150 L/min)

• Hysteresis: <0.15% (closed‑loop)

• Linearity: <±0.20%

• Resolution: <0.05%

Interface & Communication Configuration

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

• Feedback: Dual integrated LVDT (full‑stroke redundant closed‑loop, maximum reliability & accuracy)

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

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

Core Functions

1. 150 L/min High Flow: Mid‑high flow in D661‑4xxx series, optimized for high‑flow + ultra‑fast response

2. Ultra‑High‑Dynamic Response: 4.5–7.5 ms step response for extreme‑speed, precise high‑flow operation

3. Redundant Closed‑Loop Spool Control: Dual LVDT ensures fault‑tolerant real‑time position feedback and maximum precision

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

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

Applicable Scenarios

• Ultra‑High‑Speed Metal Forming: Large high‑speed injection molding, die‑casting, stamping presses (high flow + ultra‑fast response)

• High‑Precision Heavy Machinery: Steel mill roll gap control, large ultra‑high‑speed hydraulic presses, precision material handling

• Aerospace & Defense Test Systems: High‑flow vibration simulation tables, fatigue test rigs, aerospace component qualification

• Industrial Automation: Ultra‑high‑speed positioning, force control, and closed‑loop hydraulic systems requiring maximum reliability & dynamics

Compatibility & Installation Notes

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

• Upgrade: Drop‑in replacement for high‑dynamic D661‑4538C or standard‑dynamic 4536C/4507C

• System Requirements: 24 VDC supply, analog controller (±10 V in / dual 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