Model Code Explanation (D661-4590C)

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

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

• 59: Rated flow ≈ 200 L/min (Δp = 35 bar per land)

• 0: Standard dynamics, single LVDT feedback, standard null stability

• C: Command signal = ±10 VDC (differential), non‑explosion‑proofMoog Inc.

Technical Specifications

Part Number: D661-4590C

Mounting

Control Function

Hydraulic Parameters

• Rated Flow (Δp = 35 bar): 200 L/min (±8%)Moog Inc.

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

• Pilot Pressure (X): 21–280 bar (internal P or external X)

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

• 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. 6.5–6.8 kg

Electrical Parameters

• Supply: 24 VDC (18–32 VDC), quiescent 270 mA, dynamic ~600 mA

• Command Signal: ±10 VDC (differential, 10 kΩ impedance)Moog Inc.

• 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%): 8–10 ms @ 210 bar (standard dynamics for 200 L/min)

• Hysteresis: <0.30% (closed‑loop)

• Linearity: <±0.35%

• Resolution: <0.05%

Interface & Communication Configuration

• Electrical: 6+PE connector; 24 VDC power, ±10 V differential command, 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)

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

Core Functions

1. 200 L/min Ultra‑High Flow: For large‑scale, high‑throughput hydraulic systems

2. Standard Dynamic Response: 8–10 ms step response, optimized for 200 L/min

3. ±10 V Differential Command: High‑noise‑immunity signal for industrial environmentsMoog Inc.

4. Precision Closed‑Loop Control: LVDT feedback with low hysteresis for accurate positioningMoog Inc.

5. ServoJet® Pilot: Jet‑pipe design reduces energy use and improves contamination resistanceMoog Inc.

Applicable Scenarios

• Heavy‑Duty Industrial Presses: Large stamping, forging, and extrusion presses

• High‑Capacity Hydraulic Test Benches: Aerospace, automotive, and structural testing

• Metallurgical & Mining Machinery: Rolling mills, continuous casting, and heavy excavators

• Large‑Scale CNC & Machine Tools: Ultra‑precision large‑format machining centers

Compatibility & Installation Notes

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

• Upgrade: Drop‑in replacement for 150 L/min models (e.g., D661‑4580D/4586E) when higher flow is needed

• System Requirements: 24 VDC supply, ±10 V differential analog controller, 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