Model Explanation (D661-1729E)

D661: Series Code (ISO 4401-05, Integrated Electronics, 24VDC)

1: Flow Specification Code (Medium Flow)

729: Valve Core / Pressure / Configuration Combination Code

E: Electrical Interface / Signal Type (11+PE Connector, Special Instructions / Feedback) Moog Inc. Technical Specifications

Part Number: D661-1729E

Valve Specification: ISO 4401-05 (CETOP 05), Diameter Ø6mm

Control Function: Four-way 3-position, Spring centered, Zero cover, Closed-loop position / flow / pressure control

Rated Flow (Δp = 35bar): 40L/min (±10%)

Maximum Working Pressure (P/A/B): 350bar Moog Inc.

Pilot Pressure: 21–210bar (Internal P or External X for oil supply) Moog Inc.

T Port Pressure: 210bar (Internal leakage Y); 350bar (External leakage Y) Moog Inc.

Response Time (0→100%): ≤10ms

Hysteresis: <0.3% (Closed-loop)

Linearity: <±0.25%

Electrical:

Power Supply: 24VDC (18–32VDC), Static 200mA, Dynamic 300mA Moog Inc.

Command Signal: ±10V / 4–20mA (Optional) Moog Inc.

Feedback Signal: 4–20mA (Valve core position LVDT)

Connection: 11+PE (EN 175201-804) Moog Inc.

Protection Grade: IP65 (Locked state) Moog Inc.

Hydraulic Oil: Mineral oil (DIN 51524), Viscosity 15–45mm²/s

Temperature:

Environment: −20°C ~ +60°C

Oil: −20°C ~ +80°C

Weight: Approximately 5.7kg

Sealing: Standard NBR; Optional FPM (V)

Interface and Communication Configuration

Electrical Interface: 11+PE connector, Analog command + 24VDC power supply + Position feedback Moog Inc.

Feedback: Integrated LVDT valve core position sensor (Full travel closed-loop)

Installation: 4-hole ISO 4401-05 installation (M5 screw, 8Nm)

Oil Ports: P, A, B, T; Optional external Y oil drain (When T > 210bar) Moog Inc. Core function

ServoJet Jet Pipe Pre-Controller: Anti-pollution, low leakage (<15ml/min), long lifespan

Integrated Closed-loop Electronics: On-board PID, high resolution, high repeatability

High Dynamic Response: ≤10ms step response, suitable for high-speed and precision working conditions

Low Zero-Position Leakage: Energy-saving, suitable for long-term pressure retention / standby systems

Fault Safety: Power-off valve core returns to center, customizable safety position is available Application scenario

Industrial Automation: High-precision machine tools, CNC machining centers, robot hydraulic systems

Test Equipment: Material mechanics testing machine, fatigue test bench, hydraulic simulation platform

Metallurgical Industry: Roll gap control of rolling machines, tension control system

Aerospace: Ground simulation equipment, flight test device

Compatibility Notes

Series Compatibility: Can be interchanged with D661 (G/C/A type), D662/D663 (ISO 4401-05)

Upgrade Replacement: Can directly replace the old servo valves of D633/D634 to improve dynamic performance

System Requirements: 24VDC power supply, analog quantity controller, ISO 4401-05 standard valve block