Model Explanation (D661-2503)

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

2: Flow specification code (High Flow)

503: Valve core / Pressure / Configuration combination code

Suffix (Common): G = Standard Four-way; J = 315bar; K = 350bar; A = ServoJet Pilot Technical Specifications

Part Number: D661-2503

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

Control Function: Four-way 3-position, Spring Centering, Zero Cover, Closed-loop Position/Flow/Pressure Control

Rated Flow (Δp=35bar): 60L/min (±10%)

Maximum Working Pressure (P/A/B): 350bar (K type)/315bar (J type)

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

T Port Pressure: 210bar (Internal Drain Y); 350bar (External Drain Y)

Response Time (0→100%): ≤12ms

Hysteresis: <0.5% (Closed-loop)

Linearity: <±0.5%

Electrical:

Power Supply: 24VDC (18–32VDC), Static 200mA, Dynamic 350mA

Command Signal: ±10V / ±10mA (Standard)

Feedback Signal: 4–20mA (Valve Core Position LVDT)

Connection: 6+PE (EN 175201-804), Moog Inc.

Protection Grade: IP65 (Locked State)

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: 6+PE Connector, Analog Command + 24VDC Power Supply + Position Feedback Moog Inc.

Feedback: Integrated LVDT Valve Core Position Sensor (Full-Travel Closed-loop)

Installation: 4-Port ISO 4401-05 Installation (M5 Screws, 8Nm)

Oil Ports: P, A, B, T; Optional External Y Drain (T > 210bar) Core function

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

Integrated Closed-loop Electronics: On-board PID, high control accuracy and repeatability

High Dynamic Response: ≤12ms step response, suitable for high-speed and precise working conditions

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

Fault Safety Design: Valve core returns to center when power is lost / fault occurs, ensuring system safety 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 devices

Compatibility Statement

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

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

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