MOOG D661-4003 Servo Proportional Valve
May 28, 2026

MOOG D661-4003 Servo Proportional Valve

Product Overview Model: D661-4003 Type: Two-stage servo proportional valve, 4-way, ISO 4401-05 (CETOP 05), integrated 24VDC electronics, ServoJet pilot Manufacturer: MOOG Series: D661 (high‑performance closed‑loop servo proportional valve series) Description: The D661-4003 is a high‑pressure, high‑flow, fast‑response closed‑loop servo valve with integrated LVDT spool position feedback and PID control, designed for heavy‑duty industrial closed‑loop control.

Description

Model Interpretation (D661-40

Model Interpretation (D661-4003)

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

4: Flow Grade Code (High Flow)

00: Valve Core/Pressure/Configuration Base Code

3: Electrical/Feedback Variant (±10V Command, 4-20mA Feedback) Technical Specifications

Part Number: D661-4003

Valve Size: ISO 4401-05 (CETOP 05), Diameter 6mm

Control Function: Four-way Three-Position, Spring-Actuated, Zero Clearance, Closed-loop Position/Flow/Pressure Control

Rated Flow (Δp=35 Bar): 80 Liters/Minute (±10%) - Mug Company

Maximum Working Pressure (P/A/B): 350 Bar - Mug Company

Pilot Pressure: 21 - 210 Bar (Internal P or External X Supply)

T-Port Pressure: 210 Bar (Internal Y Drainage); 350 Bar (External Y Drainage) - Mug Company

Response Time (0→100%): ≤14 Milliseconds

Hysteresis: <0.3% (Closed-loop)

Linearity: <±0.25% Electrical:

Power Supply: 24 Volt DC (18 - 32 Volt DC), Static Power Consumption 200 Milliamps, Dynamic Power Consumption 350 Milliamps, Provided by Mug Company.

Command Signal: ±10 Volt (Differential, 10 KOhm Impedance) Provided by Mug Company.

Feedback Signal: 4 - 20 mA (LVDT Piston Position) Provided by Mug Company.

Connector: 6+PE (EN 175201-804), Provided by Mug Company.

Protection Grade: IP65 (Complementary Use)

Hydraulic Oil: Mineral Oil (DIN 51524), Viscosity 15 - 45 Square Millimeters/Second Temperature:

Environmental Temperature: -20°C to +60°C

Working Medium Temperature: -20°C to +80°C

Weight: Approximately 5.7 Kilograms

Seal: Standard NBR; Optional FPM (V)

Interface and Communication

Electrical Interface: 6+PE Connector; Analog Command ±10 Volt, 24 Volt DC Power Supply, Position Feedback 4-20 mA Mug Company (Mug Company)

Feedback: Integrated LVDT Eccentric Shaft Position Sensor (Full Closed-loop) Mug Company

Installation: 4-Port ISO 4401-05 Installation (M5 Screw, 8 Newton-Meters) Mug Company

Ports: P, A, B, T; Optional External Y Drainage Port (T>210 Bar) Mug Company

Main Features

Servo Injector: Anti-pollution, Low Leakage (<15 Milliliters/Minute), Long Service Life Mug Company

Integrated Closed-loop Electronic System: Built-in PID Control to Ensure High Precision and Repetitiveness Mug Company

High Dynamic Response: ≤14 Milliseconds Step Response, Suitable for High-Speed Precision Applications

Low Zero Leakage: Energy-saving Design, Suitable for Long-Term Pressurized/Standby Systems Mug Company

Fail-Safe Design: Valve Core in Safe Position When Power Supply is Lost/Fault; Customizable Safe Position Available Mug Company

Applications

Industrial Automation: High-Precision Machining, CNC Centers, Robot Hydraulic Systems Morgan Company

Test Equipment: Material Testing Machine, Fatigue Test Bench, Hydraulic Simulation Platform Morgan Company

Metallurgy: Roller Gap Control, Tension Control Morgan Company

Aerospace: Ground Simulation Equipment, Flight Test Bench Morgan Company

Compatibility

Series Compatibility: Can be Interchanged with D661 (G/C/A Type) and D662/D663 (ISO 4401-05) Models. Morgan Company. Upgrade Replacement: The old D633/D634 servo valves can be directly replaced to enhance dynamic performance. Morgan Company.

System Requirements: 24-volt DC power supply, analog controller (±10 volt input / 4-20 milliamp output), ISO 4401-05 standard interface.


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