Product Introduction

Model: D661-2935-6

Type: Two-stage servo proportional valve, four-way, ISO 4401-05 (CETOP 05), integrated 24VDC electronics, ServoJet jet pipe pilot

Manufacturer: MOOG (Muog)

Series: D661 (High-performance closed-loop servo proportional valve series)

Description: D661-2935-6 is a high-pressure, high-flow, high-dynamic response closed-loop servo valve, integrating LVDT valve core position feedback and PID control, suitable for demanding industrial closed-loop control scenarios. Model interpretation (D661-2935-6)

D661: Series code (ISO 4401-05, integrated 24VDC electronics)

2: Flow specification code (large flow)

935: Valve core / pressure / configuration combination code

-6: Version / customization code (factory configuration, special parameters or interface variants) Technical Specifications

Part Number: D661-2935-6

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): 60L/min (±10%) Moog Inc.

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

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

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

Response Time (0→100%): ≤12ms

Hysteresis: <0.3% (Closed-loop)

Linearity: <±0.25%

Electrical:

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

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

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

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) Moog Inc.

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 Preamplifier: Anti-contamination, low leakage (< 15ml/min), long lifespan

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

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

Safety-First Design: Valve core returns to center when power is lost / system fails, 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