MOOG D661-4033 Servo‑Proportional Valve_Ningde Androld Automation Equipment Co.,Ltd.

May 28, 2026

MOOG D661-4033 Servo‑Proportional Valve

Product Overview Model: D661-4033 Type: Two‑stage servo‑proportional valve, 4‑way, ISO 4401‑05 (CETOP 05), integrated 24 VDC electronics, ServoJet pilot Manufacturer: MOOG Series: D661 (High‑performance closed‑loop servo‑proportional valve series) Description: The D661-4033 is a high‑pressure, high‑flow, high‑dynamic‑response closed‑loop servovalve with integrated LVDT spool position feedback and PID control, designed for demanding industrial closed‑loop control applications.

Description

Model Code Explanation (D661-4033)

D661: Series code (ISO 4401‑05, integrated 24 VDC electronics)
4: Flow rating code (high flow)
03: Spool/pressure/configuration combination code
3: Electrical/feedback variant (command ±10 V; feedback 4–20 mA)Moog Inc.

Technical Specifications

Part Number: D661-4033

Valve Size: ISO 4401‑05 (CETOP 05), port diameter Ø6 mm

Control Function: 4‑way/3‑position, spring‑centered, zero‑lap, closed‑loop position/flow/pressure control

Nominal Flow (Δp = 35 bar): 80 L/min (±10%)

Max Operating Pressure (P/A/B): 350 barMoog Inc.

Pilot Pressure: 21–210 bar (internal P or external X supply)Moog Inc.

T Port Pressure: 210 bar (internal Y return); 350 bar (external Y return)Moog Inc.

Step Response Time (0→100%): ≤12 msMoog Inc.

Hysteresis: <0.2% (closed‑loop)

Linearity: <±0.25%

Resolution: <0.1%

Electrical

Supply: 24 VDC (18–32 VDC), quiescent 200 mA, dynamic 350 mAMoog Inc.
Command Signal: ±10 V (differential, 10 kΩ impedance)Moog Inc.
Feedback Signal: 4–20 mA (LVDT spool position)Moog Inc.
Connector: 6+PE (EN 175201‑804)Moog Inc.
Protection Class: IP65 (connected)

Hydraulic

Fluid: Mineral oil (DIN 51524), viscosity 15–45 mm²/sMoog Inc.
Temperature:
- Ambient: −20°C to +60°CMoog Inc.
- Fluid: −20°C to +80°CMoog Inc.
Weight: Approx. 5.7 kg
Seals: Standard NBR; optional FPM (fluorocarbon rubber)Moog Inc.

Interface & Communication

Electrical Interface: 6+PE connector; analog command ±10 V, 24 VDC supply, position feedback 4–20 mAMoog Inc.

Feedback: Integrated LVDT spool position sensor (full‑stroke closed‑loop)Moog Inc.

Mounting: 4‑hole ISO 4401‑05 mounting (M5 screws, torque 8 Nm)

Ports: P, A, B, T; optional external Y return (T > 210 bar)Moog Inc.

Key Features

ServoJet Pilot: Contamination‑resistant, low leakage (<15 ml/min), long service life
Integrated Closed‑Loop Electronics: On‑board PID, high accuracy and repeatability
High Dynamic Response: ≤12 ms step response for high‑speed, high‑precision applicationsMoog Inc.
Low Null Leakage: Energy‑efficient, suitable for long‑term pressure‑holding/standby systems
Fail‑Safe Design: Spool centers on power loss/fault; custom safe position availableMoog Inc.

Applications

Industrial Automation: High‑precision machine tools, CNC centers, robotic hydraulic systems
Test Equipment: Material testing machines, fatigue test benches, hydraulic simulation platforms
Metallurgy: Roll gap control, tension control systems
Aerospace: Ground simulation equipment, flight test benches

Compatibility

Series Compatibility: Interchangeable with D661 (G/C/A types), D662/D663 (ISO 4401‑05)
Upgrade Replacement: Direct drop‑in for older D633/D634 servovalves for improved dynamic performance
System Requirements: 24 VDC supply, analog controller (±10 V input/4–20 mA output), ISO 4401‑05 standard manifold

Contact Info