Model Explanation (Basic Section)

D661: Series (Integrated Electronics, 24VDC, ISO 4401-05/NG10 Installation) Moog Inc.

4636: Valve Core/Valve Body Assembly and Pilot Stage Specifications (ServoJet® Jet Tube, Standard Flow/Pressure Rating) Moog Inc. Technical Specifications

Hydraulic parameters

Rated flow rate: 75 L/min (ΔP = 35 bar)

Maximum working pressure: 350 bar (P/A/B ports); return oil T port 210 bar (internal leakage) / 350 bar (external leakage) Moog Inc.

Installation standard: ISO 4401-05 (NG10) Moog Inc.

Step response: 6.5–12 ms (0→100%, 210 bar)

Hysteresis: <0.2%; Resolution: <0.1%; Zero drift: ΔT = 55K when **<1.5%**

Electrical parameters

Power supply: 24 VDC (18–32 VDC) Moog Inc.

Control signal: ±10 V or ±10 mA Moog Inc.

Feedback signal: 4–20 mA (valve core position) Moog Inc.

Connection: 6+PE, protection IP65 Moog Inc.

Environment and physics

Working temperature: -40℃ ~ +85℃

Weight: Approximately 5.5 kg

Material: Valve body alloy steel, valve core hard alloy

Interface and communication configuration

Hydraulic interface: P/A/B/T four ports, in accordance with ISO 4401-05 Moog Inc.

Electrical interface:

Power supply: 24VDC, GND, PE

Command: ±10V/±10mA

Feedback: 4–20mA (valve core position)

Status: Valve ready, fault alarm Moog Inc. Core function

ServoJet® Jet Pipe Pre-Controller: Strong anti-contamination performance, low drift, long service life. Moog Inc.

Integrated Closed-loop Amplifier: Built-in PID, hysteresis compensation, overload protection

Valve Core Position Electrical Feedback: High precision and high linearity throughout the full stroke. Moog Inc.

High Dynamic Response: Millisecond response, suitable for high-speed closed-loop control

Low Leakage Design: Zero leakage **< 15 mL/min** Applicable scenarios

Metallurgy: Rolling mill reduction, tension control, AGC system

Test equipment: Material testing machine, vibration table, fatigue test bench

Industrial automation: Precision machine tools, injection molding machines, robots, hydraulic forming machines

Energy and heavy industry: Wind turbine pitch control, shield tunneling machines, ship rudder systems, aircraft ground testing

Use and maintenance

Installation: Horizontal / vertical installation, avoid severe vibration; oil cleanliness NAS 1638-6 grade or better

Commissioning: Power supply 24VDC, connect ±10V/±10mA instructions; observe 4–20mA position feedback, zero adjustment and gain adjustment by Moog Inc.

Maintenance: Regular inspection of oil contamination; calibrate zero point and gain every 6 months; avoid long-term high-pressure standby without instructions