Model Definition

D661 = Series (integrated 24 VDC electronics, NG10 mounting)

G35 = 35 L/min rated flow @ ΔP=35 bar, high‑response linear trim

JOAA = Standard hydraulic layout, 24 VDC, ±10 V/±10 mA command, centered null

4 = 4‑pin connector, IP65

NSX2 = NBR seals, standard temperature range, standard pilot

HA = Fail‑safe centering, with LVDT

Technical Specifications

Hydraulic Parameters

Rated flow: 35 L/min (ΔP=35 bar)

Max working pressure: 350 bar (P/A/B); 210 bar (internal drain T) / 350 bar (external drain T)Moog Inc.

Step response: 7–10 ms (0→100%, 210 bar)

Hysteresis: <0.10%Moog Inc.

Resolution: <0.05%Moog Inc.

Null drift: <1.2% (ΔT=55 K)

Null leakage: <8 mL/min

Fluid cleanliness: NAS 1638 Class 6 / ISO 4406 18/15Moog Inc.

Electrical Parameters

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

Control signal: ±10 V (differential) or ±10 mAMoog Inc.

Feedback: Integrated LVDT (closed‑loop spool position control)Moog Inc.

Connector: 4‑pin, IP65Moog Inc.

Current draw: ≤650 mA

Physical & Environmental

Operating temperature: −20 ℃ to +80 ℃

Weight: approx. 5.3 kg

Interface & Communication Configuration

Hydraulic interface: P/A/B/T, ISO 4401‑05 (NG10)

Electrical interface:

Power: 24 VDC, GND

Command: ±10 V / ±10 mA

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

Status: Fault alarm output

Core Functions

High‑Response ServoJet® Pilot: Optimized for 35 L/min, fast dynamic response, excellent dirt toleranceMoog Inc.

Integrated PID Amplifier: Onboard dead‑zone compensation, thermal/overload protection, stable nullMoog Inc.

Closed‑Loop Precision Control: LVDT feedback for accurate spool position control, high linearity and repeatabilityMoog Inc.

Fail‑Safe Centering: Spool returns to neutral on power lossMoog Inc.

35 L/min Medium‑Low Flow Dynamics: Tuned for systems requiring high accuracy and moderate speed

Application Scenarios

Industrial automation: Small CNC machines, precision hydraulic presses, injection molding equipment

Test equipment: Component fatigue testers, vibration tables, small actuator test benches

Metallurgy: Precision tension control, light‑duty AGC roll gap control

Energy: Wind turbine pitch control, marine auxiliary hydraulics

Usage & Maintenance

Installation: Horizontal/vertical mounting; minimize vibration

Fluid: ISO VG46 mineral oil; maintain NAS 1638 Class 6 cleanlinessMoog Inc.

Commissioning: Apply 24 VDC; connect ±10 V/±10 mA command; calibrate zero/gain and LVDT feedback

Maintenance: Check contamination every 3 months; calibrate every 6 months; avoid long idle periods at high pressure