Model Definition

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

• 5001 = Spool/sleeve assembly; rated flow 250 L/min @ ΔP=35 bar (max‑flow, enhanced linearity trim)

• Typical full config example: P250HAAM7NSX2‑F

  • P250 = 250 L/min rated flow & high frequency response

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

  • 7 = 7+PE connector, IP65

  • NSX2 = NBR seals, wide temp range, LVDT 4–20 mA feedback

  • F = Enhanced linearity ServoJet® pilot stage

Technical Specifications

Hydraulic Parameters

• Rated flow: 250 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: 16–19 ms (0→100%, 210 bar)

• Hysteresis: <0.18%

• Resolution: <0.09%

• Null drift: <1.9% (ΔT=55 K)

• Null leakage: <30 mL/min

• Fluid cleanliness: NAS 1638 Class 6 / ISO 4406 18/15

Electrical Parameters

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

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

• Feedback signal: 4–20 mA (LVDT spool position)

• Connector: 7+PE, IP65

• Current draw: ≤980 mA

Physical & Environmental

• Operating temperature: −40 ℃ to +85 ℃

• Weight: approx. 11.5 kg

Interface & Communication Configuration

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

• Electrical interface:

  • Power: 24 VDC, GND, PE

  • Command: ±10 V / ±10 mAMoog Inc.

  • Feedback: 4–20 mA (spool position)

  • Status: Fault alarm output

Core Functions

• Enhanced Max‑Flow ServoJet® Pilot: Optimized for 250 L/min, improved linearity, robust contamination resistance

• Integrated PID Amplifier: Onboard dead‑zone compensation, thermal/overload protection

• LVDT Closed‑Loop Feedback: High linearity and repeatability across full stroke

• Fail‑Safe Centering: Spool returns to neutral on power loss

• 250 L/min High‑Flow Stability: Tuned for large‑scale hydraulic systems with steady high‑flow demand

Application Scenarios

• Metallurgy: Heavy plate mill AGC roll gap control, high‑force continuous tension control

• Test equipment: Large‑scale structural fatigue testers, high‑load vibration simulation tables, heavy actuator test benches

• Industrial automation: Super‑large CNC machine tools, 1000‑ton+ hydraulic presses, large injection molding machines

• Energy & heavy industry: High‑power wind turbine pitch control, marine main hydraulic systems, steel mill main drive control

Usage & Maintenance

• Installation: Horizontal/vertical mounting; avoid severe vibration/shock

• Fluid: ISO VG46 mineral oil; maintain cleanliness per NAS 1638 Class 6

• Commissioning: Apply 24 VDC power; connect ±10 V/±10 mA command; calibrate zero/gain via 4–20 mA feedback

• Maintenance: Inspect fluid contamination every 3 months; calibrate zero/gain every 6 months; avoid long idle periods at high pressure