Model Definition

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

6532E = Spool/sleeve assembly; rated flow 45 L/min @ ΔP=35 bar (high‑response linear trim, with LVDT, standard null, E‑code configuration)

Typical full config example: G45J0CA6VSX2HA

G45 = 45 L/min rated flow & high frequency response

J0CA = Standard hydraulic layout, 24 VDC, ±10 V/±10 mA command, centered null

6 = 6+PE connector, IP65

VSX2 = NBR seals, wide temperature range, standard pilot

HA = Fail‑safe centering, with LVDT

Technical Specifications

Hydraulic Parameters

Rated flow: 45 L/min (ΔP=35 bar)

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

Step response: 8–12 ms (0→100%, 210 bar)

Hysteresis: <0.10%

Resolution: <0.05%

Null drift: <1.3% (ΔT=55 K)

Null leakage: <9 mL/min

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

Electrical Parameters

Power supply: 24 VDC (18–32 VDC)

Control signal: ±10 V (differential) or ±10 mA

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

Connector: 6+PE, IP65

Current draw: ≤700 mA

Physical & Environmental

Operating temperature: −40 ℃ to +85 ℃

Weight: approx. 5.5 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 mA

Feedback: LVDT position signal

Status: Fault alarm output

Core Functions

High‑Response ServoJet® Pilot: Optimized for 45 L/min, fast dynamic response, excellent dirt tolerance

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

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

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

45 L/min Medium Flow Dynamics: Tuned for systems requiring balanced speed and accuracy

Application Scenarios

Industrial automation: Medium‑sized CNC machines, precision hydraulic presses, injection molding equipment

Test equipment: Structural fatigue testers, vibration tables, actuator test benches

Metallurgy: Precision tension control, medium‑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 cleanliness

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