Model Definition

D661: Series with integrated electronics, 24 VDC power supply and NG10 installation dimension

4652: Spool and sleeve assembly, rated flow 75 L/min at 35 bar pressure drop

G15JOAA6VSX2HA: Full configuration code

G: Standard spool equipped with ServoJet® pilot stage

15: Frequency response class with bandwidth up to 60 Hz

J: 24 VDC power supply, compatible with ±10 V or ±10 mA analog control signal

O: Centered null position with fail-safe function

AA: Standard hydraulic and electrical base configuration

6: 6+PE electrical connector with IP65 protection grade

VS: Special sealing material suitable for wide temperature range

X2HA: LVDT spool position feedback with 4-20 mA output and standard performance parameters

Technical Specifications

Hydraulic Parameters

Rated flow: 75 L/min (ΔP=35 bar)

Maximum operating pressure: 350 bar for port P, A and B; 210 bar for internal drain port T, 350 bar for external drain port T

Step response: 6.5-10 ms (0 to 100% stroke under 210 bar)

Hysteresis: Less than 0.2%

Resolution: Less than 0.1%

Temperature drift: Less than 1.5% (ΔT=55 K)

Null leakage: Less than 10 mL/min

Recommended fluid cleanliness: NAS 1638 Class 6 or ISO 4406 18/15

Electrical Parameters

Power supply: 24 VDC (18-32 VDC)

Control signal: ±10 V or ±10 mA

Feedback signal: 4-20 mA from LVDT spool position sensor

Electrical connector: 6+PE, IP65

Working current: Maximum 350 mA

Physical & Environmental Parameters

Operating temperature: -40 ℃ to +85 ℃

Weight: Approximately 8.0 kg

Interface & Communication Configuration

Hydraulic interface: Four ports P, A, B, T complying with ISO 4401-05 standard

Electrical interface: Terminals for 24 VDC power, GND and PE; terminals for ±10 V/±10 mA command signal; 4-20 mA position feedback terminals and fault status output terminals

Core Functions

ServoJet® pilot stage delivers strong anti-pollution capability, low null drift and long service life

Integrated closed-loop amplifier supports PID regulation, dead zone compensation and overload protection

LVDT position feedback guarantees excellent linearity and positioning accuracy throughout the full stroke

Fail-safe design enables the spool to return to neutral position automatically when power is disconnected

Stable 60 Hz bandwidth satisfies the dynamic control demands of general industrial equipment

Application Scenarios

Metallurgical industry: Large flow AGC roll gap control and tension control systems

Testing equipment: Dynamic material testing machines, fatigue test benches and medium frequency vibration tables

Industrial automation: Large precision machine tools, high-speed injection molding machines and hydraulic forming equipment

Energy and heavy industry: Wind turbine pitch control, main control of shield machines and marine hydraulic systems

Usage & Maintenance

Mount the valve horizontally or vertically and keep it away from severe vibration

Adopt qualified hydraulic oil and maintain fluid cleanliness above NAS 1638 Class 6

Supply 24 VDC power and access ±10 V or ±10 mA command signal during commissioning, then complete zero adjustment and gain calibration according to 4-20 mA feedback signal

Check hydraulic fluid contamination regularly. Calibrate null position and gain every six months. Avoid long-term high-pressure standby without control command.