Model Code Definition

D664 = D660 high-flow subseries, NG25 ISO4401 mounting dimension, patented ServoJet jet-pipe pilot structure, onboard amplifier + full-range LVDT spool closed-loop feedback

4010 = Custom large-flow zero-overlap four-way metering spool with spring centering, factory pre-calibrated fixed amplifier gain and null offset parameter

No extra suffix = Standard NBR sealing, split T/Y separate drain ports, reinforced anti-vibration amplifier housing design

Technical Specifications

Hydraulic Parameters

Rated Flow:550 L/min @10.5bar single-side differential pressure; peak instantaneous flow 1416 L/min @70bar supply differential pressure

Max Working Pressure:P/A/B main control ports 350bar; internal T drain ≤210bar; external Y drain full 350bar rated pressure

100% Full Stroke Step Response:≤42ms under nominal 210bar supply hydraulic pressure

Control Accuracy:Hysteresis＜0.35%FS, Resolution＜0.095%FS, overall thermal drift(-20~+80℃)＜3.0%FS

Null Leakage:0.50~2.55 L/min based on factory zero-lap spool machining profile

Working Medium:Anti-wear mineral hydraulic oil; fluid cleanliness NAS6~7 / ISO4406 17/14/11, fluid operating temperature -20℃~+80℃

Net Weight:5.58kg

Electrical Parameters

Input Power Supply:24VDC wide input range(18~32VDC), static standby quiescent current ≤970mA

Default Control Command:Factory preset ±10VDC differential analog input; ±10mA /4~20mA current signal configurable via factory modification

Connector:Standard 11-pin circular aviation plug, IP65 protection after complete cable assembly

EMC Standard:Compliant with EN55011 industrial electromagnetic compatibility specificationMoog Inc.

Port & Connection Configuration

Hydraulic Interface:ISO4401-08 NG25 standard mounting hole layout with independent P supply port, A/B actuator control ports, separated built-in T internal drain and dedicated Y external drain; factory pre-installed original NBR mounting gasket

Electrical Interface:11-pin circular receptacle integrates 24V power supply, ±10V command signal and full-range LVDT feedback wiring; double-shielded control cable required with single-point cabinet grounding, no fieldbus communication function

Core Functions

1.Patented ServoJet jet-pipe pilot delivers superior contamination resistance versus conventional nozzle-flapper pilot, ensuring long-term stable continuous operation under moderately contaminated hydraulic medium environmentMoog Inc..

2.Large-flow customized four-way spool enables high-capacity precise closed-loop regulation of position, speed and pressure; onboard LVDT closed-loop dynamically compensates spool dimensional drift induced by wide ambient temperature fluctuation.

3.Spring-centered fail-safe neutral layout: main spool automatically returns to middle position upon power loss to cut off A/B oil passages and lock hydraulic cylinder for equipment overload safety protection.

4.Factory fixed optimized amplifier gain matched for heavy-load continuous large-flow working condition; ±10VDC analog input features outstanding anti-interference performance for long-distance wiring precision closed-loop control.

Typical Application

Large tonnage plastic injection molding machine injection & clamping servo control, medium-large metallurgical hot rolling mill roller positioning system, heavy hydraulic forging press master cylinder force closed-loop control, medium-sized aerospace component forming hydraulic test bench high-precision flow regulation.

Installation & Maintenance Instructions

1.Mount 3μm high-precision inline high-pressure filter on upstream P supply pipeline; replace filter element after first 15 working days of equipment commissioning startup.

2.Arrange power cable and shielded control wiring inside separated wiring ducts to avoid inverter harmonic interference to analog command signal; install valve with factory specified bolt tightening torque and standard flat washers.

3.Flow gain and null offset parameters are fully pre-calibrated at MOOG factory; only minor on-site potentiometer fine-tuning permitted; complete disassembly of ServoJet pilot unit and main spool assembly is strictly prohibited.

4.Plug unused spare T/Y drain ports with original factory blank plugs during spare part storage; preserve in dry dustproof warehouse to prevent NBR rubber seal ageing and subsequent oil leakage.