Model Code Definition

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

4009 = Custom ultra-high flow zero overlap four-way spool, spring centered, factory preset fixed gain & null calibration

L05 = Internal pilot oil supply, pilot oil taken from main P port (no external X pilot oil port required), standard body casting dimension 05 specification

H = Max rated working pressure up to 350bar main port rating

AB = Spool spring centering + standard four-way flow configuration, no offset fail-spring

F6 = FKM fluorocarbon rubber sealing (instead of standard NBR), suitable for phosphate ester / synthetic hydraulic fluid, wide temperature resistance -40℃~+120℃

VSX2 = 11-pin military circular plug, double-shield wiring specification, analog ±10VDC default input, standard EMC filter layout

-A = Factory original calibrated batch code, standard neutral null setting without special offset modification

Technical Specifications

Hydraulic Parameters

Rated Flow:660 L/min @35bar differential pressure; peak instantaneous flow 890 L/min @70bar supply differential pressure

Max Working Pressure:P/A/B ports 350bar; internal T drain ≤210bar; external independent Y drain full 350bar rating

Full Stroke Step Response:≤44ms under 210bar nominal supply pressure

Control Precision:Hysteresis＜0.32%FS, Resolution＜0.092%FS, total thermal drift(-20~+80℃)＜2.9%FS

Null Leakage:0.55~2.70 L/min (zero-lap customized spool)

Working Medium:Mineral oil / phosphate ester synthetic hydraulic oil; fluid cleanliness NAS6~7 / ISO4406 17/14/11; working fluid temp -40℃~+120℃ (FKM seal upgrade)

Net Weight:5.62kg

Electrical Parameters

Power Input:24VDC wide range(18~32VDC), static standby current ≤980mA

Default Control Signal:±10VDC differential analog input; 4~20mA / ±10mA available per factory modification

Connector:11-pin circular aviation socket VSX2 standard, IP65 with complete shielded cable assembly

EMC Compliance:EN55011 industrial electromagnetic standard

Port & Connection Configuration

Hydraulic Interface:ISO4401 NG25 standard hole layout; P supply, A/B actuator control ports, separated internal T drain + independent external Y drain; L05=internal pilot feed (X port plugged & unused); original FKM mounting gasket pre-installed

Electrical Interface:VSX2 11pin circular connector integrates 24V power, ±10V command signal, full-stroke LVDT feedback; double shielded control cable required with single-point cabinet grounding, no digital fieldbus function

Core Functions

1.Patented ServoJet jet-pipe pilot structure improves anti-contamination performance vs traditional nozzle-flapper pilot, stable continuous operation under moderate oil contamination condition; L05 internal pilot design simplifies external pipeline layout without separate pilot pressure source.

2.Ultra-large flow zero-lap customized four-way spool realizes high-capacity precise closed-loop regulation of position, force and pressure; onboard LVDT closed-loop dynamically compensates spool thermal expansion drift in wide ambient temperature range.

3.Spring-centered fail-safe neutral design: spool auto returns to center upon power loss to lock A/B oil circuits and fix hydraulic cylinder for equipment overload protection.

4.FKM fluorine seal upgrade adapts special non-mineral hydraulic medium for aerospace/chemical working condition; factory fixed amplifier gain optimized for long-term heavy-load continuous running.

Typical Application

Ultra-large tonnage forging press master cylinder closed-loop force control, metallurgical heavy hot rolling mill roller precision positioning, aerospace structural part hot-forming hydraulic test bench, large aluminum alloy die-casting clamping/injection servo control, marine heavy-duty hydraulic loading test system with synthetic hydraulic oil medium.

Installation & Maintenance Instructions

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

2.Separate power cable and shielded control wire in different wiring troughs to avoid inverter harmonic interference; mount valve with factory specified bolt torque and standard flat washers.

3.Flow gain and null offset fully pre-calibrated at MOOG factory; only slight potentiometer fine-tuning permitted onsite; full disassembly of ServoJet pilot and main spool assembly is strictly forbidden.

4.FKM seal variant shall avoid long-term contact with inferior hydraulic medium; block unused X pilot port with original plug during spare storage, store in dry dustproof warehouse to prevent seal ageing.