Model Code Definition

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

4009 = Custom ultra-high flow spool trim number, spring-centered four-way zero overlap metering spool, factory preset fixed amplifier gain and null offset calibration parameters

No extra suffix = Standard NBR sealing, dual separated T/Y drain ports, anti-vibration reinforced amplifier housing designMoog Inc.

Technical Specifications

Hydraulic Parameters

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

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

100% Full Stroke Step Response:≤44ms under nominal 210bar supply hydraulic pressure

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

Null Leakage:0.55~2.70 L/min subject to factory customized spool overlap profile

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

Net Weight:5.60kg

Electrical Parameters

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

Default Control Command:Factory pre-calibrated ±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 fitting

EMC Standard:Compliant with EN55011 industrial electromagnetic compatibility regulation

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 functionMoog Inc.

Core Functions

1.Patented ServoJet jet-pipe pilot delivers outstanding contamination resistance over traditional nozzle-flapper pilot, ensuring long-term stable continuous operation under moderately contaminated hydraulic medium condition.

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

3.Spring-centered fail-safe neutral configuration: main spool automatically returns to center upon power failure to block A/B oil paths and lock hydraulic cylinder for overload safety protection of host equipment.

4.Factory optimized fixed amplifier gain for continuous heavy-load large-flow working condition; ±10VDC analog input provides superior anti-interference performance for long-distance wiring precision closed-loop controlMoog Inc..

Typical Application

Extra-large tonnage hydraulic forging press main cylinder closed-loop force control, heavy metallurgical hot rolling mill roller high-precision positioning servo system, large aerospace component forming hydraulic test bench, super-large aluminum die-casting machine clamping & injection servo drive, marine heavy-duty hydraulic loading test bench high-flow precision control.

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 separate 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 for spare part storage; keep stock in dry dustproof warehouse to prevent NBR rubber seal aging and subsequent oil leakage.