MOOG D664-Z4309N Servo Valve
Product Overview
D664-Z4309N belongs to MOOG D660 ServoJet two-stage high-flow servo valve family with ISO4401 NG25 Size08 mounting standard, built-in integrated analog drive amplifier + full-stroke LVDT spool closed-loop feedback without external driver moduleMoog Inc.. Z stands for factory customized spool flow characteristic and matched onboard amplifier parameter calibration; 4309 is pre-calibrated zero-lap four-way spring-centered spool trim with fixed flow gain; N denotes customized sealing material + internal drain structure modification. Equipped with jet-pipe pilot for outstanding anti-contamination capability, separated internal T drain and independent external Y drain layout, mainly designed for heavy-load hydraulic press, metallurgical auxiliary servo cylinder closed-loop position & force controlMoog Inc.
Description
Model Code Definition
D664：D660 large-flow NG25 subseries, two-stage ServoJet jet-pipe pilot, onboard amplifier + full-range LVDT spool closed feedback, ISO4401-08 installation dimensionMoog Inc.Z：Non-standard customized spool profile, factory bench calibrated flow curve and matched amplifier setting4309：Zero-overlap four-way spring-centred main spool, fixed null overlap, preset flow gain and neutral offset parameterN：Custom composite sealing formulation + optimized drain passage layout, medium temperature adaption from -25℃~+85℃, non-standard OEM sealing configuration
Technical Specifications
Hydraulic Parameters
Rated Flow：410 L/min under 35bar single-side differential pressure; peak instantaneous flow 1350 L/min at 70bar supply differential pressureMax Working Pressure：P/A/B main ports up to 350bar; internal T drain ≤210bar; external independent Y drain rated full 350barFull Stroke Step Response：≤29ms under nominal 210bar supply oil pressureControl Precision：Hysteresis＜0.23%FS, Resolution＜0.065%FS, overall thermal drift＜2.1%FS within rated working temperature rangeNull Leakage：0.22~1.70 L/min subject to original spool machining toleranceWorking Medium：Anti-wear mineral hydraulic oil, fluid cleanliness NAS6~7 / ISO4406 17/14/11, operating oil temperature -25℃~+85℃Net Weight：5.85kg
Electrical Parameters
Input Power：24VDC wide-range power supply (18~32VDC), static standby quiescent current ≤870mADefault Control Signal：Factory standard ±10VDC differential analog input; optional ±10mA / 4~20mA current control signal per special orderConnector：Standard 11-pin circular shielded aviation plug with IP65 protection grade, EMC EN55011 certification
Port & Connection Configuration
Hydraulic Interface：Standard ISO4401 NG25 P/A/B/T/Y port layout; standard external X pilot port reserved and available for optional external pilot oil feeding; N customized composite mounting gasket pre-assembled; split T/Y independent drain design, all unused drain ports equipped with original factory sealing plugsElectrical Interface：Built-in socket integrates 24V power supply, analog command signal and full-travel LVDT feedback wiring; double-shielded control cable required with single-point grounding at control cabinet, no fieldbus communication function
Core Functions
1.Patented ServoJet jet-pipe pilot structure features superior dirt resistance compared to conventional nozzle-flapper pilot, stable continuous operation under moderately polluted hydraulic fluid of industrial heavy-duty workshopMoog Inc.。2.Z custom spool paired with N modified sealing structure effectively suppress zero drift under fluctuating ambient temperature; zero-lap four-way spool achieves high-precision closed-loop position, speed and clamping force control for hydraulic actuator。3.Spring-centered fail-safe neutral structure: main spool automatically returns to middle position upon power failure to block A/B oil paths and lock hydraulic cylinder, avoiding unexpected equipment runaway damage。4.N customized sealing improves medium compatibility for general industrial hydraulic oil, prevents seal ageing and oil leakage under long-period cyclic load operation。
Typical Application
Heavy hydraulic forging press master cylinder control, steel plant auxiliary hydraulic servo system, medium-load extrusion forming equipment, general industrial high-precision hydraulic fatigue test bench, non-ferrous metal continuous processing hydraulic servo control。
Installation & Maintenance Instructions
1.Mount 3μm high-precision high-pressure inline filter on upstream P supply pipeline; replace filter cartridge after first 15 working days of commissioning startup。2.Power cable and control shielded wire must be laid in separated wiring trunking to avoid frequency converter harmonic interference; fasten valve with factory specified bolt torque matching ISO08 installation standard。3.All flow gain, null offset and amplifier parameters are pre-calibrated at MOOG factory; only minor on-site potentiometer fine adjustment is permitted; complete disassembly of ServoJet pilot and main spool assembly is strictly forbidden, internal circuit modification prohibited。4.N customized composite seal cannot be replaced with standard NBR or common FKM seal; during spare part storage, seal all idle T/Y drain ports with original plugs and store in dry dustproof warehouse。
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