Model Code Definition

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

4013 = Custom oversized zero-overlap four-way metering spool with spring centering, factory preset fixed amplifier gain and null calibration parameters

No suffix = Standard NBR elastomer seal, split T/Y separated drain ports, standard 11-pin circular aviation connector configuration。

Technical Specifications

Hydraulic Parameters

Rated Flow:720 L/min @35bar differential pressure across single spool land; peak instantaneous flow 1520 L/min @70bar supply differential pressure

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

Full Stroke Step Response:≤45ms under nominal 210bar supply hydraulic pressure

Control Precision:Hysteresis＜0.35%FS, Resolution＜0.09%FS, total thermal drift(-20~+80℃)＜3.0%FS

Null Leakage:0.6~2.8 L/min corresponding to factory zero-lap spool machining tolerance

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

Net Weight:5.65kg

Electrical Parameters

Input Power Supply:24VDC wide input range(18~32VDC), static standby current ≤990mA

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

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

EMC Compliance:Conforms to EN55011 industrial electromagnetic compatibility standardMoog Inc.

Port & Connection Configuration

Hydraulic Interface:ISO4401 NG25 standard hole layout including P supply port, A/B actuator control ports, separated built-in T internal drain and dedicated Y external drain; original NBR mounting gasket pre-installed at factory, standard external X pilot port plugged for standard non-L type pilot configuration

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 design delivers superior anti-pollution capability compared with conventional nozzle-flapper pilot, enabling stable long-term continuous operation under moderately contaminated hydraulic fluid conditionMoog Inc.。

2.Ultra-large-flow customized four-way zero-lap spool realizes high-capacity precise closed-loop regulation for position, speed and force control; onboard LVDT closed-loop dynamically compensates spool dimensional drift induced by wide-range ambient temperature variation.

3.Spring-centered fail-safe neutral structure: main spool automatically returns to middle position upon power loss to isolate A/B oil passages and lock hydraulic cylinder for mechanical overload protection.

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

Typical Application

Super-large tonnage hydraulic forging press main cylinder closed-loop force control, heavy metallurgical hot rolling mill roller high-precision positioning system, large aluminum alloy die-casting machine clamping & injection servo control, oversized hydraulic fatigue test bench flow adjustment, marine heavy-duty hydraulic loading test system with mineral hydraulic medium.

Installation & Maintenance Instructions

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

2.Arrange power cable and shielded control wire inside separated wiring troughs to avoid inverter harmonic interference to analog control signal; mount 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; full disassembly of ServoJet pilot and main spool assembly is strictly prohibited.

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