Model Code Definition

D663 = D660 core series, NG10 ISO4401-05 installation dimension, ServoJet jet-pipe pilot structure, onboard amplifier + full-stroke LVDT spool displacement closed-loop feedback design

4705 = exclusive factory fixed trim code defining rated flow, amplifier gain and null offset; base configuration four-way spring-centered spool with 10% positive overlap, standard NBR sealing material; optional suffix codes for customized connector, special fluorine seal and drain structure modification

Technical Specifications

Hydraulic Parameters

Rated Flow:312 L/min @35bar single-side differential pressure; peak instantaneous flow 455 L/min @70bar supply differential pressure

Max Working Pressure:P/A/B main control ports up to 350bar; internal T drain ≤210bar; standalone external Y drain withstand full 350bar system pressureMoog Inc.

Full Stroke Step Response:≤27.2ms under 210bar rated supply hydraulic pressureMoog Inc.

Control Precision:Hysteresis＜0.23%FS, Resolution＜0.080%FS, overall thermal drift(-20~+80℃)＜2.40%FS

Null Leakage:0.32~2.28 L/min, 10% positive overlap metering spool design

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

Net Weight:3.45kg

Electrical Parameters

Input Power Supply:24VDC wide-range input(18~32VDC), static standby current ≤790mA

Standard Control Command:Factory preset ±10VDC differential voltage input; ±10mA /4~20mA current signal configurable via factory parameter recalibration

EMC Compliance:Meet EN55011 industrial EMC standard; standard 7-pin military circular connector with IP65 protection after complete cable assembly

Port & Connection Configuration

Hydraulic Interface:ISO4401-05 NG10 standard hole layout including independent P supply port, A/B actuator control ports, separated internal T drain and standalone external Y drain, factory pre-installed NBR sealing gaskets for mounting surface

Electrical Interface:7-pin circular receptacle integrating 24V power supply, ±10VDC control command and full-stroke LVDT spool feedback signal; double-shielded control cable required with single-point cabinet grounding, no digital fieldbus communication interface

Core Functions

1.Patented ServoJet jet-pipe pilot features superior anti-contamination capacity versus conventional nozzle-flapper pilot, enabling long-term stable operation under moderately contaminated hydraulic fluid environment.

2.10% positive overlap main spool optimized for high-flow steady pressure/force closed-loop regulation; onboard LVDT closed-loop dynamically compensates spool position drift induced by wide-range ambient temperature fluctuation.

3.Spring-centered fail-safe neutral design: main spool automatically returns to center upon power loss to block A/B oil passage and lock hydraulic cylinder for equipment overload safety protection.

4.Factory fixed amplifier gain tailored for high-flow heavy-load variable working condition; ±10VDC analog input delivers excellent anti-interference for medium-long wiring precision closed-loop control.

Typical Application

Metallurgical hot rolling mill hydraulic actuator positioning control, large-tonnage hydraulic forging press master cylinder force closed-loop control, heavy-duty material fatigue test bench hydraulic system, oversized die-casting machine mold clamping & injection high-flow precision control, large composite hot-forming hydraulic equipment.

Installation & Maintenance Instructions

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

2.Arrange power cable and shielded control wire inside separated wiring ducts to avoid inverter harmonic interference on analog control signal; fasten valve with standard flat mounting washers per factory specified torque during installation.

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

4.Seal all unused hydraulic ports with original blank plugs for spare part storage; preserve in dry dustproof warehouse to prevent NBR seal ageing and hydraulic oil leakage.