Model Code Definition

D663 = D660 core product range, NG10 ISO4401-05 mounting dimension, ServoJet jet-pipe pilot construction, onboard amplifier + full-travel LVDT spool displacement closed-loop feedback structure

4702 = exclusive factory fixed trim number defining rated flow, amplifier gain and null offset; core configuration four-way spring-centered spool with 10% lap, standard NBR sealing material; extended suffix codes available for custom connector, special seal and drain modification.

Technical Specifications

Hydraulic Parameters

Rated Flow:295 L/min @35bar single-side differential pressure; peak instantaneous flow 438 L/min @70bar supply pressure

Max Working Pressure:P/A/B main ports up to 350bar; internal T drain ≤210bar; standalone external Y drain supports full 350bar system pressure

Full Stroke Step Response:≤26.5ms under 210bar rated supply hydraulic pressure

Control Precision:Hysteresis＜0.22%FS, Resolution＜0.075%FS, total thermal drift(-20~+80℃)＜2.35%FS

Null Leakage:0.30~2.15 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:3.42kg

Electrical Parameters

Input Supply:24VDC wide-range power input(18~32VDC), static standby current ≤780mA

Standard Control Signal:Factory preset ±10VDC differential voltage; ±10mA /4~20mA current input available via factory parameter recalibrationMoog Inc.

EMC Compliance:Conforms to EN55011 industrial EMC standard; standard 7-pin military circular connector with IP65 protection after cable installation.

Port & Connection Configuration

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

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

Core Functions

1.Patented ServoJet jet-pipe pilot owns superior anti-pollution performance compared with traditional nozzle-flapper pilot, enabling continuous stable operation under moderately contaminated hydraulic fluid environment.

2.10% positive overlap main spool optimised for high-flow steady pressure/force closed-loop regulation; onboard LVDT closed-loop dynamically compensates spool position 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 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 provides outstanding anti-interference for medium-long wiring precision closed-loop control.

Typical Application

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

Installation & Maintenance Instructions

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

2.Arrange power cables and shielded control wires inside separated wiring ducts to avoid frequency converter harmonic interference on analog control signals; fasten valve with standard flat washers per specified torque during mounting.

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

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