Model Code Definition

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

4025 = exclusive factory fixed trim number with pre-calibrated rated flow, fixed amplifier gain and null offset; bare model uses zero-lap four-way spring-centered spool with standard NBR seal; complete full model extends suffix codes for customized connector, sealing material and drain configurationMoog Inc..

Technical Specifications

Hydraulic Parameters

Rated Flow:138 L/min @35bar single-side differential pressure; peak instantaneous flow 207 L/min @70bar supply pressure

Max Working Pressure:P/A/B main ports up to 350bar; internal T drain ≤50bar; external Y drain withstand full 350bar system pressureMoog Inc.

Full Stroke Step Response:≤20.5ms under 210bar rated supply pressure

Control Precision:Hysteresis＜0.17%FS, Resolution＜0.062%FS, overall thermal drift(-20~+80℃)＜2.08%FS

Null Leakage:0.20~1.72 L/min, critical zero-overlap linear metering spool

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

Net Weight:3.22kg

Electrical Parameters

Input Supply:24VDC wide-range input(18~32VDC), static standby current ≤710mA

Standard Control Signal:Factory preset ±10VDC differential voltage; 4~20mA current input available via factory recalibration

EMC Standard:Compliant with EN55011 industrial EMC; standard 7-pin military circular connector with IP65 protection after cable installationMoog Inc..

Port & Connection Configuration

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

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

Core Functions

1.Patented ServoJet jet-pipe pilot owns superior anti-contamination ability compared with traditional nozzle-flapper pilot, ensuring long-term stable continuous operation under moderately contaminated hydraulic oil environment.

2.Zero-lap linear spool enables seamless switching among position, speed and pressure triple closed-loop control; built-in LVDT closed-loop dynamically compensates spool drift caused by wide-range ambient temperature fluctuation.

3.Spring-centered fail-safe neutral construction: main spool automatically returns to middle position upon power failure to lock A/B oil path and fix hydraulic cylinder for overload safety protection.

4.Factory fixed amplifier gain matched for medium-flow variable-load working condition; ±10VDC analog input delivers excellent anti-interference performance for medium-distance wiring high-precision regulation.

Typical Application

Medium tonnage hydraulic press servo cylinder closed-loop control, metal component tensile & fatigue test bench hydraulic system, medium-size die-casting machine injection and mold clamping precision control, medium-sized composite hot-pressing 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 to analog control signals; fix valve with standard flat washers during mounting.

3.Flow gain and null bias parameters are fully pre-calibrated at MOOG factory; only slight on-site potentiometer fine-tuning is allowed; 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 stock; store in dry dustproof warehouse to prevent NBR seal ageing and oil leakage.