Model Code Definition

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

Z = Factory non-standard preset for spool metering characteristic and zero drift fine calibration

4323 = Exclusive trim number: four-way spring-centered spool with 10% positive overlap linear flow output, fixed amplifier gain setting

K = High-temperature fluorocarbon composite sealing, anti-shock internal amplifier layout, split independent T/Y dual drain design for high temperature stability

Technical Specifications

Hydraulic Parameters

Rated Flow:285 L/min @35bar single-side differential pressure; peak instantaneous flow 412 L/min @70bar supply differential pressure

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

Full Stroke Step Response:≤27.0ms under standard 210bar supply pressureMoog Inc.

Control Precision:Hysteresis＜0.23%FS, Resolution＜0.072%FS, overall thermal drift(-20~+80℃)＜2.3%FS

Null Leakage:0.37~2.02 L/min derived from 10% positive overlap spool construction

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

Net Weight:3.60kg

Electrical Parameters

Power Supply:24VDC wide input range(18~32VDC), static standby current ≤805mA

Default Control Input:Factory pre-set ±10VDC differential analog signal; ±10mA /4~20mA available via factory re-calibration

Connector:Standard 7-pin circular military aviation plug, IP65 protection after cable assembly

EMC:Compliant with EN55011 industrial electromagnetic compatibility specification

Port & Connection Configuration

Hydraulic Interface:ISO4401-05 NG10 standard mounting hole layout, independent P supply port, A/B actuator control ports, separated built-in T drain and dedicated external Y drain; factory pre-installed fluorocarbon mounting gasket matching K high-temperature sealing requirement

Electrical Interface:7-pin circular receptacle integrates 24V power supply, ±10V control command and full-stroke 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 delivers superior contamination immunity versus traditional nozzle-flapper pilot, enabling stable continuous operation under moderately contaminated hydraulic oil environment.

2.10% positive overlap four-way spool realizes stable medium-high flow pressure/force closed-loop regulation; onboard LVDT closed-loop dynamically compensates spool thermal displacement drift, K configuration further suppress long-term zero shift under wide ambient temperature fluctuation during continuous heavy-load operation.

3.Spring return centered fail-safe structure: main spool automatically returns neutral upon power failure to block A/B oil paths and lock hydraulic actuator for equipment overload protection.

4.Factory fixed amplifier gain optimized for medium-high flow heavy-duty working condition; ±10VDC analog input features outstanding anti-interference performance for medium-distance precision closed-loop control wiring.

Typical Application

Medium & large tonnage forging press master cylinder closed-loop force control, metallurgical hot rolling mill hydraulic cylinder high-precision positioning, heavy-duty material fatigue test bench hydraulic drive system, large-size die-casting machine clamping & injection closed-loop control, aviation composite material hot-forming hydraulic servo control equipment.

Installation & Maintenance Instructions

1.Mount 3μm high-precision inline filter on main P supply pipeline; replace original filter element after 15 working days of equipment commissioning startup.

2.Arrange power cable and shielded control wire inside separate wiring ducts to avoid frequency converter harmonic interference on analog control signal; install valve with specified tightening torque and standard flat washers.

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

4.Plug unused T/Y spare hydraulic ports with original factory blank plugs for spare inventory; store in dry dustproof warehouse to avoid fluorocarbon seal ageing and oil leakage.