Model Code Definition

D664 = NG25 ISO4401 mounting size, ServoJet jet-pipe pilot structure, built-in amplifier + full-travel LVDT closed-loop spool feedback, large-flow D660 sub-series

Z = Custom factory calibrated special spool variant, modified internal amplifier parameter setting vs standard D664 base model

4306 = Factory pre-set zero-overlap four-way spring-centered metering spool with exclusive optimized flow gain, null position fully calibrated at MOOG factory, modified amplifier circuit matching customized spool characteristic

Technical Specifications

Hydraulic Parameters

Rated Flow:395 L/min @35bar single-land differential pressure; peak instantaneous flow 1310 L/min @70bar supply differential pressure

Max Working Pressure:P/A/B main ports up to 350bar; built-in T internal drain ≤210bar; external Y drain rated full 350bar working pressure

Full Stroke Step Response:≤27.5ms under nominal 210bar supply oil pressure

Control Precision:Hysteresis＜0.22%FS, Resolution＜0.062%FS, overall thermal drift(-20~+80℃)＜1.95%FS after factory customized gain calibration

Null Leakage:0.20~1.65 L/min subject to original spool machining tolerance

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

Net Weight:5.80kg

Electrical Parameters

Input Power Supply:24VDC wide input range(18~32VDC), static standby current ≤860mA

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

Connector:11-pin circular aviation receptacle, IP65 protection after complete cable assembly

EMC Compliance:Conforms to EN55011 industrial electromagnetic compatibility standard

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; pre-mounted original NBR mounting gasket, unused X pilot port sealed with factory blank plug for non-external pilot oil application

Electrical Interface:11-pin circular socket integrates 24V power supply, customized ±10V command signal and full-travel 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 owns superior dirt tolerance over conventional nozzle-flapper pilot, guarantees continuous stable operation under medium-impurity hydraulic fluid in harsh industrial metallurgical sites and test laboratoriesMoog Inc.。

2.Z+4306 customized spool flow gain matches medium-large flow high-precision closed-loop control demand; four-way zero-lap spool realizes precise position/speed/force closed-loop regulation for hot rolling mill AGC gap control and heavy hydraulic forging cylinder; onboard LVDT automatically compensates temperature-induced spool zero drift.

3.Spring-centered fail-safe neutral design: main spool automatically returns to middle position upon power loss to block A/B oil passage and lock hydraulic actuator to avoid unexpected equipment runaway damage.

4.Factory pre-calibrated customized built-in amplifier features strong anti-interference performance to adapt long-distance analog wiring under severe industrial electromagnetic environment.

Typical Application

Hot & cold rolling mill AGC roll gap closed-loop servo regulation, medium-tonnage hydraulic forging press master cylinder flow control, medium-size hydraulic component fatigue test bench, aluminum alloy extrusion forming equipment, ship hydraulic servo test system.

Installation & Maintenance Instructions

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

2.Arrange power cable and shielded control wire inside separated wiring ducts to avoid inverter harmonic interference to analog control signal; fix valve with factory specified bolt tightening torque and standard flat washers.

3.Flow gain and null offset parameters of customized Z4306 version are fully preset at MOOG factory; only minor on-site potentiometer fine-tuning is permitted; complete disassembly of ServoJet pilot assembly and main spool unit is strictly forbidden.

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