Model Code Definition

D664 = D660 high-flow subseries, NG25 ISO standard mounting, ServoJet jet-pipe pilot, built-in amplifier + full-range LVDT spool closed-loop feedback

-Z = Custom factory trim: modified spool flow characteristic + matched internal amplifier parameter different from standard catalog specification

4306 = Pre-calibrated zero-overlap four-way spring-centered metering spool with fixed flow gain, null offset preset at factory bench calibration

K = Rolling mill dedicated optimized amplifier version, enhanced thermal drift suppression & gain tuning for frequent variable load of hot/cold rolling line

Technical Specifications

Hydraulic Parameters

Rated Flow:395 L/min @35bar differential pressure across spool lands; peak instantaneous flow 1310 L/min @70bar supply differential pressure

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

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

Control Accuracy:Hysteresis＜0.22%FS, Resolution＜0.062%FS, total thermal drift(-20~+80℃)＜1.95%FS after K-circuit optimization

Null Leakage:0.20~1.65 L/min based on OEM spool machining tolerance

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

Net Weight:5.82kg

Electrical Parameters

Power Input:24VDC supply (18~32VDC wide range), quiescent standby current ≤860mA

Default Control Signal:±10VDC differential analog input; ±10mA / 4~20mA current control configurable via factory special order

Connector:11-pin circular military receptacle, IP65 rating after complete shielded cable fitting

EMC Compliance:EN55011 industrial electromagnetic compatibility standard

Port & Connection Configuration

Hydraulic Interface:ISO4401 NG25 standard port layout including P supply port, A/B actuator control ports, separated internal T drain and independent external Y drain; original NBR mounting gasket pre-assembled at factory, unused X pilot port sealed with OEM blank plug (internal pilot oil feed standard for this unit)

Electrical Interface:11-pin circular socket integrates 24V power, ±10V command signal and full-travel LVDT feedback wiring; double-shielded control cable required with single-point earthing at control cabinet; no fieldbus communication function available.

Core Functions

1.Patented ServoJet jet-pipe pilot outperforms traditional nozzle-flapper pilot on anti-contamination performance, ensuring long-term steady continuous operation under moderately contaminated hydraulic oil of metallurgical rolling workshop.

2.Z-custom spool matched with K-version optimized amplifier effectively restrains wide-temperature null drift; zero-lap four-way spool delivers high-precision closed-loop position, speed and force regulation for rolling mill AGC roll gap control and heavy forging master cylinder.

3.Spring-centered fail-safe neutral design: spool automatically returns to center upon power loss to lock A/B oil paths and fix hydraulic cylinder, preventing roller runaway and equipment crash.

4.Factory preset fixed gain optimized for cyclic variable rolling load; ±10VDC analog control features superior anti-interference suitable for long-distance field wiring on rolling production line.

Typical Application

Hot & cold rolling mill AGC automatic thickness control system, continuous strip production line roll gap closed-loop servo, medium-tonnage hydraulic forging press master cylinder control, aluminum extrusion forming equipment, medium-sized hydraulic component fatigue test bench.

Installation & Maintenance Instructions

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

2.Arrange power cables and shielded control wires inside separated cable channels to avoid frequency converter harmonic interference; mount valve with factory specified bolt torque and standard flat washers.

3.All flow gain and null parameters of D664-Z4306K 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.Plug unused T/Y spare drain ports with original factory plugs during spare storage; store valve inside dry dustproof warehouse to prevent NBR seal aging and oil leakage.