Model Code Definition

D664：D660 high-flow NG25 subseries, ServoJet jet-pipe pilot, integrated onboard amplifier + full-range LVDT spool closed feedback

Z：Factory tailor-made spool flow curve + matched internal amplifier parameters (non-standard catalog specification)

4306：Pre-bench calibrated zero-overlap four-way spring-centered spool with fixed flow gain & preset null offset

K：Rolling mill dedicated amplifier upgrade, enhanced thermal drift suppression for frequent fluctuating heavy cyclic load

P05：ISO4401 Size05 precision machining mounting base tolerance

JX：Internal pilot oil supply, X external pilot port factory blank sealed

NF6：FKM fluorocarbon high-temperature resistant sealing compound

VSX2HA：Upgraded 11-pin shielded circular aviation plug; S2 anti-vibration grade, X2 enhanced IP65 ingress protection, HA wide-temperature circuit modification for -30℃~+95℃ ambient working condition

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 main service ports rated 350bar; internal T drain ≤210bar; independent external Y drain full 350bar allowable pressure

Full Stroke Step Response：≤27.5ms under nominal 210bar supply pressureMoog Inc.

Control Accuracy：Hysteresis＜0.22%FS, Resolution＜0.062%FS; HA circuit + NF6 seal combined total thermal drift(-30~+95℃)＜1.95%FS

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

Working Medium：Anti-wear mineral hydraulic oil; fluid cleanliness NAS6~7 / ISO4406 17/14/11, operating fluid temperature -30℃~+95℃

Net Weight：5.82kg

Electrical Parameters

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

Default Control Signal：Factory standard ±10VDC differential analog input; ±10mA / 4~20mA current signal configurable by special order

Connector：VSX2HA upgraded 11-pin double-shielded circular receptacle, IP65 rating after complete cable assembly, anti-shock & wide-temperature optimized per HA specification, EMC EN55011 compliantMoog Inc.

Port & Connection Configuration

Hydraulic Interface：ISO4401 NG25 standard P/A/B/T/Y port layout; JX internal pilot feed with unused X port factory plugged; pre-installed NF6 FKM high-temp mounting gasket; separated internal T drain + independent external Y drain, spare drain ports equipped with OEM sealing plugs

Electrical Interface：VSX2HA socket integrates 24V power supply, ±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 outperforms traditional nozzle-flapper pilot on dirt immunity, supporting long-term stable continuous operation under moderately contaminated workshop hydraulic oilMoog Inc..

2.Z custom spool matched with K rolling-mill amplifier + NF6 high-temp seal + VSX2HA HA wide-temperature circuit drastically suppress zero drift under large ambient temperature fluctuation; zero-lap four-way spool realizes high-precision closed-loop position/speed/force control for AGC roll gap regulation.

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

4.VSX2HA upgraded anti-vibration & high-temperature plug adapts harsh high-temperature, strong electromagnetic interference rolling mill field wiring environment; P05 precision mounting improves valve installation concentricity to reduce installation-induced null shift.

Typical Application

Hot & cold rolling mill AGC automatic thickness closed-loop control system, continuous strip production roll gap servo, heavy-duty hydraulic forging master cylinder control, aluminum extrusion high-temperature hydraulic system, wide-temperature range hydraulic fatigue test bench.

Installation & Maintenance Instructions

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

2.Power cable and shielded control wire must be laid in separated wiring troughs to avoid inverter harmonic interference; mount valve with specified bolt torque complying with P05 mounting standard.

3.All flow gain, null offset and amplifier parameters pre-calibrated at MOOG factory; only minor on-site potentiometer fine adjustment allowed; full disassembly of ServoJet pilot and main spool assembly is strictly prohibited.

4.NF6 FKM seal & VSX2HA HA connector are customized for high-temperature working condition, cannot be replaced with standard NBR seal or common VSX2 connector; during spare storage, seal all unused T/Y drain ports with original plugs and store in dry dustproof warehouse to avoid seal aging and oil leakage.