Model Code Definition

D664：D660 large-flow subseries, NG25 ISO4401 mounting, ServoJet jet-pipe pilot, built-in amplifier + full-range LVDT spool closed feedback

Z：Factory customized spool flow characteristic + matched internal amplifier parameters (non-standard catalog specification)

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

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

P05：ISO4401 standard size 05 installation machining tolerance, customized base mounting surface dimension

JX：Internal pilot oil feed configuration, X pilot port factory plugged without external pilot oil access

NF6：FKM fluorine rubber high-temperature resistant sealing material, applicable for wide-temperature hydraulic medium (-30~+95℃)

VSX2-A：11-pin shielded circular aviation plug (IP65), single-end cabinet grounding requirement, factory final acceptance batch specification suffix A

Technical Specifications

Hydraulic Parameters

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

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

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

Control Precision：Hysteresis＜0.22%FS, Resolution＜0.062%FS, overall thermal drift(-20~+80℃)＜1.95%FS after K-circuit & NF6 high-temp seal matching

Null Leakage：0.20~1.65 L/min (depends on original spool machining tolerance)

Working Medium：Anti-wear mineral hydraulic oil, cleanliness NAS6~7 / ISO4406 17/14/11; medium temperature -30℃~+95℃ (upgraded by NF6 FKM seal)

Net Weight：5.82kg

Electrical Parameters

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

Default Control Signal：Factory standard ±10VDC differential analog input; ±10mA /4~20mA current signal optional per custom order

Connector：VSX2-A defined 11-pin shielded circular receptacle, IP65 ingress protection after complete shielded cable assembly, EMC EN55011 certifiedMoog Inc.

Port & Connection Configuration

Hydraulic Interface：ISO4401 NG25 standard P/A/B/T/Y port layout; JX defined internal pilot oil supply, unused X pilot port factory sealed with blank plug; NF6 FKM pre-installed mounting gasket, separated internal T drain + independent external Y drain, all spare drain ports equipped with original factory sealing plugs

Electrical Interface：VSX2-A 11-pin circular socket integrates 24V power, ±10V command signal and full-stroke LVDT feedback wiring; double-shielded control cable mandatory, single-point grounding at control cabinet, no fieldbus communication function available.

Core Functions

1.Patented ServoJet jet-pipe pilot delivers outstanding contamination resistance vs conventional nozzle-flapper pilot, stable continuous operation under moderately contaminated hydraulic fluid of metallurgical rolling workshopMoog Inc..

2.Z-custom spool matched with K optimized amplifier + NF6 high-temperature seal restrains wide-temperature zero drift; zero-lap four-way spool realizes high-precision closed-loop position/speed/force control for hot/cold mill AGC roll gap regulation and heavy forging cylinder.

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

4.P05 optimized mounting tolerance improves installation concentricity; VSX2-A customized connector enhances long-distance wiring anti-interference for on-site harsh electromagnetic environment of rolling production line.

Typical Application

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

Installation & Maintenance Instructions

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

2.Power & control shielded cables must run inside separated wiring troughs to avoid inverter harmonic interference; fix valve with factory specified bolt torque matching P05 mounting standard.

3.All flow gain, null offset and amplifier parameters pre-calibrated at MOOG factory; only minor on-site potentiometer fine-tuning permitted; complete disassembly of ServoJet pilot and main spool assembly is strictly forbidden, internal circuit modification prohibited.

4.NF6 FKM seal avoids ageing under high temperature; during spare storage, block unused T/Y drain ports with original factory plugs, store in dry dustproof warehouse to prevent medium erosion and oil leakage; cannot replace with standard NBR seal version on high-temperature working site.