Model Code Definition

D664：D660 high-flow NG25 subseries, two-stage ServoJet jet-pipe pilot, built-in drive amplifier + full-travel LVDT spool closed feedback, base body matches ISO4401 NG25 installation outline

Z：Non-standard tailor-made spool profile, factory bench calibration of flow gain and amplifier operating parameters (non-catalogue standard configuration)

4309：Zero-overlap four-way spring-centred main spool, fixed null overlap value, preset neutral offset and linear flow characteristic

N：Optimized internal drain channel layout + multi-composite customized sealing formulation, improved hydraulic medium compatibility

P05：ISO4401 Size05 precision machined mounting base tolerance, strict flatness control for installation

HX：External X port supplied pilot oil mode, internal pilot oil passage closed & factory sealed

MM6：Modified high-temperature resistant multi-layer composite seal (enhanced anti-aging for mineral oil, -30℃~+90℃ operating fluid temperature)

NEX2-E：Upgraded 11-pin double-shielded circular aviation connector; E grade enhanced anti-vibration & wide-temperature circuit modification, IP65 protection, optimized for high electromagnetic interference workshop environment

Technical Specifications

Hydraulic Parameters

Rated Flow：410 L/min under 35bar single-side differential pressure across spool lands; peak instantaneous flow 1350 L/min at 70bar supply differential pressure

Max Working Pressure：Main P/A/B ports rated 350bar; internal T drain ≤210bar; independent external Y drain full 350bar allowable pressureMoog Inc.

Full Stroke Step Response：≤29ms under standard 210bar supply oil pressure

Control Precision：Hysteresis＜0.23%FS, Resolution＜0.065%FS; overall total thermal drift＜2.05%FS within -30℃~+90℃ working range

Null Leakage：0.22~1.70 L/min based on original factory spool machining tolerance

Working Medium：Anti-wear mineral hydraulic oil, required cleanliness NAS6~7 / ISO4406 17/14/11, operating oil temperature -30℃~+90℃

Net Weight：5.86kg

Electrical Parameters

Power Input：24VDC wide-range supply (18~32VDC), quiescent standby current ≤875mA

Default Control Signal：Factory standard ±10VDC differential analog input; optional ±10mA / 4~20mA current control upon special orderMoog Inc.

Connector：NEX2-E upgraded 11-core double-shielded aviation socket, IP65 ingress protection, EMC EN55011 compliant after full cable assembly

Port & Connection Configuration

Hydraulic Interface：ISO4401 NG25 standard P/A/B/T/Y port layout; HX external X pilot oil supply structure, internal pilot passage blocked; pre-installed MM6 customized high-temp composite mounting gasket; split independent T/Y drain structure, all unused drain ports equipped with OEM original sealing plugs

Electrical Interface：NEX2-E built-in socket integrates 24V power supply, analog command signal and full-range LVDT feedback wiring; double-shielded control cable mandatory with single-point grounding at control cabinet, no fieldbus communication function

Core Functions

1.Patented ServoJet jet-pipe pilot delivers superior dirt immunity vs traditional nozzle-flapper structure, ensures long-term stable continuous operation under moderately contaminated workshop hydraulic oil。

2.Z custom spool matched with N modified drain + MM6 high-performance seal + NEX2-E wide-temperature circuit effectively restrains zero drift under large ambient temperature fluctuation; zero-lap four-way spool realizes high-precision closed-loop position, speed and clamping force control of hydraulic cylinder。

3.Spring-centered fail-safe neutral design: main spool automatically returns to middle position upon power loss to shut off A/B oil paths and lock actuator, preventing equipment runaway crash caused by sudden power failure。

4.NEX2-E E-type upgraded anti-vibration plug adapts strong vibration & high EMI industrial field wiring; P05 precision mounting reduces installation-induced null shift and improves long-term control stability。

Typical Application

Heavy-duty hydraulic forging press master cylinder closed-loop control, steel mill auxiliary hydraulic servo system, non-ferrous metal extrusion forming equipment, medium-load hydraulic fatigue test bench, hot rolling mill auxiliary servo cylinder position regulation system。

Installation & Maintenance Instructions

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

2.Power cable and shielded control wire must be routed in separated wiring troughs to avoid inverter harmonic interference; mount valve with specified bolt torque complying with P05 ISO05 mounting standard。

3.All flow gain, null offset and amplifier parameters 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.MM6 customized composite seal and NEX2-E E-grade connector are special factory customization parts, cannot be substituted with standard NBR/FKM seal or common standard plug; during spare storage, fully seal idle T/Y drain ports with original factory plugs and store in dry dustproof warehouse to avoid seal aging and oil leakage。