Model Code Definition

D662 = Base model: NG16 ISO4401-07 mounting dimension, ServoJet jet-pipe pilot structure, onboard integrated drive amplifier without external controller

Z4814 = Exclusive factory trim code, defines fixed rated flow, preset null offset, locked amplifier gain and customized internal pilot matching components

No suffix = Standard electronic circuit + regular FKM sealing for normal temperature operating condition

Technical Specifications

Hydraulic Parameters

Rated Flow:235 L/min @35bar single-side differential pressure; peak instantaneous flow 378 L/min under 70bar supply differential pressure

Max Working Pressure:P/A/B main control ports 350bar; built-in T drain ≤50bar; standalone Y external drain rated full 350bar

Full Stroke Step Response:≤25.2ms at standard 210bar supply oil pressure

Control Accuracy:Hysteresis＜0.19%FS, Resolution＜0.075%FS, temperature drift(0~+55℃)＜2.32%FS

Null Leakage:0.48~2.98 L/min

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

Net Weight:3.77kg

Electrical Parameters

Input Power Supply:24VDC wide range(18~32VDC), static standby current ≤682mA

Standard Command Signal:±10VDC differential analog input; ±10mA /4~20mA current input available by factory customized order

EMC Compliance:Conforms to EN55011 industrial EMC standard; 7-pin military circular connector with IP65 protection after complete cable installationMoog Inc.

Port & Connection Configuration

Hydraulic Interface:Standard ISO4401 NG16 mounting hole layout, independent P supply port, A/B actuator control ports, built-in internal T drain, separated Y external drain port

Electrical Interface:7-pin circular receptacle integrating power, analog command and full-range LVDT feedback wiring; double-shielded control cable with single-point grounding inside control cabinet

Control Mode:Pure analog closed-loop regulation, no digital fieldbus communication interface

Core Functions

1.Patented ServoJet jet-pipe pilot delivers superior anti-contamination capability compared with traditional nozzle-flapper pilot, ensuring steady continuous running under moderately contaminated hydraulic fluid in conventional workshop sites.

2.Integrated matched amplifier plus full-travel LVDT closed-loop automatically compensates mild neutral drift caused by normal ambient temperature fluctuation, standard circuit satisfies routine industrial stable operation requirement.

3.Spring-centered fail-safe spool construction:main spool mechanically returns to neutral position once power cuts off to block A/B oil paths and lock actuator position for equipment safety protection.

4.Optimized internal flow channel maintains stable linear flow gain, supports flexible switching among position, velocity and pressure three closed-loop control modes.

Typical Application

Medium tonnage hot forging hydraulic press, automotive sheet metal stamping production line, medium-size steel strip mill tension control system, standard hydraulic component fatigue test bench, medium composite hot-pressing molding equipment, medium-large injection molding clamping hydraulic system.

Installation & Maintenance Instructions

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

2.Arrange power cable and shielded control wire inside separated wiring grooves to avoid inverter harmonic interference on analog control signal.

3.Null offset and flow gain are fully pre-calibrated at MOOG original factory; only tiny on-site potentiometer fine adjustment allowed; complete disassembly of ServoJet pilot and main spool assembly is strictly forbidden.

4.Seal all unused hydraulic ports with dedicated blank plugs during spare part storage; keep inside dry dustproof warehouse to prevent FKM fluororubber seal ageing and medium leakage.