Model Code Definition

D662 = NG16 ISO4401-07 installation size, ServoJet jet-pipe pilot structure, internal integrated electronic amplifier base model

Z4109 = Exclusive factory trim code defining rated flow specification, null bias preset, internal pilot component revision and fixed factory gain calibration data

No suffix letter = Standard FKM fluorocarbon rubber sealing structure, standard drain passage layout

Technical Specifications

Hydraulic Parameters

Rated Flow: 238 L/min @35bar single metering edge differential pressure; peak 415 L/min under 70bar supply differential pressure

Max Working Pressure: P/A/B main control ports 350bar; internal T drain ≤50bar; independent Y external drain rated 350bar

Dynamic Response: Full 0~100% spool stroke step response ≤27.8ms at 210bar supply pressureMoog Inc.

Control Accuracy: Hysteresis＜0.19%FS, Resolution＜0.08%FS, overall temperature drift (-20℃~+55℃)＜2.25%FS

Null Leakage: 0.52~3.15 L/min

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

Net Weight: 3.76kg

Electrical Parameters

Power Supply: 24VDC wide input (18~32VDC), quiescent operating current ≤685mA

Standard Command Signal: ±10VDC differential analog input; optional ±10mA /4~20mA current signal available via factory special order

EMC Compliance: Comply with EN55011 industrial EMC specification; military circular connector with IP65 protection after cable wiring completion

Port & Connection Configuration

Hydraulic Interface: Standard ISO4401-07 NG16 bolt hole arrangement; P supply port, built-in internal T drain port, A/B actuator control ports, separated Y external drain port

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

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

Core Functions

Patented ServoJet jet-pipe pilot provides superior anti-contamination capability compared with traditional nozzle-flapper pilot, enabling stable long-duration continuous operation under moderately contaminated hydraulic fluid in severe industrial environments.

Embedded full-stroke LVDT closed-loop matches internal amplifier to automatically compensate ambient-temperature-induced null drift, supporting 24-hour non-stop full-load continuous operation.

Factory pre-set spring-centered fail-safe spool design: spool automatically returns to neutral upon power cut-off to lock A/B oil chambers and fix load position for mechanical safety protection.

Optimized internal flow channel maintains linear flow gain, supporting flexible switching among position, velocity and pressure closed-loop control modes on single valve body.

Typical Application

Medium-large hot forging hydraulic press, automotive stamping production line, medium-width steel strip mill tension control system, hydraulic component fatigue test bench, carbon fiber composite hot-press molding equipment, high-precision large injection molding clamping control system.

Installation & Maintenance Instructions

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

Route high-current power cable and shielded control wire inside separate wiring ducts to avoid frequency converter harmonic interference to analog control signal.

Null offset and flow gain are fully pre-calibrated at MOOG factory; only minor on-site potentiometer fine trimming is allowed; complete disassembly of ServoJet pilot assembly and main spool is strictly prohibited.

Block all hydraulic ports with dedicated sealing plugs during long-term spare storage; store inside dry dustproof warehouse to prevent FKM rubber seal aging and hydraulic fluid leakage.