Model Code Definition

D662 = NG16 ISO4401-07 mounting dimension, ServoJet jet-pipe pilot structure, onboard integrated electronic amplifier base series

Z397 = Factory exclusive custom trim code covering spool flow rating, null preset offset, internal pilot component revision and factory gain calibration parameter

K = NBR standard rubber seal specification + customized drain channel layout factory suffix mark

Technical Specifications

Hydraulic Parameters

Rated Flow: 205 L/min @35bar single metering land differential pressure; max 372 L/min under 70bar supply differential pressure

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

Dynamic Response: Full 0~100% stroke step response ≤29.2ms at 210bar supply pressureMoog Inc.

Control Accuracy: Hysteresis＜0.21%FS, Resolution＜0.09%FS, total temperature drift (-20℃~+55℃)＜2.38%FS

Null Leakage: 0.60~3.30 L/min

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

Net Weight: 3.75kg

Electrical Parameters

Power Supply: 24VDC wide input range (18~32VDC), static working current ≤688mAMoog Inc.

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

EMC Compliance: Conforms to EN55011 industrial EMC standard; military circular electrical connector with IP65 protection grade after cable assembly

Port & Connection Configuration

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

Electrical Interface: Standard 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 regulation, no digital fieldbus communication interface

Core Functions

Patented ServoJet jet-pipe pilot delivers superior anti-contamination performance compared with conventional nozzle-flapper pilot, supporting long-term stable continuous operation under moderately contaminated hydraulic fluid in severe industrial working environments。

Embedded full-spool LVDT closed-loop matching onboard amplifier automatically compensates ambient-temperature-induced null drift, enabling nonstop 24-hour full-load continuous running。

Factory preset spring-centered fail-safe spool design: spool automatically returns to neutral upon power loss to lock A/B oil cavities and fix load position for equipment safety protection。

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

Typical Application

Medium tonnage hot forging hydraulic press, automotive sheet metal stamping production line, medium-width steel strip mill tension control, hydraulic component fatigue test bench, composite hot-press forming equipment, medium-size precision injection molding clamping 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。

Separate high-current power wiring and shielded control cable inside independent wiring trunking to avoid inverter harmonic interference on analog control signal。

Null offset and flow gain are fully pre-calibrated at Moog factory; only minor on-site potentiometer fine trimming is permitted; complete disassembly of ServoJet pilot assembly and main spool is strictly forbidden。

Seal all hydraulic ports with dedicated blocking plugs during long-term spare storage; store inside dry dustproof warehouse to prevent NBR rubber seal aging and hydraulic fluid leakage。