Model Code Definition

D662 = NG16 ISO4401-07 installation dimension, ServoJet jet-pipe pilot construction, onboard integrated electronic control module series

4337 = flow specification coding, rated flow 290 L/min at ΔP=35bar per single metering land, internal T return + separate external Y drain structure; full standard ordering code D02HYABN6VSF3-K, D02 O-center spool configuration, FKM fluorine rubber sealing, ±10VDC differential analog command input, 7-pin military circular connector, full-travel LVDT spool feedback, matched D061 original pilot valve component.

K = custom factory calibration parameter for unique flow characteristic modification, non-standard off-the-shelf trim version.

Technical Specifications

Hydraulic Parameters

Rated Flow: 290 L/min @35bar single land pressure drop; maximum approx. 505 L/min under 70bar differential supply pressure

Max Working Pressure: 350 bar for P/A/B main working ports; internal T drain ≤50bar, standalone Y external drain up to 350barMoog Inc.

Dynamic Response: Full 0~100% step response ≤27ms under 210bar supply pressure

Control Precision: Hysteresis＜0.2%FS, Resolution＜0.1%FS, overall thermal drift (-20℃~+55℃)＜2.35%FS

Null Leakage: 0.55~3.1 L/min

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

Net Weight: 3.72kg

Electrical Parameters

Input Power: 24VDC wide-range supply (18~32VDC), static operating current ≤670mA

Standard Control Signal: ±10VDC differential analog input; optional ±10mA or 4~20mA current signal upon custom order

EMC Standard: Compliant with EN55011 industrial specification; electrical connector protection grade IP65

Port & Connection Configuration

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

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

Control Mode: Full analog closed-loop regulation, no industrial fieldbus communication interface.

Core Functions

Patented ServoJet jet-pipe pilot structure delivers superior anti-contamination performance versus traditional nozzle-flapper pilot, ensuring long-term stable running under slightly contaminated hydraulic fluid in harsh industrial working conditionsMoog Inc..

Embedded full-spool LVDT closed-loop together with onboard amplifier automatically compensates temperature-caused null drift, supporting 24-hour continuous full-load stable operation.

D02 middle closed spool design: spool springs back to center upon power failure to lock A/B actuator cavities for load holding, meeting equipment fail-safe protection requirement.

Optimized internal flow passage ensures linear flow gain; single valve supports seamless switching among position, velocity and pressure closed-loop control modes.

Typical Application Fields

Precision thin strip rolling mill hydraulic tension control, medium tonnage hot forging hydraulic press, automotive stamping forming equipment, multi-specimen hydraulic fatigue test bench, precision large injection molding clamping system, medium-size carbon fiber composite hot-press molding machine.

Installation & Maintenance Instructions

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

Separate high-current power cable and shielded control wiring inside different cable ducts to avoid frequency converter harmonic interference on analog control signals.

Null offset and flow gain are pre-calibrated at MOOG factory; only minor on-site electrical potentiometer trimming permitted; full disassembly of ServoJet pilot assembly and main spool is strictly forbidden.

Seal all hydraulic ports tightly with blocking plugs during long-term spare storage; store inside dry dustproof warehouse to prevent rubber seal aging and medium leakage.