Model Code Definition

D662 = NG16 ISO4401-07 mounting size, ServoJet jet-pipe pilot construction, onboard integrated drive electronics series

4355 = flow specification code, rated flow 320 L/min at ΔP=35bar per single metering land, internal T return oil channel plus separate external Y drain layout

K = factory preset custom null offset and flow gain calibration for modified flow characteristic, non-standard factory-trimmed version

Technical Specifications

Hydraulic Parameters

Rated Flow: 320 L/min @35bar single land pressure drop; max approximate 550 L/min under 70bar differential supply pressure

Max Working Pressure: P/A/B main control ports 350bar; built-in T internal drain ≤50bar; independent Y external drain port rated up to 350barMoog Inc.

Dynamic Response: Full 0~100% step response ≤28ms under 210bar supply pressureMoog Inc.

Control Precision: Hysteresis＜0.2%FS, Resolution＜0.1%FS, overall thermal drift (-20℃~+55℃)＜2.4%FS

Null Leakage: 0.6~3.3 L/min

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

Net Weight: 3.76kg

Electrical Parameters

Input Power: 24VDC wide-range power supply (18~32VDC), static operating current ≤680mA

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

EMC Grade: Comply with EN55011 industrial EMC specification, electrical connector protection IP65

Port & Connection Configuration

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

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

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

Core Functions

Patented ServoJet jet-pipe pilot design provides superior anti-contamination capacity compared with traditional nozzle-flapper pilot, ensuring long-term stable operation under slightly contaminated hydraulic fluid in harsh industrial working environmentMoog Inc..

Embedded full-spool LVDT closed-loop feedback matching onboard amplifier automatically compensates temperature-induced null drift, supporting uninterrupted 24-hour full-load continuous running.

Standard O-center spring return spool structure: spool returns to middle position when power fails to lock A/B oil cavities and maintain load position, satisfying equipment fail-safe protection requirement.

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

Typical Application

Large tonnage hot forging hydraulic press, metal strip continuous rolling mill tension control, heavy-duty automotive stamping production line, multi-channel hydraulic fatigue test bench, large precision injection molding clamping system, carbon fiber composite hot forming hydraulic equipment.

Installation & Maintenance Instructions

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

Separate high-power power cable and shielded control wire inside different wiring grooves to avoid frequency converter harmonic interference to analog control command.

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

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