Model Code Definition

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

4767 = flow grade coding, rated flow 172 L/min @ ΔP=35bar per single metering land, split internal T return oil + standalone Y external drain structural design with factory preset null offset and flow gain parameters.

Technical Specifications

Hydraulic Parameters

Rated Flow: 172 L/min @35bar single land differential pressure; maximum 308 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 port rated 350bar

Dynamic Response: Full-stroke 0~100% step response ≤27.2ms at 210bar supply pressure

Control Accuracy: Hysteresis＜0.18%FS, Resolution＜0.1%FS, total thermal drift (-20℃~+55℃)＜2.2%FS

Null Leakage: 0.55~3.1 L/min

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

Net Weight: 3.70kg

Electrical Parameters

Power Supply: 24VDC wide-range input (18~32VDC), static operating current ≤655mA

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

EMC Compliance: Conforms to EN55011 industrial EMC standard, circular electrical connector with IP65 ingress protection grade

Port & Connection Configuration

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

Electrical Interface: 7-pin military circular receptacle integrating power supply, analog command signal and full-travel 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 features outstanding anti-contamination performance compared to traditional nozzle-flapper pilot, ensuring stable long-cycle operation under moderately contaminated hydraulic fluid in severe industrial environments.

Embedded drive amplifier matched with full-spool LVDT closed-loop automatically offsets temperature-induced null drift, supporting uninterrupted 24-hour full-load continuous running.

Standard spring-centered neutral spool design: spool resets to mid-position upon power loss to lock A/B oil cavities and fix load position for equipment fail-safe protection.

Optimized internal flow passages maintain linear flow gain, enabling flexible switching among position, velocity and pressure closed-loop control modes on single valve body.

Typical Application

Large-tonnage hot forging hydraulic press, heavy-duty automotive stamping production line, wide steel strip mill tension control system, multi-channel large-load hydraulic fatigue test bench, heavy-spec injection molding clamping hydraulic system, oversized composite hot-press forming equipment.

Installation & Maintenance Instructions

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

Separate high-current power cable and shielded control wire inside independent wiring ducts 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 potentiometer fine trimming is permitted; complete disassembly of ServoJet pilot unit and main spool assembly is strictly forbidden.

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