Model Code Definition

D662 = NG16 ISO4401-07 installation footprint, ServoJet jet-pipe pilot structure, integrated internal drive amplifier product series

4799 = performance specification coding, rated flow 205 L/min @ ΔP=35bar per single metering land, split inner T return oil plus standalone Y external drain design with factory fixed null drift and flow gain parametersMoog Inc.。

Technical Specifications

Hydraulic Parameters

Rated Flow: 205 L/min @35bar single land differential pressure; maximum 368 L/min under 70bar supply differential pressure

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

Dynamic Response: Full-stroke 0~100% step response ≤27.8ms at 210bar supply pressure

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

Null Leakage: 0.58~3.2 L/min

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

Net Weight: 3.74kg

Electrical Parameters

Power Input: 24VDC wide input range (18~32VDC), static working current ≤670mA

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

EMC Grade: Complies with EN55011 industrial EMC standard, military circular electrical connector with IP65 protection ratingMoog Inc.。

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, separate 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 delivers superior contamination resistance versus conventional nozzle-flapper pilot, enabling stable long-cycle continuous operation under slightly contaminated hydraulic oil in harsh industrial environments。

Embedded drive amplifier matched with full-spool LVDT closed-loop automatically compensates temperature-triggered null offset, supporting 24-hour nonstop full-load continuous running.

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

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

Typical Application

Extra-large tonnage hot forging hydraulic press, heavy automotive panel stamping line, wide-width hot rolling mill tension control system, high-load multi-channel hydraulic fatigue test bench, oversized large tonnage injection molding clamping hydraulic unit, aerospace composite hot forming hydraulic 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.

Arrange high-current power cables and shielded control wires inside independent wiring ducts to avoid frequency converter harmonic interference to analog control signals.

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

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