Model Code Definition

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

4709 = flow specification code, rated flow 145 L/min @ ΔP=35bar per single metering land, separated internal T drain and external Y drain port layout, standard factory null & gain setting

Technical Specifications

Hydraulic Parameters

Rated Flow: 145 L/min @35bar single land differential pressure; max 265 L/min under 70bar supply differential pressure

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

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

Control Precision: Hysteresis＜0.18%FS, Resolution＜0.1%FS, total thermal drift (-20℃~+55℃)＜2.3%FS

Null Leakage: 0.55~3.1 L/min

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

Net Weight: 3.68kg

Electrical Parameters

Power Input: 24VDC wide voltage (18~32VDC), static operating current ≤650mA

Standard Control Command: ±10VDC differential analog input; optional ±10mA /4~20mA current signal on customized orderMoog Inc.

EMC Standard: Complies with EN55011 industrial electromagnetic compatibility, electrical connector IP65 protection grade

Port & Connection Configuration

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

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

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

Core Functions

Patented ServoJet jet-pipe pilot structure features superior contamination resistance vs traditional nozzle-flapper pilot, stable continuous operation under slightly contaminated hydraulic fluid in harsh industrial environments。

Embedded LVDT full-spool closed-loop paired with internal amplifier automatically compensates temperature-induced null drift, supports nonstop 24h full-load continuous running.

Centered spring return spool design: spool resets to neutral position during power failure to lock A/B oil chambers and secure load position to meet equipment fail-safe protection requirement.

Optimized internal flow channel maintains linear flow gain, supports flexible switching among position, speed and pressure closed-loop control modes on single valve unit.

Typical Application

Medium tonnage hot forging hydraulic press, steel strip mill tension control, automotive medium-sized stamping line, multi-channel hydraulic fatigue test rig, medium precision injection molding clamping equipment, composite material hot pressing hydraulic machinery。

Installation & Maintenance Instructions

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

Separate high-current power cable and shielded control wire in different wiring troughs to avoid frequency converter harmonic interference on analog control signal.

Null offset and flow gain are preset at MOOG factory; only minor on-site potentiometer fine adjustment allowed; complete disassembly of ServoJet pilot assembly and main spool is strictly forbidden。

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