Model Code Definition

D663 = Base series: ISO4401-05 NG10 mounting dimension, ServoJet jet-pipe pilot stage, embedded integrated amplifier + full-range LVDT spool position feedbackMoog Inc.

308 = Factory exclusive trim number, defines fixed rated flow, pre-calibrated null bias, locked amplifier gain and matched internal pilot assembly

B = Standard industrial specification: improved anti-vibration PCB layout, standard NBR+FKM composite sealing, general industrial ambient temperature calibration without explosion-proof or ultra-low temp customization

Technical Specifications

Hydraulic Parameters

Rated Flow:72 L/min @35bar single-land differential pressure; peak instantaneous flow 123 L/min @70bar supply differential pressure

Max Working Pressure:P/A/B main ports up to 350bar; internal T drain ≤50bar; standalone Y external drain withstand full 350bar rated pressure

Full Stroke Step Response:≤23.0ms under standard 210bar supply oil pressure

Control Precision:Hysteresis＜0.19%FS, Resolution＜0.072%FS, overall thermal drift(-10~+70℃)＜2.15%FS

Null Leakage:0.38~2.62 L/min

Working Medium:Anti-wear mineral hydraulic oil, cleanliness NAS6~7 / ISO4406 17/14/11, fluid operating temperature -10℃~+75℃

Net Weight:3.02kg

Electrical Parameters

Input Power:24VDC wide input(18~32VDC), static standby current ≤610mA

Standard Control Command:±10VDC differential analog input; ±10mA /4~20mA current signal available via factory custom orderMoog Inc.

EMC Standard:Comply with EN55011 industrial EMC; 7-pin military circular connector, IP65 after complete cable wiring

Port & Connection Configuration

Hydraulic Interface:Standard ISO4401-05 NG10 mounting hole layout, separated P supply, A/B actuator control ports, built-in T internal drain + independent Y external drain; B version with standard cast valve body without thickened reinforcement

Electrical Interface:7-pin circular receptacle integrating power, analog command and full-travel LVDT feedback; double-shielded control cable with single-point cabinet grounding

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

Core Functions

1.Patented ServoJet jet-pipe pilot provides superior anti-contamination capability vs traditional nozzle-flapper design, stable long-running operation under moderately contaminated hydraulic fluid。

2.B-type optimized PCB circuit reduces ordinary temperature drift, composite sealing improves medium compatibility for common industrial hydraulic oil; built-in LVDT closed-loop automatically compensates spool position deviation caused by temperature variation.

3.Spring-centered fail-safe spool:automatically returns to neutral on power loss to cut off A/B oil circuit and lock hydraulic actuator for equipment protection.

4.Zero-overlap spool ensures linear flow characteristic, supports seamless switching of position, velocity and pressure three closed-loop control modes.

Typical Application

General metal forming hydraulic press, plastic injection molding core clamping control, automobile part stamping equipment, conventional material fatigue test bench, paper machinery hydraulic servo drive, general engineering machinery precision hydraulic cylinder control.

Installation & Maintenance Instructions

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

2.Arrange power and shielded control wire inside independent wiring duct to avoid inverter harmonic interference on analog control signal, mount valve with standard flat washer.

3.Null bias and flow gain fully pre-calibrated at MOOG factory; only minor on-site potentiometer fine adjustment permitted; complete disassembly of ServoJet pilot and main spool assembly is strictly forbidden.

4.Seal all unused hydraulic ports with dedicated blank plugs during spare storage; store inside dry dustproof warehouse to prevent rubber seal ageing and oil leakage.