Model Code Definition

D663 = Base series: ISO4401-05 NG10 installation size, ServoJet jet-pipe pilot stage, onboard integrated drive electronics plus full-range LVDT spool position closed-loop feedback

339 = Exclusive factory calibration trim code, fixed rated flow, pre-set null offset, locked amplifier gain and matched original pilot component assembly

N = Non-zero spool overlap design (small positive overlap), improved zero-point stability and reduced null leakage vs standard zero-lap spool

C = Customized drain internal flow channel + standard NBR rubber sealing for general mineral hydraulic oil, conventional industrial PCB layout without anti-explosion or high-low temp special customization

Technical Specifications

Hydraulic Parameters

Rated Flow:62 L/min @35bar single-side differential pressure; peak instantaneous flow 105 L/min @70bar supply differential pressure

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

Full Stroke Step Response:≤24.2ms under 210bar standard supply oil pressure

Control Precision:Hysteresis＜0.22%FS, Resolution＜0.08%FS, total thermal drift(-20~+75℃)＜2.35%FS

Null Leakage:0.22~1.80 L/min (lower leakage due to N positive overlap spool)

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

Net Weight:3.02kg

Electrical Parameters

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

Standard Command Signal:Factory default ±10VDC differential analog input; ±10mA /4~20mA current signal available by re-calibration customization

EMC Standard:Comply with EN55011 industrial EMC standard; 7-pin military circular connector, IP65 protection after complete cable assemblyMoog Inc.

Port & Connection Configuration

Hydraulic Interface:Standard ISO4401-05 NG10 hole layout, independent P supply port, A/B actuator ports, built-in T internal drain plus standalone Y external drain modified by C suffix, standard cast valve body with NBR full sealing

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

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

Core Functions

1.Patented ServoJet jet-pipe pilot features outstanding contamination resistance compared with traditional nozzle-flapper pilot, stable long-running operation under slightly contaminated hydraulic medium.

2.N positive overlap spool effectively reduces zero-point leakage and improves anti-pressure fluctuation capacity; C customized internal oil passage optimizes pilot oil flowing stability; built-in LVDT closed-loop automatically compensates spool drift induced by ambient temperature change.

3.Spring-centered fail-safe spool structure:main spool returns to middle position automatically once power cut off to block A/B oil circuit and lock hydraulic cylinder for equipment safety protection.

4.Linear flow characteristic under rated stroke, supports seamless switching of position, velocity and pressure three closed-loop control modes.

Typical Application

Metallurgical small rolling mill auxiliary servo system, precision material tensile & compression fatigue test bench, medium-tonnage injection molding core pulling hydraulic system, auto parts cold forging hydraulic press, general industrial precision hydraulic cylinder closed-loop drive equipment.

Installation & Maintenance Instructions

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

2.Arrange power cable and shielded control wire inside separated wiring duct to avoid frequency converter harmonic interference to analog control signal; fasten valve with standard flat washers during mounting.

3.Flow gain and null offset are fully pre-calibrated at MOOG factory; only slight on-site potentiometer fine-tuning is allowed; complete disassembly of ServoJet pilot and main spool assembly is strictly forbidden.

4.Seal all unused hydraulic ports with original blank plugs for spare part storage; keep warehouse dry and dustproof to prevent NBR seal aging and oil leakage.