Model Code Definition

D663 = D660 series core model, NG25 ISO4401-08 installation dimension, ServoJet jet-pipe pilot structure, onboard amplifier + full-range LVDT spool closed-loop displacement feedbackMoog Inc.

4012 = Exclusive factory fixed trim number with fixed rated flow, preset amplifier gain and null offset parameter calibrated at factory; bare code matches zero-lap linear spool, spring centered neutral and standard NBR sealing; full complete model needs suffix codes for custom connector, seal and drain configuration.

Technical Specifications

Hydraulic Parameters

Rated Flow:215 L/min @35bar single differential pressure; instantaneous peak flow 324 L/min @70bar supply pressure

Max Working Pressure:P/A/B main ports up to 350bar; internal T drain ≤50bar; external Y drain full 350bar withstandableMoog Inc.

Full Stroke Step Response:≤23.8ms under 210bar rated supply pressure

Control Precision:Hysteresis＜0.18%FS, Resolution＜0.065%FS, overall thermal drift(-20~+80℃)＜2.12%FS

Null Leakage:0.28~2.15 L/min, critical zero-overlap linear spool design

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

Net Weight:4.26kg

Electrical Parameters

Input Supply:24VDC wide range input(18~32VDC), static standby current ≤820mA

Standard Control Signal:Factory preset ±10VDC differential voltage; 4~20mA current signal available via factory recalibration

EMC Standard:Comply with EN55011 industrial EMC specification; standard 7-pin military circular electrical connector with IP65 protection after cable assembly.

Port & Connection Configuration

Hydraulic Interface:ISO4401-08 NG25 standard hole layout with independent P supply, A/B actuator ports, separated internal T drain and standalone external Y drain, all port positions adopt standard NBR sealing gasket.

Electrical Interface:7-pin straight circular receptacle integrating 24V power, ±10VDC command signal and LVDT spool feedback signal; double shielded control cable required, single-point cabinet grounding design, no digital fieldbus communication function.

Core Functions

1.Patented ServoJet jet-pipe pilot provides outstanding anti-contamination capability compared with traditional nozzle-flapper pilot, ensuring stable continuous long-running operation under moderate oil impurity heavy-duty working condition.

2.Zero-lap linear spool realizes smooth seamless switching among position, speed and pressure triple closed-loop control; built-in LVDT closed-loop dynamically compensates spool position drift caused by wide-range ambient temperature variation.

3.Spring-centered fail-safe neutral structure: main spool automatically returns to middle position once power failure occurs to lock A/B oil circuit and fix hydraulic cylinder for equipment overload safety protection.

4.Factory fixed amplifier gain matched for large-flow variable heavy load working condition, ±10VDC analog input guarantees stable anti-interference performance for long-distance wiring closed-loop regulation.

Typical Application

Large tonnage hydraulic forging master cylinder servo control, heavy-duty metal high-load fatigue test bench, large-size die-casting machine clamping & injection closed-loop hydraulic system, large composite material hot pressing forming high-precision hydraulic equipment.

Installation & Maintenance Instructions

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

2.Arrange power cable and shielded control wire inside separated wiring troughs to avoid inverter harmonic interference to analog control signal; fasten valve with standard flat washers during installation.

3.All flow gain and null bias parameters are pre-calibrated in MOOG factory; only tiny potentiometer fine adjustment is permitted on site; full disassembly of ServoJet pilot and main spool assembly is strictly forbidden.

4.Seal all unused hydraulic ports with original factory blank plugs during spare storage; store in dry dustproof warehouse to avoid NBR seal ageing and oil leakage.