Model Code Definition

D663 = D660 core series, NG10 ISO4401-05 installation dimension, ServoJet jet-pipe pilot construction, built-in amplifier + full-range LVDT spool displacement closed-loop feedback

4021 = Exclusive factory fixed trim number with preset rated flow, fixed amplifier gain and null offset pre-calibration at factory; bare model matches zero-lap four-way spring centered spool and standard NBR sealing; complete full model extends with suffix codes for custom seal, connector and drain configuration options.

Technical Specifications

Hydraulic Parameters

Rated Flow:172 L/min @35bar single-side differential pressure; peak instantaneous flow 258 L/min @70bar supply differential pressure

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

Full Stroke Step Response:≤21.2ms under 210bar rated supply oil pressure

Control Precision:Hysteresis＜0.16%FS, Resolution＜0.06%FS, overall thermal drift(-20~+80℃)＜2.05%FS

Null Leakage:0.22~1.85 L/min, critical zero-overlap linear flow spool design

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

Net Weight:3.28kg

Electrical Parameters

Input Power Supply:24VDC wide-range input(18~32VDC), static standby current ≤730mA

Standard Control Command:Factory preset ±10VDC differential analog voltage input; 4~20mA current signal configurable via factory recalibration

EMC Compliance:Conform to EN55011 industrial EMC standard; standard 7-pin military circular connector with IP65 protection after complete cable assembly.

Port & Connection Configuration

Hydraulic Interface:ISO4401-05 NG10 standard hole layout including independent P supply port, A/B actuator control ports, separated internal T drain plus external Y drain, cast valve body equipped with standard NBR port sealing gaskets.

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

Core Functions

1.Patented ServoJet jet-pipe pilot has superior anti-pollution performance versus traditional nozzle-flapper pilot, ensuring long-term stable continuous operation under moderately contaminated hydraulic fluid environment.

2.Zero-lap main spool provides excellent linear flow characteristic to support seamless switching among position, speed and pressure three closed-loop control modes; onboard LVDT closed-loop dynamically compensates spool position drift caused by ambient temperature variation.

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

4.Factory fixed amplifier gain matched for medium-high flow variable load working condition, ±10VDC analog input delivers outstanding anti-interference performance for short/medium-distance wiring high-precision closed-loop regulation.

Typical Application

Medium-high tonnage hydraulic forging press servo cylinder control, heavy-duty metal tensile/fatigue test bench closed-loop hydraulic system, medium-large die-casting machine injection & clamping precision control, composite material high-temperature hot forming hydraulic equipment.

Installation & Maintenance Instructions

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

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

3.Flow gain and null offset parameters are fully pre-calibrated at MOOG factory; only minor on-site potentiometer fine adjustment is permitted; complete disassembly of ServoJet pilot and main spool assembly is strictly prohibited.

4.Seal all unused hydraulic ports with original blank plugs for spare part storage; preserve in dry dustproof warehouse to prevent NBR seal ageing and hydraulic fluid leakage.