Model Code Definition

D663 = D660 core series, NG10 ISO4401-05 installation size, ServoJet jet-pipe pilot construction, onboard amplifier + full-travel LVDT spool closed-loop feedback architecture

Z = Custom factory modification code for non-standard flow gain & null characteristic calibration

4305 = Exclusive fixed trim number to define rated flow, amplifier gain and preset null offset; four-way spring-centered spool with 10% positive overlap metering profile

K = Custom option: high-temperature resistant enhanced sealing, anti-vibration internal amplifier layout, improved thermal zero stability for long-duration continuous load operation.

Technical Specifications

Hydraulic Parameters

Rated Flow:326 L/min @35bar single-side differential pressure; peak instantaneous flow 453 L/min @70bar supply differential pressure

Max Working Pressure:P/A/B main control ports up to 350bar; internal T drain ≤210bar; standalone external Y drain withstand full 350bar system pressure

Full Stroke Step Response:≤28.5ms under standard 210bar supply hydraulic pressure

Control Precision:Hysteresis＜0.25%FS, Resolution＜0.08%FS, overall thermal drift(-20~+80℃)＜2.35%FS

Null Leakage:0.42~2.16 L/min due to 10% positive overlap spool design

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

Net Weight:3.62kg

Electrical Parameters

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

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

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

Port & Connection Configuration

Hydraulic Interface:ISO4401-05 NG10 standard mounting hole pattern with independent P supply port, A/B actuator control ports, split internal T drain and dedicated external Y drain, factory pre-installed compound fluorine rubber sealing gaskets matching K suffix configuration

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

Core Functions

1.Patented ServoJet jet-pipe pilot features outstanding contamination resistance compared to conventional nozzle-flapper pilot, realizing steady continuous operation under moderately contaminated hydraulic fluid environment.

2.10% positive overlap main spool guarantees stable medium-high flow regulation for pressure/force closed-loop control; onboard LVDT closed-loop dynamically compensates spool position shift caused by wide-range ambient temperature variation, K suffix further suppresses long-running zero drift under fluctuating working temperature.

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

4.Factory fixed amplifier gain optimized for medium-high flow heavy-duty working conditions; ±10VDC analog input delivers excellent anti-interference performance for medium-long wiring precision closed-loop control.

Typical Application

Large-tonnage hydraulic forging press master cylinder force closed-loop control, heavy metallurgical hot rolling mill hydraulic actuator positioning control, oversized multi-channel material fatigue test bench high-flow hydraulic drive, large die-casting equipment clamping & injection precision control, aerospace composite hot-forming hydraulic control system.

Installation & Maintenance Instructions

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

2.Separate power cables and shielded control wires inside independent wiring ducts to avoid inverter harmonic interference to analog control signals; mount valve with standard flat washers following factory specified tightening torque.

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

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