Model Code Definition

D664 = D660 high-flow subseries, NG25 ISO4401 installation dimension, patented ServoJet jet-pipe pilot structure, built-in drive amplifier + full-range LVDT spool closed-loop feedback

4036 = Factory calibrated zero-overlap four-way spring-centered metering spool, fixed amplifier gain and null offset preset at original factory

No extended suffix = Standard NBR sealing, split T/Y separate drain ports, standard 11-pin circular aviation plug configuration。

Technical Specifications

Hydraulic Parameters

Rated Flow:420 L/min @35bar single-side differential pressure; peak instantaneous flow 1380 L/min @70bar supply differential pressure

Max Working Pressure:P/A/B main ports 350bar rated; internal T drain ≤210bar; external Y drain full 350bar working pressureMoog Inc.

100% Full Stroke Step Response:≤39ms under nominal 210bar supply pressure

Control Accuracy:Hysteresis＜0.35%FS, Resolution＜0.095%FS, total thermal drift(-20~+80℃)＜3.0%FS

Null Leakage:0.45~2.30 L/min based on factory spool machining tolerance

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

Net Weight:5.52kg

Electrical Parameters

Input Power Supply:24VDC wide input(18~32VDC), quiescent standby current ≤950mA

Default Control Signal:Factory standard ±10VDC differential analog input; ±10mA /4~20mA current signal available via factory special modification

Connector:11-pin circular aviation receptacle, IP65 protection after complete cable assembly

EMC Standard:Compliant with EN55011 industrial electromagnetic compatibility specification

Port & Connection Configuration

Hydraulic Interface:ISO4401 NG25 standard hole layout including P supply port, A/B actuator control ports, separated built-in T internal drain and dedicated Y external drain; original NBR mounting gasket pre-installed from factory, standard X pilot port blocked with factory plug for non-external pilot oil setup

Electrical Interface:11-pin circular socket integrates 24V power supply, ±10V command signal and full-range LVDT feedback wiring; double-shielded control cable required with single-point cabinet grounding, no fieldbus communication function.

Core Functions

1.Patented ServoJet jet-pipe pilot provides superior anti-pollution property compared to traditional nozzle-flapper pilot, supporting long-term stable continuous operation under moderately contaminated hydraulic oil condition。

2.Medium-large flow customized four-way zero-lap spool realizes precise closed-loop regulation of position, speed and force for heavy-duty hydraulic system; onboard LVDT closed-loop dynamically compensates spool dimensional drift caused by wide ambient temperature fluctuation.

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

4.Factory fixed optimized amplifier gain matched for medium-heavy continuous load condition; ±10VDC analog input features strong anti-interference for long-distance wiring precision closed-loop control.

Typical Application

Medium-tonnage hydraulic forging press cylinder servo control, metallurgical strip mill roller positioning system, medium-size die-casting machine clamping & injection closed-loop control, hydraulic component durability fatigue test bench flow adjustment, heavy-duty ship hydraulic loading test equipment.

Installation & Maintenance Instructions

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

2.Arrange power cable and shielded control wire inside separated wiring ducts to avoid inverter harmonic interference to analog command signal; fasten valve with factory specified bolt torque and standard flat washers.

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

4.Seal unused spare T/Y drain ports with original factory blank plugs during spare part storage; store valve in dry dustproof warehouse to prevent NBR rubber seal ageing and subsequent oil leakage.