Model Code Definition

D662 = Base series code for NG16 ISO4401-07 mounting, two-stage ServoJet pilot structure and onboard integrated amplifier servo valve

5399 = Custom specification code defining fixed rated flow, zero-overlap linear spool geometry, preset null offset, flow gain and fixed dual T/Y drain configuration.

Technical Specifications

Hydraulic Parameters

Rated Flow: 360 L/min at 35bar single metering land pressure drop; maximum bulk flow 590 L/min under 70bar supply differential pressure

Max Working Pressure: P/A/B main control ports rated 350bar; internal T drain ≤50bar; standalone external Y drain supports full 350bar operating pressureMoog Inc.

Dynamic Response: Full stroke 0~100% step response ≤30.8ms at 210bar supply oil pressure

Control Accuracy: Hysteresis＜0.22%FS, Resolution＜0.09%FS, ambient thermal drift (-20℃~+55℃)＜2.6%FS

Null Leakage: 0.70~3.85 L/min

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

Net Weight: 3.98kg

Electrical Parameters

Input Power Supply: 24VDC wide input range (18~32VDC), no-load quiescent operating current ≤780mA

Standard Control Command: ±10VDC differential analog input; optional ±10mA or 4~20mA current signal available via special order

EMC Standard: Complies with EN55011 industrial electromagnetic compatibility standard; 7-pin military circular connector with IP65 ingress protection rating.

Port & Electrical Configuration

Hydraulic Interface: Standard ISO4401-07 NG16 hole arrangement, P supply port, A/B actuator control ports, internal T drain port and independent external Y drain port

Electrical Interface: 7-pin military circular receptacle integrating power supply, analog command and full-range LVDT feedback wiring; double-shielded control cable with single-point cabinet grounding

Communication Mode: Pure analog closed-loop regulation, no built-in digital fieldbus communication interface.

Core Functions

Patented ServoJet jet-pipe pilot outperforms traditional nozzle-flapper pilot in anti-blocking performance, enabling stable uninterrupted long-term operation under moderately contaminated hydraulic fluid in rugged production environments.

Embedded drive amplifier cooperates with full-travel LVDT closed-loop feedback circuit to automatically compensate temperature-caused null drift, supporting 24-hour continuous full-load running.

Standard spring-centered neutral spool structure; spool mechanically resets to middle position upon power failure to isolate A/B oil chambers and lock load position for equipment fail-safe protection.

Precision linear spool metering edge maintains stable flow gain, enabling flexible switching among closed-loop position, speed and pressure control modes on single valve assembly.

Typical Application

Large hot forging hydraulic press, heavy automotive sheet stamping production line, steel hot rolling mill strip tension regulating system, high-power multi-channel hydraulic fatigue test bench, large-tonnage injection molding clamping hydraulic unit, aerospace composite thermal forming hydraulic equipment.

Installation & Maintenance Instructions

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

Separate high-current power cables and shielded control wires into independent wiring ducts to avoid frequency converter harmonic interference to analog control signals.

Null bias and flow gain parameters are fully pre-calibrated at factory; only minor on-site potentiometer fine trimming permitted; complete disassembly of ServoJet pilot module and main spool assembly is strictly forbidden.

Seal all unused hydraulic ports with standard blank plugs during long-term spare storage; store inside dry dustproof warehouse to prevent rubber seal ageing and unexpected fluid leakage.