Model Code Definition

D662 = NG16 ISO4401-07 mounting size, two-stage ServoJet jet-pipe pilot structure, onboard integrated amplifier servo valve base series;

4846 = dedicated performance specification code, defined fixed rated flow, spool overlap characteristic, factory preset null bias and flow gain parameter, separate inner T & outer Y drain configuration.

Technical Specifications

Hydraulic Parameters

Rated Flow: 250 L/min at 35bar differential pressure per single metering land; max bulk flow 435 L/min under 70bar supply differential pressure

Max Working Pressure: P/A/B main ports rated 350bar; internal T drain ≤50bar; independent external Y drain withstand up to 350bar

Dynamic Response: Full stroke 0~100% step response ≤27ms under 210bar supply pressure

Control Precision: Hysteresis＜0.18%FS, Resolution＜0.08%FS, full-range ambient thermal drift (-20℃~+55℃)＜2.2%FS

Null Leakage: 0.55~3.3 L/min

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

Net Weight: 3.82kgMoog Inc.

Electrical Parameters

Input Power Supply: 24VDC wide range input (18~32VDC), quiescent operating current ≤710mA

Standard Control Command: ±10VDC differential analog input; optional ±10mA / 4~20mA current input by special order

EMC Standard: Complies with EN55011 industrial electromagnetic compatibility; military circular electrical connector with IP65 protection grade

Port & Electrical Configuration

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

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

Communication Mode: Pure analog closed-loop control, no digital fieldbus interface equipped

Core Functions

Patented ServoJet jet-pipe pilot structure features superior dirt resistance vs conventional nozzle-flapper pilot, ensuring stable long-cycle operation under moderately polluted hydraulic fluid in harsh industrial environments.

Embedded drive amplifier matches full-stroke LVDT closed-loop feedback circuit to automatically compensate temperature-caused null drift, supporting non-stop 24-hour full-load continuous operation.

Standard spring-centered neutral spool design; spool automatically returns to center upon power loss to lock A/B oil chambers and fix load position for equipment fail-safe protection.

Linear optimized spool metering edge delivers steady flow gain, compatible with flexible switching among closed-loop position, speed and pressure control modes on single valve unit.

Typical Application

Heavy-duty hydraulic forging press, automotive large stamping production line, steel hot rolling mill tension control system, multi-channel hydraulic fatigue test bench, large tonnage injection molding clamping system, aerospace composite forming hydraulic machinery.

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 cable and shielded control wire inside independent wiring duct to avoid frequency converter harmonic interference on analog control signal.

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

Seal all unused hydraulic ports with dedicated blank plugs during long-term spare storage; store in dry dustproof warehouse to avoid rubber seal aging and unexpected fluid leakage