Model Code Definition

D662 = NG16 ISO4401-07 mounting dimension, ServoJet jet-pipe pilot, built-in integrated amplifier base model

Z4334 = Exclusive factory flow trim code, defines fixed rated flow, preset null offset, customized pilot assembly and standard amplifier gain setting; no K suffix means standard ambient temperature circuit without low-temperature optimized modification

Technical Specifications

Hydraulic Parameters

Rated Flow: 262 L/min @35bar single edge differential pressure; max 442 L/min at 70bar supply differential pressure

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

Full Stroke Step Response: ≤26.8ms under 210bar supply pressure

Control Accuracy: Hysteresis＜0.18%FS, Resolution＜0.072%FS, overall thermal drift (-20℃~+55℃)＜2.10%FS

Null Leakage: 0.52~3.15 L/min

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

Net Weight: 3.78kg

Electrical Parameters

Power Input: 24VDC wide range supply (18~32VDC), static quiescent operating current ≤690mA

Standard Command Input: ±10VDC differential analog signal; ±10mA / 4~20mA current input available by special factory order

EMC Standard: EN55011 industrial compliance; 7-pin military circular connector with IP65 protection after cable installationMoog Inc.

Port & Connection Configuration

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

Electrical Interface: 7-pin military circular receptacle integrating power supply, analog setpoint and full-range LVDT feedback wiring; double-shielded control cable with single-point cabinet grounding; pure analog closed-loop control without fieldbus interface

Core Functions

Patented ServoJet jet-pipe pilot features superior anti-contamination compared to conventional nozzle-flapper design for steady long-run operation under slightly contaminated hydraulic oil in rugged workshop environments.

Built-in amplifier cooperates with full-spool LVDT closed loop to automatically compensate normal ambient temperature-induced null drift; standard circuit design for regular indoor operating environment.

Mechanical spring-centered fail-safe spool: automatically returns to neutral upon power failure to seal A/B oil chambers and lock load position for equipment safety protection.

Optimized internal flow channel maintains linear flow gain, supports seamless switching among position, velocity and pressure closed-loop control modes.

Typical Application

Large hot forging hydraulic press, automotive heavy plate stamping line, steel strip rolling mill tension control system, hydraulic component endurance test bench, medium-tonnage composite material hot-pressing equipment, large die-casting machine clamping hydraulic system.

Installation & Maintenance Instructions

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

Separate high-power power cables and shielded control wires inside different wiring ducts to avoid frequency converter harmonic interference to analog control signal.

Null bias and flow gain 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.

Seal all unused hydraulic ports with dedicated blank plugs during spare storage; store inside dry dustproof warehouse to prevent FKM fluororubber seal ageing and oil leakage.