Model Code Definition

D662 = Base series for NG16 ISO4401-07 installation, ServoJet jet-pipe pilot and onboard integrated amplifier structure

Z4327 = Factory exclusive trim code defining fixed nominal flow, preset null offset, customized pilot component specification and locked amplifier gain parameters

K = Enhanced low-temperature optimized edition with improved internal flow paths and anti-drift electronic circuit for wide ambient temperature fluctuation

Technical Specifications

Hydraulic Parameters

Rated Flow: 254 L/min @35bar single land differential pressure; maximum 433 L/min under 70bar supply differential pressure

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

Full Stroke Step Response: ≤26.2ms at 210bar supply pressure

Control Accuracy: Hysteresis＜0.17%FS, Resolution＜0.07%FS, overall thermal drift (-20℃~+55℃)＜2.02%FS

Null Leakage: 0.49~3.05 L/min

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

Net Weight: 3.77kg

Electrical Parameters

Power Supply: 24VDC wide input (18~32VDC), static quiescent current ≤682mA

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

EMC Compliance: Complies with EN55011 industrial standard; 7-pin military circular connector with IP65 protection after cable assembly

Port & Connection Configuration

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

Control Mode: Pure analog closed-loop regulation, no digital fieldbus interface equipped

Core Functions

Patented ServoJet jet-pipe pilot delivers superior dirt resistance compared with conventional nozzle-flapper pilot to sustain stable continuous operation under moderately contaminated hydraulic fluid in harsh workshop conditions.

Onboard amplifier cooperates with full-spool LVDT closed-loop to automatically eliminate temperature-induced null shift; K upgraded circuit improves stability under low-temperature and varying ambient conditions.

Spring-centered fail-safe spool design: spool mechanically returns to neutral upon power failure to block A/B oil chambers and retain workpiece position for equipment safety protection.

Optimized internal flow passages keep consistent linear flow gain to support flexible switching among position, speed and pressure closed-loop control modes.

Typical Application

Large hot forging hydraulic press, automotive heavy sheet stamping production line, wide-strip steel mill tension control system, high-load hydraulic fatigue test bench, aerospace composite hot forming equipment, large tonnage injection molding clamping system.

Installation & Maintenance Instructions

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

Arrange power cables and shielded control wires in separate wiring ducts to avoid inverter harmonic interference on analog command signal.

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

Plug all unused hydraulic ports with dedicated blank plugs during spare storage; store inside dry dustproof warehouse to avoid FKM seal aging and fluid leakage.