Model Code Definition

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

Z4334 = Exclusive factory trim code defining fixed nominal flow rating, preset null offset, customized pilot component specification and locked amplifier gain parameters

K = Low-temperature upgraded variant with optimized internal oil gallery and anti-drift electronic circuit for wide ambient temperature fluctuation

Technical Specifications

Hydraulic Parameters

Rated Flow: 262 L/min @35bar single land differential pressure; Max flow 442 L/min under 70bar supply differential pressure

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

Full Stroke Step Response: ≤26.3ms at 210bar supply pressure

Control Accuracy: Hysteresis＜0.17%FS, Resolution＜0.07%FS, total thermal drift (-20℃~+55℃)＜2.03%FS

Null Leakage: 0.49~3.06 L/min

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

Net Weight: 3.78kg

Electrical Parameters

Power Supply: 24VDC wide input range (18~32VDC), static quiescent current ≤686mA

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

EMC Compliance: Conforms to 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 control ports, built-in internal T drain port, standalone 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 grounding at control cabinet terminal

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

Core Functions

Patented ServoJet jet-pipe pilot delivers superior contamination resistance compared with conventional nozzle-flapper pilot to guarantee steady continuous operation under moderately contaminated hydraulic fluid in harsh workshop environments.

Onboard amplifier matches full-spool LVDT closed-loop to automatically offset temperature-induced null shift; K optimized circuit improves stability under low-temperature and variable ambient conditions.

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

Optimized internal flow passage maintains consistent linear flow gain, supporting flexible switching among position, velocity and pressure closed-loop control modes.

Typical Application

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

Route power cables and shielded control wires inside 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 fine 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 prevent FKM fluororubber seal ageing and hydraulic fluid leakage.