Model Code Definition

D662 = Base series with NG16 ISO4401-07 mounting dimension, ServoJet jet-pipe pilot structure and embedded integrated amplifier

Z4334 = Exclusive factory calibration code for fixed rated flow, preset null offset, customized pilot components and locked amplifier gain

K = Special upgraded version: optimized internal oil passage and enhanced anti-temperature-drift electronic circuit for fluctuating low & high ambient conditions

Technical Specifications

Hydraulic Parameters

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

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

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

Control Accuracy: Hysteresis＜0.17%FS, Resolution＜0.07%FS, full-range 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 fluid temperature -20℃~+80℃

Net Weight: 3.78kg

Electrical Parameters

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

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 control ports, built-in internal T drain port, independent Y external 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 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 anti-contamination capacity versus conventional nozzle-flapper pilot, enabling stable continuous operation under moderately contaminated hydraulic oil in harsh industrial environments.

Full-spool LVDT closed-loop matches onboard amplifier to automatically compensate temperature-caused null drift; K modified circuit improves operational stability under severe ambient temperature swing.

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

Optimized internal flow runner maintains stable linear flow gain to support flexible switching among position, velocity and pressure closed-loop control modes.

Typical Application

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

Arrange power cables and shielded control wires inside separated wiring ducts to avoid inverter harmonic interference on analog control signals.

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

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