Model Code Definition

D662 = NG16 ISO4401-07 installation dimension, ServoJet jet-pipe pilot structure, integral internal drive amplifier 2-stage servo valve series

4831 = unique performance specification code; rated flow 230 L/min @ ΔP=35bar per single metering land, separate inner T return oil and standalone Y external drain design with fixed factory null offset and flow gain parameters, critical lap linear spool profile.

Technical Specifications

Hydraulic Parameters

Rated Flow: 230 L/min at 35bar differential pressure per single control land; peak flow 412 L/min under 70bar supply differential pressure

Max Working Pressure: P/A/B main working ports 350bar; built-in internal T drain ≤50bar; independent external Y drain up to 350barMoog Inc.

Dynamic Response: Full stroke 0~100% step response ≤26.5ms at 210bar supply pressure

Control Accuracy: Hysteresis＜0.17%FS, Resolution＜0.09%FS, full-range thermal drift (-20℃~+55℃)＜2.1%FS

Null Leakage: 0.52~3.1 L/min

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

Net Weight: 3.78kg

Electrical Parameters

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

Standard Control Command Signal: ±10VDC differential analog input; optional ±10mA /4~20mA current control upon customized order

EMC Compliance: Conforms to EN55011 industrial EMC standard, military circular electrical connector with IP65 ingress protection rating.

Port & Communication Configuration

Hydraulic Interface: Standard ISO4401-07 NG16 mounting hole layout; P supply port, internal T drain port, A/B actuator control ports, 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 terminal

Communication Mode: Pure analog closed-loop regulation, no fieldbus digital communication interface equipped.

Core Functions

Patented ServoJet jet-pipe pilot construction delivers superior contamination resistance compared with traditional nozzle-flapper pilot, enabling long-term stable continuous operation under moderately contaminated hydraulic fluid in harsh production environments.

Onboard integrated drive amplifier matches full-spool LVDT closed-loop feedback circuit to automatically compensate temperature-induced null drift, supporting nonstop 24-hour full-load continuous operation.

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

Optimized internal flow channel design maintains outstanding linear flow gain, compatible with flexible switching among closed-loop position, velocity and pressure control modes on single valve body.

Typical Application

Heavy-duty hot forging hydraulic press, large automotive sheet metal stamping production line, wide-strip hot rolling mill tension regulating system, high-load multi-channel hydraulic fatigue test bench, oversized clamping unit of large tonnage injection molding machine, aerospace composite material hot forming hydraulic equipment.

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-power power cables and shielded control wires into independent wiring ducts to avoid frequency converter harmonic interference against analog control signal.

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

Seal all unused hydraulic ports with dedicated blank plugs during long-term spare part storage; store inside dry dustproof warehouse to prevent rubber seal aging and accidental oil leakage.