Model Code Definition

D663 = Base series: ISO4401-05 NG10 mounting dimension, ServoJet jet-pipe pilot, embedded integrated amplifier + full-range LVDT spool position feedback

306 = Factory unique trim code, defines fixed rated flow, pre-calibrated null bias, locked amplifier gain and matched internal pilot assembly

K = Dual definition: intrinsically safe explosion-proof electronic design for Class I/II hazardous site + rated max working pressure up to 350bar, FKM fluororubber full sealing set for harsh chemical & high-pressure environment

Technical Specifications

Hydraulic Parameters

Rated Flow:98 L/min @35bar single-side differential pressure; peak instantaneous flow 165 L/min @70bar supply differential pressure

Max Working Pressure:P/A/B main control ports up to 350bar; internal T drain ≤50bar; standalone Y external drain tolerates full 350bar pressure

Full Stroke Step Response:≤22.5ms under standard 210bar supply oil pressure

Control Precision:Hysteresis＜0.18%FS, Resolution＜0.07%FS, total thermal drift(-20~+60℃)＜2.1%FS

Null Leakage:0.42~2.75 L/min

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

Net Weight:3.12kg (explosion-proof K-type reinforced casing adds extra weight vs standard non-explosion model)

Electrical Parameters

Input Power Supply:24VDC intrinsically safe limited power input(18~32VDC), static standby current ≤580mA with intrinsic safety circuit current limiting design

Standard Command Signal:±10VDC differential analog input; ±10mA /4~20mA current signal available via factory customized order; all internal coil & PCB components comply with Ex ia intrinsic safety standard

EMC & Explosion Standard:Comply with EN55011 EMC and ATEX/IECEx intrinsic safety certification; 7-pin explosion-proof military circular connector, IP65 full protection after cable installation

Port & Connection Configuration

Hydraulic Interface:Standard ISO4401-05 NG10 mounting hole layout, separated P supply port, A/B actuator control ports, built-in T internal drain and independent Y external drain port; K version with explosion-proof sealed port plug fittings

Electrical Interface:7-pin flameproof circular receptacle integrating power supply, analog command and full-stroke LVDT feedback wiring; double-shielded intrinsic safety dedicated control cable with single-point cabinet grounding, must connect with certified safety barrier for field installation

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

Core Functions

1.Patented ServoJet jet-pipe pilot delivers outstanding anti-contamination performance compared to conventional nozzle-flapper structure, ensuring stable long-cycle operation under moderately contaminated hydraulic medium.

2.K-type intrinsic safety circuit restricts maximum input power & internal coil energy to eliminate ignition risk in explosive gas/dust environment, meanwhile withstand full 350bar system pressure for high-load hydraulic system.

3.Spring-centered fail-safe spool structure:main spool automatically returns to neutral position upon power failure to block A/B oil channel and lock hydraulic actuator for equipment safety protection.

4.Zero-lap spool maintains excellent linear flow gain, supports flexible switching among position, velocity and pressure three closed-loop control modes under explosion-proof working condition.

Typical Application

Petrochemical process hydraulic actuator, offshore oil platform hydraulic control unit, coal mine underground hydraulic test bench, chemical plant reactor servo drive, hazardous area fuel gas equipment precision hydraulic forming machine, refinery pressure regulation hydraulic system.

Installation & Maintenance Instructions

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

2.For K explosion-proof variant: install certified intrinsic safety isolation barrier between valve and control cabinet, separate power cable and shielded control wire in independent explosion-proof wiring troughs to avoid harmonic interference and explosion hidden danger.

3.Null bias and flow gain are fully pre-calibrated at MOOG original factory; only minor on-site potentiometer fine adjustment permitted; full disassembly of ServoJet pilot and main spool assembly is strictly forbidden to avoid damaging intrinsic safety structure.

4.Seal all unused hydraulic ports with dedicated explosion-proof blank plugs during spare parts storage; store inside dry dustproof explosion-proof warehouse to prevent FKM seal ageing and hydraulic fluid leakage.