Model Code Definition

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

1922 = Factory unique trim code, defines fixed rated flow, pre-calibrated null bias, locked amplifier gain and matched internal pilot assembly

E = Enhanced thermal drift compensation circuit, standard FKM fluororubber sealing for industrial medium temperature range

-4 = Custom option code: modified partial underlap spool + thicker valve body casting, optimized mounting flange for anti-shock & high vibration operating site

Technical Specifications

Hydraulic Parameters

Rated Flow:175 L/min @35bar single-land differential pressure; peak instantaneous flow 292 L/min @70bar supply differential pressure

Max Working Pressure:P/A/B main ports up to 350bar; internal T drain ≤50bar; standalone Y external drain withstand full 350bar rated pressureMoog Inc.

Full Stroke Step Response:≤22.2ms under standard 210bar supply pressure

Control Precision:Hysteresis＜0.17%FS, Resolution＜0.069%FS, overall thermal drift(-20~+60℃)＜2.02%FS

Null Leakage:0.45~2.88 L/min

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

Net Weight:3.05kg (extra 0.16kg vs standard E version due to "-4" reinforced body)

Electrical Parameters

Input Power:24VDC wide input(18~32VDC), static standby current ≤630mA

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

EMC Standard:Comply with EN55011 industrial EMC; 7-pin military circular connector, IP65 after complete cable wiring

Port & Connection Configuration

Hydraulic Interface:Standard ISO4401-05 NG10 mounting hole layout, separated P supply, A/B actuator control ports, built-in T internal drain + independent Y external drain; "-4" version with reinforced mounting bolt boss on valve bottom

Electrical Interface:7-pin circular receptacle integrating power, analog command and full-travel LVDT feedback; double-shielded control cable with single-point cabinet grounding

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

Core Functions

1.Patented ServoJet jet-pipe pilot delivers superior anti-contamination compared with nozzle-flapper structure, stable operation under moderately contaminated hydraulic fluidMoog Inc.。

2.E-type enhanced amplifier cooperates with full-range LVDT closed loop to automatically compensate temperature-induced null drift; "-4" reinforced structure improves anti-fatigue performance under continuous mechanical vibration。

3.Spring-centered fail-safe spool:automatically returns to neutral on power loss to block A/B oil passage and lock hydraulic actuator for equipment safety protection。

4.Partial modified underlap spool of "-4" option reduces startup impact flow, effectively suppress hydraulic shock during frequent reversing control。

Typical Application

Large-tonnage hydraulic forging press, heavy-duty steel slab rolling mill tension control, automobile hot stamping production line, high-load material fatigue test bench, large composite thermal forming hydraulic equipment, mine hydraulic servo driving unit.

Installation & Maintenance Instructions

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

2.Arrange power and shielded control wire inside independent wiring duct to avoid inverter harmonic interference on analog control signal; fix valve mounting bolts with spring lock washer for "-4" anti-vibration installation requirement。

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

4.Seal all unused hydraulic ports with dedicated blank plugs during spare storage; store inside dry dustproof warehouse to prevent FKM seal ageing and oil leakage。