Model Explanation

• D662：MOOG D660 series two-stage ServoJet servo valve with ISO4401-07 (NG16) standard installation dimension for medium-large flow

• 3303：Base specification code: rated flow 240 L/min@ΔP=35bar per single spool land, external independent X pilot oil supply, external Y drain design, zero-lap four-way spool layout

• K：ATEX explosion-proof construction with Ex d IIC T6 certification, explosion-proof encapsulated internal drive amplifier

• P01：Control signal definition: differential ±10VDC analog input standard configuration

• H：Upgraded pressure rating: main P/A/B ports rated for maximum working pressure 315bar

• L：Fail-safe feature: mechanical spring auto-centering upon power failure, spool returns to neutral mid-position to lock actuator

• M：Built-in non-contact LVDT spool displacement closed-loop feedback inside valve body

• F：Standard 6+PE circular aviation electrical connector specification

• 6：Zero overlap spool, linear flow gain at null position

• N：Fluorine high-temperature resistant FKM sealing material upgrade

• E：Enhanced EMC reinforced anti-interference circuit design

• C2：Customized factory null offset preset and special internal machining tolerance

• 0：Standard finished product without extra optional auxiliary fittings

Technical Specifications

Hydraulic Parameters

• Rated Flow: 240 L/min (@ΔP=35bar per single spool land)

• Max Working Pressure: P/A/B main ports:315bar; external Y drain T port:350bar

• Pilot Mode: External independent X pilot inlet, external Y drain returning to tank

• Working Medium: Mineral hydraulic oil complying with DIN51524/ISO11158, recommended cleanliness NAS6~7

• Net Weight: Approx7.7kg

• Fail-safe Property: Mechanical return spring automatically centers spool at neutral position when power cuts off

Electrical Parameters

• Power Supply: DC24V (18～32VDC), total power consumption ≤44W

• Control Signal: Differential ±10VDC analog input

• Full Stroke Step Response(0~100% stroke, supply pressure210bar):13~17ms

• Electrical Connector: Standard 6+PE circular explosion-proof industrial plug

• Built-in Protection: Overcurrent, short-circuit and reverse polarity protection; explosion-proof certified internal circuit

Environmental Conditions

• Operating Temperature: -20℃～+75℃; Storage & Transportation:-40℃～+88℃

• Humidity:5%~95%RH non-condensing; compliant with EN61000 EMC and ATEX explosion-proof industrial standards

• Protection Grade: Connector IP65, valve body IP54 with explosion-proof enclosure

Channel & Feedback Configuration

• Hydraulic Port: Standard 4-way P/A/B/T layout following ISO4401-07 manifold dimension, independent external X pilot port and external Y drain port reserved

• Feedback Mode: Built-in high-precision non-contact internal LVDT sensor for real-time spool closed-loop feedback without external mechanical feedback rod

Communication & Interface Configuration

• Control Wiring: Shielded analog hardwire connection with D137 analog output channel of MSCⅡ control system; control instructions configured via MACS programming software and transmitted by screened signal cables

• Auxiliary Interface: Side-mounted zero trimming potentiometer for field on-site zero-offset calibration; only analog hardwire control mode, no onboard EtherCAT or Profibus fieldbus interfaces

Core Function

1. Convert analog control signals from D136 main controller into large proportional hydraulic flow to drive heavy-load hydraulic cylinders and hydraulic motors for precise closed-loop regulation of position, motion speed and test load.

2. Internal LVDT collects real-time spool actual position and feeds back to explosion-proof integrated amplifier to form inner closed loop inside valve, improving control linearity and suppressing zero drift induced by oil temperature and supply pressure fluctuation.

3. Built-in multi-protection amplifier outputs fault alarm signals which can be collected by D137 digital input channels for system interlock protection and fault warning.

4. Power-off spring centering design ensures actuator locking to avoid runaway risk for explosion-proof industrial equipment safety.

5. FKM high-temperature sealing and explosion-proof structural design adapt to harsh high-temperature and explosive hazardous working environment; preset factory zero offset reduces field calibration workload.

Applicable Scenarios

Instructions for Installation and Maintenance

1. Mount on standard ISO4401-07 hydraulic manifold in horizontal or vertical orientation; prohibit installation in uncertified explosive area beyond valve ATEX grade, keep away from dense oil mist and splashing water.

2. Install 3μm high-pressure precision filters at upstream of P main inlet and X pilot supply port to prevent ServoJet pilot nozzle clogging from hydraulic impurities.

3. Retighten all explosion-proof electrical terminals every six months; separate shielded analog control cables from high-power power cables inside wiring ducts to reduce electromagnetic interference.

4. Complete full-range zero calibration once per year; regularly inspect all hydraulic ports for leakage and replace FKM sealing parts when abnormal leakage occurs.

5. Restrict 24VDC power supply fluctuation within ±10% rated voltage; overvoltage will permanently damage internal explosion-proof amplifier board.