Model Explanation

D662: MOOG D660 series two-stage integrated electronic servo valve with ServoJet pilot, ISO4401-07 (NG16) installation specification for medium & large flow

2801: Base specification coding: rated flow 320L/min@ΔP=35bar per single spool land, internal X pilot oil supply, internal Y drain back to T port, 11-pin circular electrical connector

C: Zero-lap four-way spool, standard NBR rubber sealing, mechanical spring auto-centering upon power loss with fail-safe mid-position locking function

Technical Specifications

Hydraulic Parameters

Rated Flow: 320 L/min (@ΔP=35bar per single spool land)

Max Working Pressure: P/A/B main ports:350bar(5000PSI); internal Y drain T port:210bar(3000PSI)

Pilot Mode: Internal pilot oil taken from main P passage, internal Y drain inside valve body without external pilot pipeline

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

Net Weight: Approx7.5kg

Fail-safe Property: Mechanical return spring pulls spool back to neutral zero automatically after power failure to lock actuator position

Electrical Parameters

Power Supply: DC24V(18～32VDC), total power consumption ≤43W

Control Signal: Differential ±10VDC analog input; ±10mA current signal available for optional customization

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

Electrical Connector: 11-pin circular industrial plug

Built-in Protection: Overcurrent, reverse polarity and short-circuit protection for onboard amplifier

Environmental Conditions

Operating Temperature: -20℃～+70℃; Storage & Transportation:-40℃～+85℃

Humidity:5%~95%RH non-condensing; compliant with EN61000 industrial EMC anti-interference standard

Protection Grade: Electrical connector IP65, valve body IP54

Channel & Feedback Configuration

Hydraulic Port: Standard 4-way P/A/B/T layout following ISO4401-07 manifold installation dimension; X pilot supply and Y drain are all internally arranged inside valve body

Feedback Mode: Built-in high-precision non-contact internal LVDT displacement sensor for real-time spool closed-loop feedback, no external mechanical feedback rod required

Communication & Interface Configuration

Control Wiring: Shielded analog hardwire connection with D137 analog output channel of MSCⅡ control system; control instructions compiled via MACS programming software and transmitted through screened signal cable

Auxiliary Interface: Side-mounted zero trimming potentiometer for on-site zero-offset calibration; only analog hardwire control available without onboard EtherCAT or Profibus fieldbus interfaces

Core Function

Convert analog control signals from D136 main controller into large proportional hydraulic flow to drive heavy-duty hydraulic cylinder and hydraulic motor for precise closed-loop regulation of position, movement speed and test load.

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

Abnormal fault signal triggered by amplifier protection circuit can be collected by D137 digital input channel to realize system fault alarm and safety interlock protection.

Power-off spring centering design effectively prevents heavy-load actuator runaway and improves overall operation safety of large-scale test equipment.

Side zero-adjust potentiometer compensates zero shift resulting from installation error and slight hydraulic oil contamination.

Applicable Scenarios

Precision forming control of large-tonnage hydraulic press; heavy-duty fatigue durability test for engineering machinery and automobile oversized structural components; hydraulic thickness control of metallurgical rolling mill; static and dynamic performance test for large-bore aerospace hydraulic actuator; high-flow electro-hydraulic closed-loop control for new material compression test equipment.

Instructions for Installation and Maintenance

Install on standard ISO4401-07 hydraulic manifold in horizontal or vertical mounting way; avoid installation in areas with dense oil mist, splashing water and high-temperature thermal radiation.

Install 3μm high-pressure precision filter at upstream of P main oil inlet to prevent ServoJet pilot nozzle blockage by hydraulic impurities.

Retighten all electrical wiring terminals every six months; separate shielded analog control cable from high-power power cable inside wiring duct to reduce electromagnetic interference.

Complete full-range zero calibration of the servo valve once per year; regularly inspect external leakage of all hydraulic ports and replace NBR sealing components in case of abnormal leakage.

Keep input 24VDC power supply fluctuation within ±10% of rated voltage; overvoltage will cause permanent damage to internal integrated amplifier board.