Model Explanation

• D661: Core product series of ISO05 standard two-stage integrated electronic servo valve of MOOG D660 platform

• Z: Internal integrated closed-loop LVDT spool displacement feedback + built-in servo drive amplifier type

• 2704G: Custom flow grade, pilot structure, feedback form, signal specification and fail-safe configuration coding of this single model

Technical Specifications

Hydraulic Parameters

• Rated Flow: 70 L/min @ ΔP=35bar per spool land (custom calibrated by 2704 coding)

• Max Working Pressure: P/A/B port 350bar(5000PSI); T port with internal Y drain:210bar(3000PSI); external Y drain:350bar(5000PSI)Moog Inc.

• Working Medium: Mineral hydraulic oil conforming to DIN51524/ISO11158, recommended cleanliness NAS 6~7

• Valve Weight: Approx 5.7kg

Electrical Parameters

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

• Standard Control Command Signal: ±10VDC differential analog input (optional ±10mA/4-20mA per customization)

• Step Response Time(0~100% stroke,210bar supply):7.5~11ms

• Electrical Connector: Standard 6+PE circular industrial plug connectorMoog Inc.

Environmental Conditions

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

• Humidity: 5%~95%RH non-condensing; fully complies with EN61000 industrial EMC anti-interference standardMoog Inc.

• Protection Grade: IP65 for electrical connector part, valve body IP54

Channel & Feedback Configuration

• Hydraulic Port: Standard 4-way P/A/B/T port layout per ISO4401-05 mounting pattern

• Feedback Mode: Built-in high-precision LVDT displacement sensor for real-time spool position closed-loop feedback inside valve body, no external feedback rod required

• No extra external pilot oil inlet port(X); Y drain port configurable for internal/external drainage as per 2704G coding

Communication & Interface Configuration

• Control Connection: Direct wired connection with D137 series IO expansion module of MSCⅡ control system via analog signal cable; analog command transmitted from MACS programming software through D137 analog output channel to servo valve

• Auxiliary Interface: Reserved zero-adjustment potentiometer on valve side panel for on-site null trimming; no fieldbus(EtherCAT/Profibus) onboard, analog hardwire control only

Core Function

1. Convert analog control signal output from MSCⅡ D136 main controller into proportional hydraulic flow to drive hydraulic cylinder/motor, realizing closed-loop position, speed and pressure precise regulation for test equipment

2. Internal LVDT real-time collects spool actual position and feeds back to built-in amplifier to form valve internal closed loop, improving control linearity and restraining zero drift caused by oil temperature and pressure fluctuationMoog Inc.

3. Built-in short-circuit overcurrent protection circuit for drive amplifier; fault signal can be collected by D137 digital input channel for fault alarm and logic interlock of master control system

4. Zero position adjustable via side potentiometer to adapt on-site oil contamination and installation deviation; optional fail-safe spool centering function upon power loss per 2704G design

Applicable Scenarios

Instructions for Installation and Maintenance

1. Mount on standard ISO4401-05 manifold block, install vertically or horizontally; avoid mounting in high oil mist, splash water and high-temperature radiation area

2. Strictly control hydraulic oil cleanliness; install 3μm high-pressure filter upstream of valve P port to prevent particle clogging of ServoJet pilot nozzle

3. Check wiring terminal tightening status every six months, prevent wiring looseness causing signal jitter; prohibit mixing analog control cable with high-power power cable in same wire duct for anti-interference

4. Conduct valve zero trimming once per year; inspect internal oil leakage of A/B/T port regularly, replace sealing parts when obvious leakage occurs

5. Keep 24VDC power supply fluctuation within ±10% rated voltage range; abnormal overvoltage will damage internal integrated amplifier board of servo valve