Model Explanation

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

• Z：Built-in LVDT spool displacement closed-loop feedback + integrated servo drive amplifier configuration

• 2712：Custom coding: rated flow 80L/min@ΔP=35bar per land, external X pilot oil supply, internal Y drain, power-off mechanical spring spool centering fail-safe function, 12-pin circular electrical connector

• G：NBR high-temperature resistant customized sealing upgrade, enhanced oil compatibility for long-term continuous working condition

Technical Specifications

Hydraulic Parameters

• Rated Flow: 80 L/min (@ΔP=35bar per single spool land)

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

• Pilot Configuration: External X pilot oil inlet, internal Y drain back to tank

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

• Valve Net Weight: Approx 5.7kg

• Fail-safe Feature: Power-loss mechanical spring auto-centering, spool returns to neutral zero position

Electrical Parameters

• Power Supply: DC24V (18～32VDC), total power consumption ≤33W

• Standard Control Command: Differential ±10VDC analog input; optional ±10mA current signal customization

• Step Response Time (0~100% full stroke, supply pressure 210bar):7～12ms

• Electrical Connector: 12-pin circular industrial plug (standard for 2712G coding)

Environmental Conditions

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

• Humidity:5%~95%RH non-condensing; fully complies 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 ISO4401-05 manifold installation dimension

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

• Auxiliary Hydraulic Port: Independent external X pilot oil supply port, fixed internal Y drain design by model definition

Communication & Interface Configuration

• Control Wiring: Hardwire analog signal connection with D137 analog output channel of MSCⅡ control system; control instructions downloaded from MACS programming software and transmitted to servo valve via shielded analog cable

• Auxiliary Interface: Null trimming potentiometer reserved on side panel for on-site zero offset calibration; no onboard EtherCAT/Profibus fieldbus, only analog hardwire control mode

Core Function

1. Convert analog control signal output from D136 main controller into proportional hydraulic flow to drive hydraulic cylinder/motor for precision closed-loop regulation of equipment position, movement speed and test loading force.

2. Internal LVDT collects real-time spool actual position and feeds back to onboard amplifier to form valve inner closed loop, improves control linearity and restrains zero drift caused by oil temperature and supply pressure fluctuation.

3. Integrated amplifier with built-in short-circuit & overcurrent protection; valve fault signal can be picked up via D137 DI channel for master control fault alarm and equipment interlock protection.

4. Mechanical fail-safe spring design: spool automatically returns middle position after power failure to lock hydraulic actuator, effectively avoid equipment runaway risk for test bench safety.

5. Side zero-adjust potentiometer compensates installation deviation and oil contamination-induced zero shift; G-grade upgraded seal prolong service life under high-temperature hydraulic oil environment.

Applicable Scenarios

Instructions for Installation and Maintenance

1. Mount on standard ISO4401-05 hydraulic manifold; horizontal/vertical installation allowed, avoid installing in cabinet area with hydraulic oil mist, water splash and high ambient heat radiation.

2. Install 3μm high-pressure filter on upstream of P port to prevent ServoJet pilot nozzle blockage from hydraulic solid impurities.

3. Inspect and retighten all electrical terminals every six months to prevent loose wiring causing signal jitter; separate shielded analog control cable from high-power power cable inside wiring duct to reduce EMI interference.

4. Complete valve zero calibration once per year; periodically inspect external leakage of A/B/T ports, replace G-spec sealing parts when abnormal leakage occurs.

5. Keep input 24VDC power supply fluctuation within ±10% rated voltage range; overvoltage will permanently damage internal integrated amplifier board.