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 onboard servo amplifier configuration

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

H：High-response optimization upgrade, optimized pilot flow channel & internal amplifier PID parameter tuning, shortened full-stroke step response time, high dynamic type customization

Technical Specifications

Hydraulic Parameters

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

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

Pilot Mode：External X pilot oil inlet, internal Y tank drain

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

Net Weight：Approx5.7kg

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

Electrical Parameters

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

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

Step Response(0~100% full stroke, supply pressure210bar):5～9ms (faster than standard G version 7~12ms due to H high-response optimization)

Electrical Connector：12-pin circular industrial plug

Environmental Conditions

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

Humidity：5%~95%RH non-condensing; fully conforms to EN61000 industrial EMC anti-interference standard

Protection Grade：Connector IP65, valve body IP54

Channel & Feedback Configuration

Hydraulic Port：Standard 4-way P/A/B/T layout complying with ISO4401-05 manifold mounting dimension

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

Auxiliary Port：Independent external X pilot oil supply port, fixed internal Y drain defined by model coding

Communication & Interface Configuration

Control Wiring：Shielded analog hardwire connection with D137 analog output channel of MSCⅡ control system; control instructions edited on MACS programming software and transmitted to servo valve via signal cable

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

Core Function

Convert analog control signal from D136 main controller into proportional hydraulic flow to drive hydraulic cylinder/motor for high-speed closed-loop regulation of equipment position, motion speed and test load force; H high-response design meets rapid dynamic loading requirements of fatigue test benches.

Built-in LVDT collects real spool position and feeds back to onboard amplifier to form valve inner closed loop, improves control linearity and suppress zero drift caused by oil temperature and supply pressure fluctuation.

Integrated amplifier with short-circuit & overcurrent protection; valve fault signal can be collected by D137 DI channel for master control interlock and fault alarm.

Mechanical spring fail-safe structure: spool auto-centering after power failure to lock actuator position, avoid equipment out-of-control accident for test safety.

Side zero-adjust potentiometer compensates installation deviation and oil contamination-induced zero shift; H optimized internal structure realizes quicker dynamic following for high-frequency cyclic test working condition.

Applicable Scenarios

High-frequency fatigue load control for automobile chassis/suspension component test bench; rapid position switching control of aerospace hydraulic actuator test rig; dynamic pressure closed-loop regulation of steam turbine EH speed governing system; high-speed precision forming of hydraulic press; dynamic impact & fatigue performance test of new composite material testing machine.

Instructions for Installation and Maintenance

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

Install 3μm high-pressure filter at P port upstream to prevent ServoJet pilot nozzle clogging by hydraulic impurities.

Inspect and retighten all electrical terminals every six months to eliminate signal jitter from loose wiring; separate shielded analog cable from high-power power cable for EMI reduction.

Complete valve zero calibration annually; periodically inspect A/B/T port external leakage, replace sealing parts when abnormal leakage appears.

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