D633/D634 DIRECT DRIVE SERVOVALVES - Moog, Inc.

1 D633/D634 DIRECT DRIVE SERVOVALVESPROVEN TO RUN FASTER,POSITION BETTER ANDDRIVE THROUGH DIRT FORWOOD d633 and d634 Series are DirectDrive Valves (DDV) with electric closedloop spool position control. Thesevalves are throttle valves for 3-, 4-, and2x2 way applications. They are suitablefor electrohydraulic position, velocity,pressure and force control systems,including those with high dynamicresponse valve model numbers listed in thechart on the back were specificallydesigned to withstand the harshenvironment, vibration, and shock loadsfound in wood/lumber spool DRIVE device is a permanentmagnet linear force motor that canactively stroke the spool from its springcentered position in both is an advantage when compared toproportional solenoids with one forcedirection only.

2 The closed loop spoolposition electronics and pulse widthmodulated (PWM) DRIVE electronics areintegrated into the valve and require a24 VDC power for the Wood ProcessingIndustrynMoog s DIRECT DRIVE Valves (DDV)have spool driving forces that aretwice those of a servo solenoid valvenIncreased operation at limits (at highpressure drops)nDirectly driven by a permanentmagnet linear force motor with highforce levelnNo pilot oil flow requirednPressure independent dynamicperformancenLow hysteresis and low thresholdnLow current consumption at andnear hydraulic nullnStandardized spool positionmonitoring signal with low residualripplenElectric null adjust nCan be configured with an offsetfail-safe mode; with loss of supplyvoltage, broken cable or emergencystop, the spool shifts to apredetermined offset flow conditionWHAT MOVES YOUR WORLD Proportional solenoid systems requiretwo solenoids with more cabling for thesame function.

3 Another solution uses asingle solenoid, working against a case of current loss in the solenoid, thespring drives the spool to the end positionby passing through a fully open can lead to uncontrolled of the DIRECT DRIVE ValvesThe position control loop for the spool with position transducer and linear force motor isclosed by the integrated electronics. An electric signal corresponding to the desiredspool position is applied to the integrated electronics and produces a pulse widthmodulated (PWM) current to DRIVE the linear force motor. An oscillator excites the spoolposition transducer (LVDT) producing an electric signal proportional to spool demodulated spool position signal is compared with the command signal and theresulting spool position error causes current in the force motor coil until the spool hasmoved to its commanded position, and the spool position error is reduced to zero.

4 Theresulting spool position is thus proportional to the command Data DIRECT DRIVE ValvesDirect DRIVE Valve Hydraulic SymbolValve pressure drop p[bar]Flow rate Q [l/min] pmax= 350 bar (5000 psi)Flow Signal Characteristic CurveContact MoogAmericas +1-716-652-2000 Europe+49-7031-622-0 Pacific+81-463-553615 Model NumberType CodeNotesFlow (gpm @ 1000 psitotal drop)Flow (gpm @ 150 psitotal drop)Max Supply Pressure(on main stage)Null CutFail-SafeSeal TypeElec ConnInput CommandPower 0 to overlapSpool in Mid-PositionBuna7-Pin+/-10 VDC+24 VDCFor your nearest Moog location visit our 2007 Moog IndustrialAll rights reserved. For legal notices, 0 to overlapSpool in Mid-PositionBuna7-Pin+/-10 VDC+24 VDCD633-308BR08KO1M0 NSM2525000 Servo 0 to overlapSpool in Mid-PositionBuna7-Pin+/-10 VDC+24 VDCD633Z570BR16KO1M0 NSM2 Vibration resistantinternal connector1045000 Servo 0 to overlapSpool in Mid-PositionBuna7-Pin+/-10 VDC+24 VDCD634Z395CR24KO2M0 NSM2 Vibration resistantinternal connector1665000 Servo 0 to overlapSpool in Mid-PositionBuna7-Pin+/-10 VDC+24 VDCD634Z549AR40KO2M0 NSM2 Vibration resistantinternal connector26105000 Servo 0 to overlapSpool in Mid-PositionBuna7-Pin+/-10 VDC+24 VDCD634-1019P24KA6 MOVSM21665000 Proportional 0 to 3% overlapSpool in Mid-PositionFluorocarbon7-Pin+/-10 VDC+24

5 VDCD634-1003P40KA6 MOVSM226105000 Proportional 0 to 3% overlapSpool in Mid-PositionFluorocarbon7-Pin+/-10 VDC+24 VDCD634Z1044P60KA6 MOVSM2 Vibration resistantinternal connector42165000 Proportional 0 to 3% overlapSpool in Mid-PositionFluorocarbon7-Pin+/-10 VDC+24 VDC