d633/d634 direct drive servovalves€¦ · d633/d634 direct drive servovalves proven to run faster,...

D633/D634 DIRECT DRIVE SERVOVALVES

PROVEN TO RUN FASTER,POSITION BETTER ANDDRIVE THROUGH DIRT FORWOOD PROCESSING.

The 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 requirements.

The valve model numbers listed in thechart on the back were specificallydesigned to withstand the harshenvironment, vibration, and shock loadsfound in wood/lumber processingplants.

The spool drive device is a permanentmagnet linear force motor that canactively stroke the spool from its springcentered position in both directions.This is an advantage when compared toproportional solenoids with one forcedirection only. The closed loop spoolposition electronics and pulse widthmodulated (PWM) drive electronics areintegrated into the valve and require a24VDC power supply.

Benefits for the Wood ProcessingIndustry

n Moog’s Direct Drive Valves (DDV)have spool driving forces that aretwice those of a servo solenoid valve

n Increased operation at limits (at highpressure drops)

n Directly driven by a permanentmagnet linear force motor with highforce level

n No pilot oil flow requiredn Pressure independent dynamic

performancen Low hysteresis and low thresholdn Low current consumption at and

near hydraulic nulln Standardized spool position

monitoring signal with low residualripple

n Electric null adjust n Can be configured with an offset

fail-safe mode; with loss of supplyvoltage, broken cable or emergencystop, the spool shifts to apredetermined offset flow condition

WHAT MOVES YOUR WORLD

Proportional solenoid systems requiretwo solenoids with more cabling for thesame function. Another solution uses asingle solenoid, working against a spring.In case of current loss in the solenoid, thespring drives the spool to the end positionby passing through a fully open position.This can lead to uncontrolled loadmovements.

Operation 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 position.

The 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. Theresulting spool position is thus proportional to the command signal.

Technical Data Direct Drive Valves

Direct Drive Valve Hydraulic Symbol

Valve pressure drop ∆p [bar]

Flow

rate

Q [l

/min

]

∆pm

ax=

350

bar (

5000

psi

)

Flow Signal Characteristic Curve

Contact MoogAmericas +1-716-652-2000Europe +49-7031-622-0Pacific +81-463-553615

Model Number

Type Code

Notes

Flow (gpm @1000 psitotal drop)

Flow (gpm @ 150 psitotal drop)

Max Supply Pressure(on main stage)

Null Cut

Fail-Safe

Seal Type

Elec Conn

Input Command

Power Supply

D633-303B

R02KO1M0NSM2

1

0.5

5000

Servo

0 to 1.5% overlap

Spool in

Mid-Position

Buna

7-Pin

+/-10VDC

+24VDC

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D633-317B

R04KO1M0NSM2

2

1

5000

Servo

0 to 1.5% overlap

Spool in

Mid-Position

Buna

7-Pin

+/-10VDC

+24VDC

D633-308B

R08KO1M0NSM2

5

2

5000

Servo

0 to 1.5% overlap

Spool in

Mid-Position

Buna

7-Pin

+/-10VDC

+24VDC

D633Z570B

R16KO1M0NSM2

Vibration resistantinternal connector

10

4

5000

Servo

0 to 1.5% overlap

Spool in

Mid-Position

Buna

7-Pin

+/-10VDC

+24VDC

D634Z395C

R24KO2M0NSM2

Vibration resistantinternal connector

16

6

5000

Servo

0 to 1.5% overlap

Spool in

Mid-Position

Buna

7-Pin

+/-10VDC

+24VDC

D634Z549A

R40KO2M0NSM2

Vibration resistantinternal connector

26

10

5000

Servo

0 to 1.5% overlap

Spool in

Mid-Position

Buna

7-Pin

+/-10VDC

+24VDC

D634-1019

P24KA6MOVSM2

16

6

5000

Proportional

0 to 3% overlap

Spool in

Mid-Position

Fluorocarbon

7-Pin

+/-10VDC

+24VDC

D634-1003

P40KA6MOVSM2

26

10

5000

Proportional

0 to 3% overlap

Spool in

Mid-Position

Fluorocarbon

7-Pin

+/-10VDC

+24VDC

D634Z1044

P60KA6MOVSM2

Vibration resistantinternal connector

42

16

5000

Proportional

0 to 3% overlap

Spool in

Mid-Position

Fluorocarbon

7-Pin

+/-10VDC

+24VDC