DIRECT DRIVE SERVOVALVE70 MPa OPERATING PRESSURE
J634 SERIESA DIRECT DRIVE SERVOVALVE（DDV）WITH ELECTRONIC CLOSED LOOPCONTROL OF SPOOL POSITION, WITH SPOOL POSITION CONTROL IN
BOTH DIRECTIONS, PERMITTING DIRECT CONTROL FROM A MACHINECONTROLLER WITHOUT ADDITIONAL INTERFACE ELECTRONICS

WHAT MOVES YOUR WORLDOutline

J634 SERIESThe series J634 is a direct drive servovalve（DDV）withelectronic closed loop control of spool position; suitable foroperating pressures up to 70 MPa. The spool is driven by apermanent magnet linear force motor which can actively
stroke the spool from its spring centred position in bothdirections. This is an advantage over proportional solenoids
which can only provide force in one direction and at much
lower force levels. This permits control of the valve directly
from, for example a machine control without the use ofadditional interface electronics.

TABLE OF CONTENTS
Outline2Features

3Specifications

4

Technical Data

5

External view of J634‐001X

6

External view of J634‐010X

7

J634‐010X

Note: The informAtion or details stated in this document is subject to change without notice. Please contact us for the latest informAtion.

2Features

J634 SERIESFEATURES•

Rated pressure 70 MPa•

Mounting pattern to DIN 24340 ／ Cetop 5•

High force level permanent magnet linear motor•

No pilot stage oil flow•

At loss of supply voltage, or broken cable, or emergency stop the valve returns to its
spring centred, safe null position without an excursion through a load move position.

•

Dynamic performance independent of supply pressure.

•IP65（DIN 40050）degree of protection.

•Low hysteresis and high resolution.

•Improved false polarity protection and over voltage protection.

•Electronic valve null adjust to compensate for load drift.

•Standardised spool position monitoring.

Null adjust cover plug
Valve connector

SpoolT
Integrated electronics

Cable holeBearing

APosition transducer

CoilP

Bushing

BY
Linear force motor

Permanent magnets

Centering springs

Armature

Plug

Centering spring3Specifications

J634 SERIESSPECIFICATIONS
Rated Flow

[L／min] 4 way,
P=7 MPa

2.5 L／min

5 L／min

7.5 L／min

20 L／min

Valve version

Single Stage, Direct Drive

Spool TypeBushing‐Spool Type＋／− 3 % overlap, Curvilinear flow curveInternal Leakage[L／min]@14 MPa

0.1 L／min

0.1 L／min

0.16 L／min

0.2 L／min＋／−10 V

Option 1＋／− 10 mA

Option 2＋4〜20 mA
70 MPaOperating Pressure
Range

0〜70 MPa

Y‐Port（External）

0〜5 MPa（F terminal）＋4〜20 mA
Flow out port A with D（＋）, E（−）

PolarityFrequency Response

See characteristic curves

Step Response

See characteristic curves

Null Shiftwith ΔT=55 ℃≦5.0 %

Threshold≦0.2 %

Hysteresis≦0.5 %

Seal Material
Operating Fluid
ViscosityStandard

NBR

Option（FKM）

Recommended

15〜45 mm2／s

Allowable

5〜400 mm2／s−20〜＋80 ℃

Temperature Range

β15=75Filter Rating

Any position, fixed or movablelnstallation Options
Degree of Protection

DIN40050

IP65
3.0 kg

Mass
Port O‐rings

0.8 L／min

DC24 V, 2.2 A

Standard

Rated Pressure

Spool position

0.4 L／min

DC24 V, 1.2 A

Power Supply

Rated Signal

40 L／minDIN 24340 ／ IS04401 Cetop5（but mounting bolt is M8）

Mounting pattern

410 L／min

P, A, B, T, Y port

6.5 kgMoog P／N A95513‐009（JIS B 2401 1‐B P9）

Mating Electrical
Connector

Moog P／N‐49054F014S006S（MS3106F‐14S‐6S）

Mounting Bolts

Moog P／N A04001‐008‐055（JIS B 1176 M8x55L,12.9T）

Technical Data

J634 SERIESTECHNICAL DATA

Frequency response J634‐013 at 7 MPa

10110100-10Gain ±10％-20

Gain ±25％

Phase ±10％-40

Phase ±100％110100Frequency response J634‐102 at 7 MPa

1010080-15060-10040-50

20

00-200-180

110100Gain ±10％-10-100

Phase ±10％-60

Phase ±100％-40-50-20
10.020

0.030

0.040

0.050
0.060
Time [sec]Step response J634‐102 at 70 MPa

1008060-80

Phase ±20％-401200.000 0.010-120

Gain ±100％-30-160-140

Gain ±25％-20-60

Step response J634‐013 at 70 MPa

Phase ±20％-500120-200

Gain ±100％-30-60-250

Stroke [%]0-300

Stroke [%]Typical Characteristic Curves

10100040

2000.000 0.010

0.020

0.030

0.040

0.050
0.060
Time [sec]Standard Models＋／− 10 V

Rated Signal

Rated Flow
[L／min]@ΔP=7 MPa

＋4〜20 mA

＋4〜20 mA

Output of Spool Position
2.5 L／min＋／− 10 mA

J634‐010

J634‐014

J634 ‐018

5 L／minJ634‐011

J634‐015

J634‐0197.5 L／min

J634‐012

J634‐016

J634‐020

10 L／minJ634‐013

J634‐017

J634‐021

20 L／minJ634‐101J634‐103J634‐105

40 L／minJ634‐102J634‐104

J634‐1065

External view of J634‐0137

J634 SERIES

Rated Flow 2.5 〜 10 L ／minElectricalConnector

（20）

60
43AFE
28A

4−14

FE

B

B
C

DName Plate

D30

4357

92

C

Ext. Drain

4−n930Filter243.2 Max.

60

85
12.5

B
YP

3.2
16.7
2737.3
50.8
54
97

59.5

Mounting Surface
85
12.5

54
50.8
37.3
2716.7

3.2
6.3

n314AY

B
T260

21.4

32.5

46P

T

5−n6.564−M8×15（60）

A

6.3

21.4

T21423

46

32.5

T

116.5 Max

Cover Screw
For Null Adjust

External view of J634‐0237

J634 SERIES

Rated Flow 20 〜 40 L ／minCover Screw
For Null Adjust

（20）

60

ElectricalConnector

A

F

43E
28A
F
E

B

B
C

4−14

DC

325362

105.3

Name Plate

126.4 Max

D4−n936Filter

Ext. Drain
260 Max

72

83

TA

2B

14Y
P

6,3

21.4

32.5

2346T

（72）

12.5

3,216,727
37.3
50.8
54
59.5

97

Mounting Surface
8512.55450.8
37.3
27
16.7

3.2

AY

B72

P

1421.4

32.5

466,3n3T2
T

5−n6.5

4−M8×157

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J634 Series-en_rev.A

YCO ／ YCO ／ PDF, July 2023

WHAT MOVES YOUR WORLD

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