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4WRKE...type
Electro-Hydraulic
Proportional Directional
Valve
4WRKE...3XTS type

Size 10, 16, 25, 32

Max. Working Pressure: 315 bar
Max. Flow: 1600 L/min

Contents Features
Function and configuration 02
Symbols 03
Ordering code 03
Technical data 04
Electrical connections 05
Characteristic curves 06-08
Unit dimensions 09-12

1
Function and configuration

Proportional directional valve type 4WRKE...3XTS...

4WRKE type valve is a 2-stage proportional directional control valves. They control the size and direction
of a flow. The main stage is closed loop position controlled so that the spool position is also independent of
flow forces at larger flows.
The valve consists of the pilot control valve(1), housing (8), main spool (7), covers (5 and 6), centering
spring (4), inductive position transducer (9) and the pressure reducing valve (3).
If no input signal is being applied then the main spool (7) is held in the centere position by the centering
spring (4). The two control chambers in the covers (5 and 6) are connected via the valve spool (2) to tank. The
main spool (7) is connected to suitable control electronics via the inductive position transducer(9). The
positional change of the main spool (7) as well as the alteration of the command value at the summation
point of the amplifier produces a differential voltage.
With the command actual value comparison a possible control deviation is recognised via the electronics
and an electrical current is applied to the proportional solenoid of the pilot valve (1).
The current induces, within the solenoid, a force which is passed on to the solenoid pin which in turn actuates
the control spool. The flow which is provided via the control cross sections causes the main spool to move.

Pilot control valve type 4WRAP 6 W7...-3XTS/G24...

The pilot control valve is a direct operated proportional valve. The control edge geometrics were designed and
optimised for the use as a pilot control valve for the proportional directional valves type 4WRKE.
The proportional solenoids are pressure tight, oil-immersed DC solenoids with removable coil. They
convert an electrical current proportionally into a mechanical force. An increase in the current strength
causes an appropriately higher solenoid force.
The valve consists of housing(1), proportional solenoids(2 and 3), spool(4) and springs(5 and 6).
In the de-energised condition both actuator ports are connected to tank. If one of the two solenoids (2 or 3) is
energised, then the solenoid force moves the valve spool (4) against the spring (6 or 5).
Once the overlap area is overcome, the connection to tank of one of the two actuator ports is blocked and the
connection to the pressure chamber is established. There is flow from P to the control chamber of the main stage.

1 2

“a” “b”
4
3

4
5

A P B
9 6 7 8 2 5 1 6 3
YT B P A TX

Type 4WRKE 16 ...–3XJ... Type 4WRAP 6 W7...-3XJ/G24...

A B A B
a o b a o b
a b a b
Y P T X Y P T
2
 A P B
9 6 7 2 5 1 6 3
1 Y 2T B P A T X

Symbols (simplified)
“a” “b”
4
3

Type 4WRKE...–3XTS...E. 4 Type 4WRKE...–3XTS...

5
A B A B
A P B
a o b 8 2 a5 1 a o b 6 3
9 a6 YT B P A TX 7 b b
Y P T X Y P T
Type 4WRKE ...–3XTS ... T . Type 4WRKE...-3XTS...ET

A B A B

a a o b a a o b
b b
X P T P T
A B A B

a Ordering code
a o b a o b
b a b
Y P T X Y P T

4WRKE -3XTS/ 6E G24 /

*
A B
Electrically operated A B Further information
A B
2-stage proportional o in plain text
a
a directional valve o
a b b a o b
a a o b
of
P b
T b V = FKM Seals
X design with
4-way P T =E P T No code = NBR Seals
integrated electronics E1-
D3 =With pressure reducing valve
Nominal size 10 =10 =E3 ZDR6DP0-L4X/40YM(fixed setting)
Nominal size 16 =16
=W6- Interface:
Nominal size 25 =25
W8-
Nominal size 32 =32 A B
C1= Command value input ±10mA
A1= Command value input ±10V
a o a o
F1= Command value input 4 to 20mA
Spool symbols =EA
A B
a o b a o b =W6A
P T
=E
E1- symbols
Transitional
=E3 Pilot oil supply and drain
=W6- No code =Pilot oil supply external,Pilot oil drain external
W8- E = Pilot oil supply internal,Pilot oil drain external
A B ET = Pilot oil supply internal,Pilot oil drain internal
a o a o T = Pilot oil supply external,Pilot oil drain internal
=EA
Supply voltage
G24= + 24 V DC
=W6A
6E= Proportional solenoid with removable coil
3XTS= 30TS to 39TS: unchanged installation and connection
Transitional symbols dimensions
Characteristic curve form
Nominal flow in L/min at 10 bar L= Linear
valve pressure differential P= Linear with fine control range
25= 50= 100= Nominal size 10
125= 200= Nominal size 16
220= 350= Nominal size 25
400= 600= Nominal size 32

3
Technical data
General
Nominal size 10 16 25 32
Installation and commissioning guidelines Optional, preferably horizontal
Storage temperature range ℃ – 20 to + 80
Ambient temperature range ℃ – 20 to + 50
kg 8.7 11.2 16.8 31.5

Hydraulic (measured at p=100bar,with HLP46 at ϑoil =40℃ ±5℃ )

Operating -Pilot control valve Pilot oil supply bar 25 to 315
pressure -Main valve Ports P, A, B bar Up to 315 Up to 350 Up to 350 Up to 350
Internal bar Static < 10
Return
External bar Up to 315 Up to 250 Up to 250 Up to 250
pressure
Port Y bar Static < 10
25 - - -
L/min 50 125 220 440
100 180 350 600
Flow of main valve (max. permissible) L/min 170 460 870 1600

L/min 4.1 8.5 11.7 13

Mineral oil(HL,HLP)to DIN 51 524

Pressure fluid
Phosphate ester (HFD-R)
Pressure fluid temperature range ℃ 10 to 80, preferably 40 to 50
Viscosity range mm2/s 20 to 380, preferably 30 to 45

A filter with a minimum retention

Degree of rate of βx = 75 is recommended
contamination
Pilot control valve Class 7 x=5
Main valve Class 9 x=7
Hysteresis % ≤1
% ≤ 0.5

Electrical
Voltage type DC
Electrical connection Plug-in connector to DIN EN175 201-804
W 72 (average = 24W)
Control electronics Integrated into the valve

4
Electrical connections, plug-in connector
73.5

For pin allocation also

see block circuit diagram.
A
B F
Plug-in connector to DIN

Φ28.5
C E
EN 175201-804 D

Φ6.5～Φ11
Component plug allocation
Contact Signal
A 24 VDC (18 to 35 VDC); Imax = 1, 5 A; impulse load ≤ 3 A
Supply voltage
B 0V
Ref. (actual value) C Ref. potential for actual value (contact F)
D ±10V or 4 – 20mA
Differential amplifierinput (command value)
E 0V ref. potentional
Measurement output (act. value) F ±10V or 4 – 20 mA
PE Connected with cooling body and valve housing
Command value:
Referance potential at E and a positive command value at D results in a flow from P to A and B to T.
Referance potential at E and a negative command value at D results in a flow from P to B and A to T.

Connection cable:
Recommendation: – Up to 25m cable length type LiYCY 7×0.75 mm 2
2

– Up to 50m cable length type LiYCY 7×1.0 mm External diameter: – 6.5 to

11mm (plastic plug-in connection)
– 8 to 12mm (metal plug-in connector) 06

Connect screen to ⊥ only on supply side.

Blockcircuit diagram / connection allocation of the integrated control electronics for type 4WRKE

7 pin Interface Integrated electronics (OBE) Valve

Current
Logic bias current controller
U Solenoid A
U Bias current A U
Command I
value +/- 10V Controller
Output stage A
D U
I
E
U
Current I
I
U controller Output stage B
Bias
4-20mA current B UI
Switch on Solenoid B
current limitation
Supply 24V A +/‒ UMW
+/‒ UM
voltage GND B MO
+/‒ Uref
=
Voltage ≈
monitoring monitoring Oscillator

Cable break
Ref. potential C recognition

U
U
F 4-20mA =
≈
Outputs I Position trans ducer
U Zero point main stage
+/‒ 10V

5
Characteristic curves (measured with HLP46, ϑoil =40℃ ±5℃ )

Flow - command value curve

Spool with characteristic curve L

100

80

60
Flow in % →

40

20
10

15 36.25 57.5 78.75 100

Command value in % →

Spool with characteristic curve P

100

80

60
Flow in % →

40

20
10

15 36.25 57.5 78.75 100

Command value in % →

NG 10 Transient function with a step form of electrical input signal

Signal change in %
100 0-100

0-75
Stroke in % →

75
0-50
50
0-25
25

0 10 20 30 0 10 20 30
Time in ms →
Flow-pressure differential curve
Flow load function at maximum valve openingtolerance(±10%)
170 1

100
100 50 1= Recommended
90
Flow in % →

flow limitation
50 25 (flow velocity 30 m/s)

25
20
10 20 50 100 200 300
Valve pressure differential in bar →

NG 16 Transient function with a step form of electrical input signal

Signal change in % 06
100 0-100
Stroke in % →

0-75
75
0-50
50
0-25
25
0 10 20 30 40 0 10 20 30 40
Time in ms →
Flow-pressure differential curve
Flow load function at maximum valve openingtolerance(±10%)
400 1

300
Flow in % →

200
200 125 1= Recommended
180 flow limitation
(flow velocity 30 m/s)
125
100
10 20 50 100 200
Valve pressure differential in bar →

NG 25 Transient function with a step form of electrical input signal

Signal change in %

100 0-100

0-75
Stroke in % →

75 0-50

50 0-25

25
0 10 20 30 40 50 60 0 10 20 30 40 50 60
Time in ms →

Flow-pressure differential curve

Flow load function at maximum valve openingtolerance(±10%)
1
1000
870

1= Recommended
Flow in % →

350

500 flow limitation

220 (flow velocity 30 m/s)
350

220
200
10 20 30 40 50 100 200
Valve pressure differential in bar →

NG 32 Transient function with a step form of electrical input signal

Signal change in %
100 0-100

0-75
Stroke in % →

75
0-50

50 0-25

25
0 20 40 60 80 100 120 140 0 20 40 60 80 100 120 140
Time in ms →

Flow-pressure differential curve

Flow load function at maximum valve openingtolerance(±10%)
1600 1

1000
Flow in % →

600 1= Recommended
flow limitation
400
6 (flow velocity 30 m/s)

0
10 20 50 100 200 300 350
500
Valve pressure differential in bar →
400

8
Unit dimensions (Dimensions in mm)

NG 10
3 1 2 5 4 6

15

194
7
8

86
70
35 25.5
12 11 9 10
52.5 105
322

0.01/100mm
Machined valve
0.8 mounting surface
7.9 61.9
11.1

6.3
Required surface finish of
P
06
mating piece X Y
A B

21.4
32.5
TB

46
TA
M6/12

3.2
1 Pilot control valve
16.7
2 Plug-in connector "A" 27
3 Plug-in connector "B" 37.3
4 Space required to remove 50.8
54
the plug-in connector
5 Cable
6 Plug-in connector
7 Pressure reducing valve
8 Name plate
9 Main valve
10 Integrated control electronics
11 R-ring 13×1.6×2, ports A, B, P, T
12 R-ring 11.18×1.6 ×1.78, ports X and Y

9
Unit dimensions (Dimensions in mm)

NG 16
3 1 2 4 5 6

15
7
8

204
96
43
36 27 Φ3
12 14 11 9 10
94
154
353

Machined valve mounting surface

T P
0.01/100mm
X
0.8

69.9
71.5
55.6
A
54

B Y
35

Required surface finish of

mating piece
18.3
12.7
14.3
1.6

34.1 4×M10
50
65.9
76.6
1 Pilot control valve 88.1
2 Plug-in connector "A" 101.6 2×M6
3 Plug-in connector "B"
4 Space required to remove
the plug-in connector
5 Cable
6 Plug-in connector
7 Pressure reducing valve
8 Name plate
9 Main valve
10 Integrated control electronics
11 R-ring 22.53×2.3×2.62, ports A, B, P, T
12 R-ring 10×2×2, ports X and Y
14 Locating pin

10
Unit dimensions (Dimensions in mm)

NG 25

3 1 2 4 5 6

15

234
7
8

126
41
4
Φ6
19 12 14 11 9 10 117
191
（56） 348
404

Machined valve
21 76.8 mounting surface
0.01/100mm
0.8
T
06
P Y

96.8
92
X A B
74.5
Required surface finish of
17.5
73
mating piece
46
19

17.3
29.2 6×M12
53
1 Pilot control valve 77
2 Plug-in connector "A" 94.3
3 Plug-in connector "B" 100.6
4 Space required to remove 112.5
130
the plug-in connector
5 Cable
6 Plug-in connector
7 Pressure reducing valve
8 Name plate
9 Main valve
10 Integrated control electronics
11 R-ring 27.8×2.6×3, ports A, B, P, T
12 R-ring 19×3×3, ports X and Y
13 Locating pin

11
Unit dimensions (Dimensions in mm)

NG 32
3 1 2 4 5 6

15
7

260
49152
4
Φ6
21.5 197
12 14 11 9 10
254
(80.5) 424.5
505

Machined valve 6×M20

mounting surface

0.01/100mm
T P Y
0.8

159
X A B

114.5
06

124
Required surface finish 79.3
28.5

of mating piece
35

41.5
76
82.5
114.5
1 Pilot control valve 147.5
2 Plug-in connector "A" 168.5
190.5
3 Plug-in connector "B"
4 Space required to remove
the plug-in connector
5 Cable
6 Plug-in connector
7 Pressure reducing valve
8 Name plate
9 Main valve
10 Integrated control electronics
11 R-ring 42.5×3×3,ports A, B, P, T
12 R-ring 19×3×3, ports X and Y
13 Locating pin

12