■ Proportional Electro-Hydraulic Directional and Flow Control Valves(with Main Valve Feedback Control)
OBE (on-board electronics) type proportional electro-hydraulic directional andflow control valve with a LVDT for spool position detection built into the mainvalve. High accuracy is achieved by configuring a closed loop.

■ Features● Simpler
Highly accurate hydraulic control can be obtained only by supplying 24 V DC power andinputting a command signal● High Accuracy
Hysteresis : 0.5 % or less
● SafetyThe valves support a fail-safe function to ensure safe operation in the event of electric failure(power failure, power cable disconnection, etc.).
● High Flow
Significantly increased flow rate compared to current products■ Graphic Symbols● Spool Type“3C2”,“3C21,“3C22”
A B

Sol a

A B

Sol b

Sol a

P T

Sol b

P T

Internal Pilot
Internal Drain Type

A B

Sol a

Y

Internal Pilot
External Drain Type

A B

Sol b

P T

Sol a

X

External Pilot
Internal Drain Type

Sol b

P TYX

External Pilot
External Drain Type● Spool Type“3C40”
A B

Sol a

A B

Sol b

P T

Internal Pilot
Internal Drain Type

H-80

Sol a

A B

Sol b

P TYInternal Pilot
External Drain Type

Sol a

A B

Sol b

P TX

External Pilot
Internal Drain TypeSol aSol bP TYXExternal Pilot
External Drain Type

Proportional Electro-Hydraulic Directional and Flow Control Valves(with Main Valve Feedback Control)

SERIES■ Specifications
Model Numbers

ECDFHG-04EH-150
3C21(P→B, B→T):120
3C22(P→A, A→T)

Rated Flow
[ΔP=1 MPa (4-Way Valve)]
ΔP = 0.5 MPa per Land
Max. Operating Pressure

MPa

Pilot Flow Rate★2L/min

ECDFHG-06EH-350

ECDFHG-06EH-500

3C21(P→B, B→T):230
3C22(P→A, A→T)L/min 3C2, 3C40
3C21(P→A, A→T) :150
3C22(P→B, B→T)

Pilot Pressure★1MPa

3C2, 3C40 : 200

3C2, 3C40 : 500

3C2, 3C40
3C21(P→A, A→T) :350
3C22(P→B, B→T)

35

31.5

2.5 - 35

2.5 - 31.5

5.5

7.5

External Drain T Port

MPa

31.525External Drain Y PortMPa

1 or less1 or lessInternal Drain T&Y Ports MPa

1 or less

Pilot Valve L/min

1.2 or lessInternal Leakage★4

Main Valve L/min

3C2, 3C21, 3C22 : 1.0 or less

3C2 : 1.4 or less

3C2, 3C21, 3C22 : 1.5 or less

3C40 : 2.0 or less

3C40 : 1.4 or less

3C40 : 2.8 or less

3C40 : 2.0 or less

3C40 : 4.0 or less

Step Response (0 → 100%)★5ms
Frequency Response±25% Amplitude★5384524Phase: -90°

Hz26

Gain: -3 dB

Hz

30

27

Hysteresis

0.5% or lessRepeatability

0.5% or lessPower Supply

21.6 - 26.4 V DC Included Ripple

Ambient Temperature

˚C-15 - +60

CurrentA
Power Input

VA

Coil Resistance at 20 ºCΩ

2 (Impulse Loud 3)75
4.6

Input Signal±10V, 4 - 20 mA, ±10 mA

Electric Connection

6 + PE Connector [EN 175201 Part 804]

Protection

Equivalent to IP64

Approx. Mass

kg1321★1. P
 ilot pressure should be between 2.5 MPa and 35 MPa (04EH), 2.5 MPa and 31.5 MPa (06EH), and should exceed 60% of the actual supply
pressure to main valve.
★2. Pilot flow is calculated with the above step response time at pilot pressure 3 MPa.
★3. Return pressure should be less than the actual supply pressure.
★4. This value is measured at a supply pressure of 14 MPa, pilot pressure of 14 MPa, and viscosity of 30 mm2 /s; it may vary depending on the actualcircuit/operation conditions.
★5. This value is measured for each valve based a pilot pressure of 14 MPa; it may vary depending on the actual circuit/operation conditions.

■ Details of the Valve Fail-Safe Functions
With reference to the information given below, select the option for the fail-safe function according to the use of applications.
A separate safety circuit should be provided if the hydraulic actuator must be reliably held or stopped.
No.

Model Numbers1ECDFHG-＊EH-＊-3C2-XY-＊＊-C
ECDFHG-＊EH-＊-3C21-XY-＊＊-C
ECDFHG-＊EH-＊-3C22-XY-＊＊-C

2

ECDFHG-＊EH-＊-3C40-XY-＊＊-C

Fail-Safe Function★
Spool Position
Neutral

EH Series-HybridComponents

Proof Pres.
at Return
Port★3

ECDFHG-04EH-200

Function
All Ports Blocked
A, B, T Connection★The fail-safe function’s activation time depends on the electric and hydraulic conditions.

Proportional Electro-Hydraulic Directional and Flow Control Valves(with Main Valve Feedback Control)H-81

■ Model Number Designation
ECDFHGSeries
Number- 04EH

- 150

Valve Amplifier
Size
Type

★1

ECDFHG:
Proportional
ElectroHydraulic
Directional
and FlowControl
Valves(with MainValve
FeedbackControl)- 3C2

Rated Flow L/min∆P= 1 MPa
(4-Way Valve)

Spool Type150：150 L/min

3C2
3C40
3C21
3C22

200：200 L/min

3C2
3C40

- XY
Directionof Flow

-E
Pilot
TypeT-C

Drain
Type

Fail-Safe
Function★2350：350 L/min

3C2
3C40
3C21
3C22

500：500 L/min

3C2
3C40

- 10

D: Voltage
Signal ± 10 V
(PABT Flowwith PositiveInput)

04

EH:OBEType-DInput Signal/
DesignSpool Travel
NumberMonitoring

XY:
Meter-in/Meter-out

None:
Internal
Pilot

None:
External
Drain

E:T:
External Internal
Pilot
Drain

C: Neutral06

E: Current
Signal 4 to20 mA(PABT Flowwith 12 to 20mA Input)

10

F: Current
Signal ± 10mA
(PABT Flowwith PositiveInput)★1. P
 hosphate ester type fluids are also supported. When phosphate ester type fluids are used, prefix “F-” to the model number because the special
seals (fluororubber) are required to be used.
★2. Refer to the previous page for details on the fail-safe function.

■ Electrical Specifications
Input Signal
Pin AA
BF
E

C

Current Signal “E“

Current Signal “F“

24 V DC (21.6 - 26.4 V DC Included Ripple), 75 VA or morePower Supply

Pin B

D

Voltage Signal “D”

0V

Pin CSignal Common

Pin D

Input (＋)(Differential)★1COM (0 V)

Pin E

Input (−)(Differential)★1Pin F

Spool Travel Monitoring

Pin

Protective Earth

0 - ±10 V
R i≧50 kΩ

4 - 20 mA
R i=200 Ω

0 - ±10 mA
R i=200 Ω

0 - ±10 V
RL≧10 kΩ4 - 20 mA
RL=100 - 500 Ω★20 - ±10 mARL=100 - 500 Ω★2—

★1. Differential input signals can be used only for the valves with the voltage signal specifications of ±10V.
(ECDFHG-＊EH-＊-D)★2. The recommended load resistance is 200 Ω.
● I/O Signal Characteristics

Output Signal(Spool Travel Monitoring)＋10 mA

20 mA ＋10 V

A B
P T

0 mA 12 mA 0 V

A B－10 mA 4 mA －10 V
－10 V
4 mA
－10 mA

P T0V
12 mA0 mA＋10 V

20 mA＋10 mA

DEF

Input Signal

H-82

Proportional Electro-Hydraulic Directional and Flow Control Valves(with Main Valve Feedback Control)

SERIES■ Block Diagram

PowerSupply

DC24V A
0V B

5A
LEDPower
Indicator(Green)

Input
SignalInput(＋) D
Input(－) E

Low Voltage
Detection Circuit

－V

Input
SignalDITHER Circuit
NULL

COM C

Internal
PowerSupply★The input stage for the current signal“E” and “F” is as follows.

＋V

Input(＋) D
Input(－) E

200Ω Ri

LED(Yellow)

SOL aMain Valve
Deviation Alarm★
Ri>50kΩ Ri

SOL b

SPAN

Spool Travel Monitoring F

L.V.D.T Amplifier

Protective Earth PE

Main Valve
L.V.D.T■ Accessories● Mounting BoltsValve Model Numbers
ECDFHG-04EH
ECDFHG-06EH

Mounting Bolt

Qty.

Tightening Torque Nm

Hex. Socket Head Cap Screw: M6 × 55L

212.9 - 15.9

Hex. Socket Head Cap Screw: M10×60L

460.6 - 74.1

Hex. Socket Head Cap Screw: M12×85L

6104 - 127■ Mounting Position
Mount the valve with the angle of the axis line L-L' within about ±15° fromthe horizontal plane as shown in the right figure. When the principal vibration
direction is consistent with the axial direction of the spool, the spool maymalfunction due to external force. Make sure that the principal vibration
direction is not consistent with the axial direction of the spool.

+15°
LL'

EH Series-HybridComponents-15°

Proportional Electro-Hydraulic Directional and Flow Control Valves(with Main Valve Feedback Control)

H-83

Mounting Surface: ISO 4401-07-07-0-05★1

ECDFHG-04EH
343
252.6
101.6

Tank Port “T”

Indicator Lamp

6.4 Dia. Through11 Spotface 2 Places

Pilot Pressure Port “X”(Used only for external pilot type)

Cylinder Port “B”

Pilot Drain Port “Y”(Used only for external drain type)

52.5
50

Cylinder Port “A”

10.510.5153591

Pressure Port “P”

69.9

10.5 Dia. Through17.5 Spotface 4 Places

34.1

70

58.4

Protective Screw for NULL Adjuster Hole★2
M5 (+) Thd.

227.6
6 + PE Electrical Plug
EN175201 Part 804★3

Manual Operation Pin

sol a

445

46

136

177（217）

241

sol b

Locating Pins
3 Dia. 2 Places.

Mounting Surface(O-Rings Furnished)

Indicator Lamp
Power Supply
Main Valve Deviation Alarm● O-Rings
Qty.
42★1. This valve can be mounted on ISO mounting surface.
However, in this case, the pressure loss becomes large and therated flow rate cannot be achieved.
★2. For NULL adjustment, remove the protective screw and turnthe trimmer behind the screw. After adjustment, be sure toattach the protective screw.
★3. The 6 + PE Electrical Plug is not included with the valve.
Prepare it separately.
YUKEN parts number: TK290457-1

H-84

M10 Thd. 17 Deep.
4 Places
1.6O-Ring
OR NBR-90 P22-N
OR NBR-90 P9-N

71.5
69.9
55.6
14.3

Port
P,A,B,T
X,Y

101.6
76.6
50
34.1
18.3
TPX

A

3.6 Dia. 5 Deep
2 Places

M6 Thd. 12 Deep.
2 Places6 Dia.
2 Places
15.9

ColorGreenYellow● Dimensions of Mounting Surface
Prepare the mounting surface as shown in the figure below.
The mounting surface should have a good machined finish 1.6 .

65.9
88.1
130

Proportional Electro-Hydraulic Directional and Flow Control Valves(with Main Valve Feedback Control)

B

57.2
91

● Indicator Lamp

Y20 Dia.
4 Places

SERIES
Mounting Surface: ISO 4401-08-08-0-05★1

ECDFHG-06EH
406
65

308.5
130.2

Pilot Drain Port “Y”(Used only for external drain type)

Indicator Lamp

52.5

13111570

Pressure Port “P”

46118

53.2

Tank Port “T”

92.1

13.5 Dia. Through20 Spotface 6 Places

Pilot Pressure Port “X”(Used only for external pilot type)77

Protective Screw for NULL Adjuster Hole★2
M5 (+) Thd.

Cylinder Port “B”

Cylinder Port “A”
283.5

6 + PE Electrical Plug
EN175201 Part 804★3
Manual Operation Pinsol a664

149200（230）264

sol bColor
Green
Yellow

Indicator Lamp
Power Supply
Main Valve Deviation Alarm● Dimensions of Mounting Surface
Prepare the mounting surface as shown in the figure below.
The mounting surface should have a good machined finish 1.6 .

● O-Rings
Qty.
42★1. This valve can be mounted on ISO mounting surface.
However, in this case, the pressure loss becomes large and therated flow rate cannot be achieved.
★2. For NULL adjustment, remove the protective screw and turn thetrimmer behind the screw. After adjustment, be sure to attach theprotective screw.
★3. The 6 + PE Electrical Plug is not included with the valve.
Prepare it separately.
YUKEN parts number: TK290457-1

M12 Thd. 24 Deep. 6 Places

7 Dia. 8 Deep
2 Places
11 Dia. 2 Places

PTY92.1
74.6

O-Ring
AS568-126 (NBR-90)
OR NBR-90 P14-N

130.2
112.7
94.5
77
53.2
29.4

XAB

19.1
17.5

PortP,A,B,T
X,Y

EH Series-HybridComponents● Indicator Lamp

Mounting Surface(O-Rings Furnished)

73.1
96.9

Locating Pins
6 Dia. 2 Places.

17.5
100.8
160

Proportional Electro-Hydraulic Directional and Flow Control Valves(with Main Valve Feedback Control)

32 Dia. 4 Places

H-85

■ No-Load Flow Characteristics〈Conditions〉●Valve Pressure Difference: 1 MPa (4-Way Valve/Pressure Difference per Land: 0.5 MPa）
●Viscosity: 30 mm2/s

ECDFHG-04EH-150-3C2/3C4015Input Signal %580
40-100 -80 -60 -40 -20 0-20-15 -10-5

Flow : P→A→B→T

100520 40 60 80 100

Input Signal %-80-120

Flow : P→B→A→T-10-15180
16012080

Flow : P→B-20 -150-160-180

Flow : B→T

Flow Rate
L/min

Flow : B→T

Around Null Position
Input Signal -20⇔+20%

40-20 -15

015

Input Signal %5L/minFlow : P→B-10-510

Flow : P→A

040 60 80 100

Input Signal %-160-180

Flow Rate
L/min-1205Flow : A→T

22020010-5Input Signal %-10-15

Flow : B→T

15 20

Flow : B→T-20

Around Null Position
Input Signal -20⇔+20%

ECDFHG-04EH-200-3C2/3C4080

Flow : P→A→B→T

Flow Rate
L/min

Flow Rate
L/min

-10

15 20-2080-80

16012080

60

Flow : P→A→B→T

40

Input Signal % 20

Input Signal %-20 -15-120-160-200-220

Flow Rate
L/min

20 40 60 80 100-40 Input Signal %-80

H-86

Input Signal %-15

Flow : P→A-40

Flow : P→B→A→T

10-52012040-100 -80 -60 -40 -20 00

Flow : A→T

180160Flow : A→T-55

ECDFHG-04EH-150-3C22-100 -80 -60 -40

5-10Flow Rate
L/min

Flow Rate
L/min-120

Input Signal %Input Signal %Flow : P→A

10

Input Signal %-80

Flow : P→B1540 60 80 100-40

Flow : A→T

Flow Rate
L/min

20

Flow : P→A

40

Input Signal %20

Around Null Position
Input Signal -20⇔+20%

Flow Rate
L/min

Flow Rate
L/min

ECDFHG-04EH-150-3C21-100 -80 -60 -40

15-20-160

Flow : P→B

10Input Signal %Flow Rate
L/min

Flow : P→B→A→T-5

Flow Rate
L/min-40

Flow Rate
L/min120-10-5051015 20-20 Input Signal %-40

Flow : P→B→A→T-60-80

Proportional Electro-Hydraulic Directional and Flow Control Valves(with Main Valve Feedback Control)

Flow Rate
L/min

Input Signal %20

Flow : P→A→B→T

Flow Rate
L/min

Flow Rate
L/min160

Around Null Position
Input Signal -20⇔+20%

SERIES

Around Null Position
Input Signal -20⇔+20%

ECDFHG-06EH-350-3C2/3C402530020Input Signal %50200

Input Signal % 100-100 -80 -60 -40 -20 0-20-15 -10-51020 40 60 80 100-5-100 Input Signal %-300-15

Flow : P→B→A→T-20

Flow Rate
L/min

Flow : P→B

200
100-20 -1540 60 80 100-300

Flow Rate
L/min-200-10-50-5

Flow : B→T-15

Flow : A→T-20

00-20 -15

40 60 80 100-100-200-300-400

Flow : P→B→A→T-10-50510-5 Input Signal %-10

Flow : A→T-15-20

Flow : B→T

Flow : B→T

Around Null Position
Input Signal -20⇔+20%100

Flow Rate
L/min300
200

20 40 60 80 100-100 Input Signal %-500-550

15 20-25400-400

Flow : P→A

10Input Signal % 5

Flow : P→A→B→T

Flow Rate
L/min

Flow Rate
L/min

550500-300

15Input Signal %ECDFHG-06EH-500-3C2/3C40-200

20

EH Series-Hybrid
Components

Flow Rate
L/min

Flow : P→B

100

Flow Rate
L/min

Flow Rate
L/min

Flow : P→A

200

Input Signal % 100-100 -80 -60 -40 -20 0

Flow : B→T

25300

Flow : A→T

15 20

Around Null Position
Input Signal -20⇔+20%

400

Input Signal %10-25-400-100 -80 -60 -40

5Input Signal %-10

ECDFHG-06EH-350-3C22
Flow : P→B

10Input Signal % 5Input Signal %-100

Flow : P→A

15Flow Rate
L/min020

Flow Rate
L/min

Flow Rate
L/min

Flow : P→A300

Flow : A→T

20

25400-100 -80 -60 -40

15Around Null Position
Input Signal -20⇔+20%

ECDFHG-06EH-350-3C21Input Signal %10Input Signal %-25-400

Flow : P→B

5-20

Input Signal %-15 -10-5

Flow : P→A→B→T

75
502505101520-25 Input Signal %-50

Flow : P→B→A→T-75

Flow RateL/min

Flow : P→B→A→T-10Flow Rate
L/min-200

Flow : P→A→B→T

15

Flow Rate
L/min

Flow : P→A→B→T

Flow Rate
L/min

Flow Rate
L/min400-100

Proportional Electro-Hydraulic Directional and Flow Control Valves(with Main Valve Feedback Control)H-87

■ Load Flow Characteristics〈Conditions〉●Viscosity: 30 mm2/s

ECDFHG-04EH-＊-3C2/3C40

ECDFHG-06EH-＊-3C2/3C40

1800

3000
2800

1600
1400

ECDFHG-04EH-200

Flow Rate L/min

Flow Rate L/min

ECDFHG-06EH-500

2400

1200
1000
800

2000
1600
1200600
800

400
ECDFHG-04EH-150200051015ECDFHG-06EH-350

40020253003551015202530 31.5

Load Press. Diff.｜P A － P B｜MPa

Load Press. Diff.｜P A － P B｜MPa■ Frequency Response〈Conditions〉●Hydraulic Circuit: Port A/B Closed ●Supply Pressure and Pilot Pressure: 14 MPa●Viscosity: 30 mm2/s●Amplitude: 50±25％This value is measured on a per valve basis; the actual frequency response may differ depending on the actual circuit.

ECDFHG-04EH

ECDFHG-06EHFrequency HzGain

Gain dB0H-88

Frequency Hz20 304050-3-51004551020 30 4050

10045

Gain
000-45-3-5-45-90-10

51Phase

-10

Phase

-90

Phase deg.

10Gain dB

5Phase deg.

51-15-135-15-135-20-180-20-180

Proportional Electro-Hydraulic Directional and Flow Control Valves(with Main Valve Feedback Control)