Atos spa

21018 Sesto Calende, Italy - Fax 0331 920005

Solenoid directional valves type DKI, DKU, DKOR

direct operated, ISO 4401 size 10

Table E020-11/E

DKI,DKU and DKOR are spool type,

three or four way, two or three position

direct operated solenoid valves desi-

gned to operate in oil hydraulic

systems.

They are operated by wet and pressure

sealed solenoid  with manual overri-

de:

• AI solenoid suitable for AC supply;

• AU solenoid for DC supply with

improved performance;

• AOR solenoid for DC supply with

high performance.

Moving parts are protected, lubricated

and cushioned in oil.

Shell-moulding casting  are 5 cham-

bers machined by transfer lines and

then cleaned by thermal deburring.

Optimized flow paths largely cored with

extrawide channels to tank for low

pressure drops.

Interchangeable spools  available in

a wide variety of configurations.

DKU and DKOR valves can be sup-

plied with optional devices for control

of switching times.

Standard electric/electronic connectors

 able to satisfy the requirements of

modern machines for electric interfa-

ces characteristics.

Coils are fully encapsulated (class H).

In DKI and DKU coils are easily repla-

ceable without the aid of tools.

Rugged execution suitable for outdoor

use.

Surface mounting ISO 4401 size 10.

Max flow up to 100 l/min for DKI/DKU

and up to 120 l/min for DKOR.

Max pressure: 315 bar.

DKI – 1

Directional control valves ISO 4401 size 10

DKI-1 = solenoid AI for AC supply

DKU-1 = solenoid AU for DC supply

DKOR-1= solenoid OO for DC supply

Valve configuration, see table 

61 = single solenoid, center plus external position,

spring centered

63 = single solenoid, 2 external positions, spring offset

67 = single solenoid, center plus external position,

spring offset

70 = double solenoid, 2 external positions, without

springs

71 = double solenoid, 3 positions, spring centered

75 = double solenoid, 2 external positions, with detent

77 = double solenoid, center plus external position,

without springs

Other configurations are available on request.

Spool type, see table



Design number

Synthetic fluids

WG =water glycol

PE= phosphate ester

/A **63 /*

1 MODEL CODE

E020

1/2

Options, see note 1 at section



X 24 DC

External supply voltage see section



00 = valve without coils (only for DKI and

DKU).

X = without connector

See note 2 at section



for available connectors,

to be ordered separately

BLEED SCREW

DKI

DKU

DKOR

SPOOLS - for intermediate passages, see tab. E001.

See note 3 at section



0/2

1/2

2/2

5/1

connector

Where the symbol doesn't show the hydraulic con-

nection (*), it depends on the central configuration of

the spool; see table



2 CONFIGURATION

-171*

-1630/2/A

-1631/2/A

-1700/2

-1701/2

-161*/A

-1750/2

-1751/2

-167*/A

-177*

-1630/2

-1631/2

-161* -167*

Assembly position / location

Commissioning

Subplate surface finishing Roughness index flatness ratio 0,01/100 (ISO 1101).

Ambient temperature from -20°C to +70°C.

Fluid Hydraulic oil as per DIN 51524 .... 535; for other fluids see section .

Recommended viscosity 15 ÷ 100 mm

/s at 40°C (ISO VG 15 ÷ 100).

Fluid contamination class ISO 19/16, achieved with in line filters at 25 µm value to β

≥ 75 (recommended).

Fluid temperature -20°C +60°C (standard and /WG seals) -20°C +80°C (/PE seals)

Flow direction As shown in the symbols of tables  and .

Operating pressure

Rated flow See diagrams Q/∆p at section .

Maximum flow 100 l/min for DKI and DKU; 120 l/min for DKOR, see operating limits at section .

For correct AC operation, the valve must be full of hydraulic fluid, otherwise some vibrations may

occur. In this case fill the valve with oil by opening the screw , see sketch at section and .

A check valve on T line aids to keep valve full.

MAIN CHARACTERISTICS OF DKI, DKU AND DKOR DIRECTIONAL VALVES

5 NOTES

1 Options

A = Solenoid mounted at side of port B (only for single solenoid valves). In standard versions, solenoid is mounted at side of port A.

WP = prolonged manual override protected by rubber cap (standard for DKOR models).

L, L1, L2, L3, LR, see sec. = device for switching time control (only for DKU and DKOR models).

Not available for valves with connectors E-SA or E-SE. For spools 4, 4/8, 5/1 only device L1 is available.

F * = with proximity switch for monitoring spool position: see tab. E110.

Y = external drain - not available for DKI-163* and DKI-175* (standard for versions with proximity switches /F*)

2 Type of electric/electronic connector with connector DIN 43650 to be ordered separately

SP-666 = standard connector IP-65 for direct connection to electric supply source.

SP-667 = as SP-666, but with built-in signal led.

SP-669 = with built-in rectifier bridge for supplying DC coils by alternate current (AC 110V and 230V - Imax 1A).

E-SA =

electronic connector (only for DKI and DKU valves) which improves performances and give faster shifting times for DC solenoid supplied by AC power.

E-SE = electronic connector (only for DKI and DKU valves) which improves performances and reduces power consumption for DC solenoid sup-

plied by DC power.

E-SR = electronic connector which permits switching of solenoid valves by a low power signal (max 20mA).

E-SD = electronic connector which eliminates electric disturbances when solenoid valves are de-energized.

Note: disturbance suppressor devices, similar to E-SD are, standard, built in all E-SA, E-SE, E-SR.

3 Spools

- spools type 0/2, 1/2, 2/2 are only used for two position valves: single solenoid valves, type DK*-163*/2; double solenoid valves type DK*-170*/2

and DK*-175*/2.

- spools type 0 and 3 are also available as 0/1 and 3/1 that, when in centre position, oil passage from ports to tank are restricted.

- spools type 1,4 and 5 are also available as 1/1, 4/8 and 5/1. They are properly shaped to reduce water-hammer shocks during the swiching.

Note that the configuration of spool 5/1 is inverted in respect with spool 5: see section .

- spools type 1,3 and 1/2 are also available as 1P, 3P and 1/2P to limit valve leackage.

- Other types of spools can be supplied on request.

10 11

Any position for all valves except for type - 170* (without springs) that must be installed with horizontal

axis if operated by impulses

(1) Coil can be supplied also with 60 Hz of volta-

ge frequency: in this case the performances

are reduced by 10÷15% and the power

consumption is 90 VA.

(2) Average values based on tests performed at

nominal hydraulic condition and ambient/coil

temperature of 20°C.

(3) In a cycle, where solenoid is energized/dee-

nergized in 1 second (1 Hz), the average

power consumption is 13 W; for longer cycles,

the power consumption is lower.

When solenoid is energized the inrush current

is 9 A at 12 V

DC and 6 A at 24 VDC correspon-

ding to power consumption peak of 130 W.

These current peaks persist for a period

shorter than 100 msec and they must be

considered when electric circuit is designed.

(4) When solenoid is energized the inrush cur-

rent is 7 A at 110 V

AC and 3,5 A at 230 VAC;

the power consumption peak is 800 VA;

these current peaks persist for a period shor-

ter than 40 msec and they must be conside-

red when electric circuit is designed.

(5) When solenoid is energized, the inrush cur-

rent is approx 3 times the holding current.

Inrush current values correspond to a power

consumption of about 350 VA.

6 DC

9 DC

12 DC

14 DC

18 DC

24 DC

28 DC

48 DC

110 DC

125 DC

220 DC

24/50 AC

24/60 AC

48/50 AC

48/60 AC

110/50 AC

120/60 AC

230/50 AC

230/60 AC

12 DC

24 DC

110/50 AC

120/60 AC

230/50 AC

230/60 AC

110/50 AC

120/60 AC

230/50 AC

230/60 AC

SP-666

SP-667

E-SE

E-SA

(4)

SP-669

52 W

110 VA

(5)

SP-CAI-24/50/60AC /80 (1)

SP-CAI-48/50/60AC /80 (1)

SP-CAI-110/50/60AC /80 (1)

SP-CAI-120/60AC /80

SP-CAI-230/50/60AC /80 (1)

SP-CAI-230/60AC /80

SP-CAU-6DC/ 80

SP-CAU-9DC /80

SP-CAU-12DC /80

SP-CAU-14DC /80

SP-CAU-18DC /80

SP-CAU-24DC /80

SP-CAU-28DC /80

SP-CAU-48DC /80

SP-CAU-110DC /80

SP-CAU-125DC /80

SP-CAU-220DC /80

SP-CAU-6DC /80

SP-CAU-12DC /80

SP-CAU-24DC /80

SP-CAU-48DC /80

SP-CAU-110RC /80

SP-CAU-230RC /80

brown

light blue

green

brown

blue

red

silver

gold

blue

black

yellow

white

light blue

silver

green

red

silver

gold

blue

13 W (3)

105 VA

95 VA

105 VA

95 VA

58 VA

53 VA

58 VA

53 VA

6 ELECTRIC FEATURES

Valve

External supply

nominal voltage

± 10%

Type of

connector

Power

consumption

(2)

Code of spare coil

DKI DKU

Colour of

coil label

DKI

DKU

12 DC

24 DC

110 DC

220 DC

SP-666

SP-667

40 W

46 W

DKO

Valve

External supply

nominal voltage

± 10%

Type of

connector

Power

consumption

(2)

110/50 AC

120/60 AC

230/50 AC

230/60 AC

SP-669

46 W

42 W

46 W

42 W

DKOR

Valve

External supply

nominal voltage

± 10%

Type of

connector

Power

consumption

(2)

Ports P,A,B: 315 bar;

Port T: 120 bar for DKI; 160 bar for DKU and 210 bar for DKOR; 315 bar for option Y.

For versions with proximity switches (/FI/NC and /FI/NO versions) port Y must be drained

4.1 Coils characteristics

Insulation class H (180°C) Due to the occuring surface temperatures of the solenoid coils, the European standards

EN563 and EN982 must be taken into account

Connector protection degree IP 65

Relative duty factor 100%

Supply voltage and frequency See electric feature 

Supply voltage tolerance ± 10%

E020

Q/∆P DIAGRAMS based on mineral oil ISO VG 46 at 50°C

M =Spools 0, 1, 1/2, 3.

Y = Spools 0/2, 4, 5, 6, 7.

V = Spools 2, 2/2, *9, 9*.

X = Spools 0, 0/2, 1, 1/2, 3, 6, 7, 8 with E-SA or E-SE

connector.

M = Spools 0, 1, 1/2, 8.

S = Spools 0/2, 3, 6, 7.

Y = Spools 2, 2/2, *9, 9* with E-SA or E-SE connectors.

V = Spools 2, 2/2, *9, 9*.

T = Spools 4, 5.

M = Spools 0, 0/2, 1, 1/2, 8.

S = Spools 3, 6, 7.

V = Spools 2, 2/2, *9, 9*

T = Spools 4, 5.

10 DEVICES FOR SWITCHING TIME CONTROL

These devices are only available for DKU and DKOR without E-SA or E-SE and can

check the switching time and therefore reduce the coil hammering in the circuit. The

different types available are shown in the figure.

The functionality of the device depends on the type of regulating element.

- L : checks and regulates the switching time in both moving directions of the spool:

regulation is carried out by screwing/unscrewing the element itself (regulating

choke);

- L1/L2/L3: checks the switching time in both moving directions of the spool with fixed

regulation of this time (gauged flow)

ØL1 = 1,25 mm; ØL2 = 1 mm; ØL3 = 0,75 mm;

- LR checks and regulates the switching time in the b→a direction of the spool move-

ment. The device does not intervene in the control of the switching time (standard

time) in the opposite direction a→b of the spool movement.

In all cases where it is necessary to obtain damped switching, pair these devices with

progressive spools (1/1, 4/8, 5/1) which in the intermediate passages are properly sha-

ped to reduce reversal shocks.

The passage in which the regulating element is inserted must be completely full of fluid

for it to function properly, see also “commissioning” at section



0, 2, 3 B B B B

0/2, 1, 8 B B A A

1/2, 2/2 C C B B

4, 5, 9* DDDDC

6 BBAB

7 BBBA

Flow direction

Spool type

P→AP→BA→TB→TP→T

SPOOL DIRECTION

a → b =

sol. energizing “a” / sol. de-energizing “b”

a ← b =

sol. energizing “b” / sol. de-energizing “a”

SWITCHING TIMES (average values in msec)

DKU + –– 60 30

DKU + SP-669 60 –– 90

DKU + E-SA 25 –– 45

DKU + –– 60 60

DKU + E-SE –– 40 40

DKU-*/L* –– 75-150 45-150

Valve Switch-on Switch-on Switch-off

AC DC

DKOR + SP-669 65 –– 95

DKOR-1**/L* –– 75-150 50-150

Valve Switch-on Switch-on Switch-off

AC DC

Test conditions:

- 50 l/min; 150 bar

- nominal voltage

- 2 bar of counter pressure on port T

- mineral oil ISO VG 46 at 50°C

The elasticity of the hydraulic circuit and the variations of the hydraulic characteristics and temperature affect the response time.

DKU DKOR

SP-666

SP-667

E-SD

E-SR

DKOR + –– 65 35

DKOR + –– 65 65

SP-666

SP-667

E-SD

E-SR

DKI - DKU

Valve pressure drop ∆p [bar]

Flow rate [l/min]

Valve pressure drop ∆p [bar]

Flow rate (l/min)

DKOR

Flow rate [l/min]

Inlet pressure [bar]

Flow rate [l/min]

Inlet pressure [bar]

Flow rate [l/min]

DKORDKUDKI

OPERATING LIMITS based on mineral oil ISO VG 46 at 50°C

The diagrams have been obtained with warm solenoids and power supply at lowest value (Vnom - 10%). The curves refer to application with symmetrical flow

through the valve (i.e. P→A and B→T). In case of asymmetric flow and if the valves have the devices for controlling the switching times the operating limits

must be reduced.

DKI + 35 60 30

Valve Switch-on Switch-on Switch-off

AC DC

DKI

SP-666

SP-667

Mounting surface

ISO 4401-AC-05-4 size 10

Fastening bolts: 4 socket head screws M6x40

Seals: 5 OR 2050.1 OR 108

Ports P,A,B,T: Ø = 11.5 mm (max)

Ports Y: Ø = 5 mm

INSTALLATION DIMENSIONS [mm]

09/04

13 MOUNTING SUBPLATES

Model Ports location

GAS Ports

A-B-P-T (X-Y)

Ø Counterbore

[mm]

A-B-P-T (X-Y)

Mass

[kg]

BA-308 (/Y)

BA-428 (/Y)

BA-434 (/Y)

Ports A, B, P, T (X, Y) underneath

Ports P, T, (X, Y) underneath; Ports A, B on lateral side

1/2" (1/4")

3/4" (1/4")

30 (21,5)

36,5 (21,5)

2,5

5,5

8,5

The subplates are supplied with 4 fastening bolts M6x40. Also available are multi-station subplates and modular subplates. For further details see table K280.

P = PRESSURE PORT

A, B = USE PORT

T = TANK PORT

Y = DRAIN PORT (only for option /Y)

For the max pressures on ports, see section



Mass: 3,8 kg Mass: 4,4 kg

DKI-16

DKU-16

DKI-17

DKU-17

Mass: 4,9 kg Mass: 6,1 kg

DKOR-16 DKOR-17

Overall dimensions refer to valves with connectors type SP-666

ELECTRIC/ELECTRONIC CONNECTORS ACCORDING TO DIN 43650 - The connectors must be ordered separately

SP-669

(for AC supply)

E-SA (for AC supply)

E-SE (for DC supply)

E-SR/AC (for AC supply)

E-SR/DC (for DC supply) E-SD/AC

(for AC supply)

SP-666, SP-667

(for AC or DC supply)

E-SD/DC

(for DC supply)

SP-666, SP-667

1 = Positive

2 = Negative

= Coil ground

SP-666 SP-667 E-SD-DC

AC or DC

All 24 All DC

voltages 110 voltages

220

E-SA E-SE E-SR-AC

110/50 AC

12 DC All

120/60 AC

24 DC voltages

230/50 AC

230/60 AC

110/50 AC

120/60 AC

230/50 AC

230/60 AC

12 DC

24 DC

All AC voltages

1,2 = Supply voltage VACPower supply V

DC:

RED = Positive

BLUE = Ground

Pilot signal V

DC:

YELLOW = Positive

+24VDC

WHITE = Negative

E-SA

1,2 = Supply voltage V

3 = Coil ground

E-SE

1 = Positive 2 = Negative

E-SR/AC

1,2 = Supply voltage V

3 = Coil ground

4 = Negative pilot signal VDC

5 = Positive pilot signal +24VDC

SP-669

1,2 = Supply voltage VAC

3 = Coil ground

Supplied with 5 m long cable.

YELLOW

WHITE

RED

BLUE

CONNECTOR WIRING

SUPPLY VOLTAGES