RE 18301-15/06.2018, Bosch Rexroth AG

4/3 and 4/2 Proportional directional valve elements

L8581… (EDC-P1)

RE 18301-15

Edition: 06.2018

Replaces: 07.12

4/3 and 4/2 Proportional directional valve elements

with ﬂ ow sharing control (LUDV concept)

PATENT PENDING

RE 18301-15

Edition: 06.2018

Replaces: 05.2017

General speciﬁ cations

Valve element with direct proportional ﬂ ow sharing

control.

It can achieve the simultaneous activation of different

actuators by distributing the available ﬂ ow

proportionally to the speeds selected by the operator.

All simultaneous movements go on at the same

reciprocal speed also in case of ﬂ ow shortage.

Each energized actuator receives a pressure

compensated ﬂ ow.

No shuttle valve ﬁ tted.

Wet pin proportional tubes for DC coils, with push rod

for mechanical override; nickel plated surface.

Manual override (push-button, screw type or lever)

available as option.

Different plug-in connectors available: see ordering

details.

Size 6

Series 00

Maximum operating pressure 310 bar (4500 psi)

Maximum ﬂ ow at 14 bar (203 psi) 59 l/min (15.59 gpm)

Maximum ﬂ ow at 18 bar (261 psi) 65 l/min (17.17 gpm)

Ports connections planned G 3/8 - G 1/2 - SAE8 and

Modular

Contents

Ordering details 2

Functional description 4

Technical data 5

Characteristic curves 6

External dimensions and ﬁ ttings 8

Electric connection 10

L8581… (EDC-P1)

Bosch Rexroth AG, RE 18301-15/06.2018

2 L8581… (EDC-P1) | 4/3 and 4/2 Proportional directional valve elements

Ordering details

01 02 03 04 05 06 07 08 09 10

L 8 5 81 0 _ _

Family

01 Directional Valve elements ED

Type

02 Size 6 proportional

Conﬁ guration

03 Flow Sharing

Coil type

04 GP45

Spool variants

05 4/3 operated both sides a and b; P, A, B, T closed in neutral

4/2 operated on side a only; P, A, B, T closed in neutral

4/2 operated on side b only; P, A, B, T closed in neutral

4/3 operated on both sides a and b; P closed; A and B

to T in neutral

4/2 operated on side a only; P closed; A and B to T in neutral

4/2 operated on side b only; P closed; A and B to T in neutral

Flow pattern & Nominal ﬂ ow

1) - 4)

Both meter in and out, A 4l/min(1.06gpm) -

B 4l/min(1.06gpm)

Both meter in and out, A 8l/min(1.85gpm) -

B 8l/min(1.85gpm)

Both meter in and out, A 12l/min(3.17gpm) -

B 12l/min(3.17gpm)

Both meter in and out, A 16l/min(4.23gpm) -

B 16l/min(4.23gpm)

Both meter in and out, A 25l/min(6.6gpm) -

B 25l/min(6.6gpm)

Both meter in and out, A 40l/min(10.57gpm) -

B 40l/min(10.57gpm)

Both meter in and out, A 50l/min(13.2gpm) -

B 50l/min(13.2gpm)

Only meter in, A 8l/min(1.85gpm) - B 8l/min(1.85gpm)

I 1

Only meter in, A 12l/min(3.17gpm) -

B 12l/min(3.17gpm)

I 2

Only meter in, A 25l/min(6.6gpm) - B 25l/min(6.6gpm)

I 4

Only meter in, A 40l/min(10.57gpm) -

B 40l/min(10.57gpm)

I 8

Only meter in, A 50l/min(13.2gpm) -

B 50l/min(13.2gpm)

I 9

Only meter in, A 59l/min(15.59gpm) -

B 59l/min(15.59gpm)

Both meter in and out, A 4l/min(1.06gpm) -

B 8l/min(1.85gpm)

Both meter in and out, A 8l/min(1.85gpm) -

B 12l/min(3.17gpm)

Both meter in and out, A 8l/min(1.85gpm) -

B 16l/min(4.23gpm)

Both meter in and out, A 12l/min(3.17gpm) -

B 16l/min(4.23gpm)

Both meter in and out, A 12l/min(3.17gpm) -

B 25l/min(6.6gpm)

Both meter in and out, A 16l/min(4.23gpm) -

B 25l/min(6.6gpm)

Both meter in and out, A 16l/min(4.23gpm) -

B 40l/min(10.57gpm)

Both meter in and out, A 25l/min(6.6gpm) -

B 40l/min(10.57gpm)

Both meter in and out, A 25l/min(6.6gpm) -

B 50l/min(13.2gpm)

Both meter in and out, A 40l/min(10.57gpm) -

B 50l/min(13.2gpm)

Voltage supply 07 03 01 00

07 Without coil

–––

●

12V DC

●●●

–OB

24V DC

●●●

–OC

Electric connections

08 Without coils

With coils, without mating connector DIN EN 175301-803

With coils, without mating connector vertical Amp-

Junior

With coils, without mating connector DT04-2P

Ports

09 G 3/8 DIN 3852

G 1/2 DIN 3852

3/4-16 UNF 2-B (SAE8)

Machined to interface modular elements

Options

10 Without manual override

Push-button type manual override

Screw type manual override

Twist type manual override (180°)

Red push-button type manual override

Black push-button type manual override

Lever type manual override

_ _

●

= Available

–

= Not available

1) The required hydraulic layout and spool variant can be chosen by

consulting page 3.

2) With ﬂ ow boost system. See external dimension on page 10-11.

3) Each different option for the type of emergency chosen implies a

speciﬁ c ordering code (refer to page 8).

4) With ∆p (P > A or P > B) 14 bar (203 psi).

5) See RE18301-45, RE18301-46, RE18301-47, for ﬂ angeable

elements.

6) For connectors ordering code see data sheet RE 18325-90.

Symbols

= 0

= 2

= 3

= M

RE 18301-15/06.2018, Bosch Rexroth AG

4/3 and 4/2 Proportional directional valve elements | L8581… (EDC-P1)

Ordering details

Spool variant and Flow pattern

=B2 =E2

=B2I =E2I

=B3 =E3

=B3I =E3I

=B4 =E4

=B4I =E4I

Both meter in and out

Only meter in

Bosch Rexroth AG, RE 18301-15/06.2018

4 L8581… (EDC-P1) | 4/3 and 4/2 Proportional directional valve elements

Functional description

234 77

The sandwich plate design directional valve elements

L8581… are compact direct operated pressure

compensated proportional solenoid valves which control

the start, the stop, the direction and the quantity of the oil

ﬂ ow, with a FLOW SHARING principle. These elements

basically consist of a stackable housing (1) with a control

spool, two solenoids (4), two return springs. Energized by

an electronic feed regulator, each solenoid (4) displaces

the control spool from its neutral-central position “0”

proportionally to the current received. When the spool is

shifted and the metering notch is open, ﬂ ow delivery starts

and is controlled by a 3 way pressure compensator

followed by a check valve for each port A and B. The

compensator, balanced by the LS pressure at the opposite

end, lifts up and unloads a regulated ﬂ ow which is sent to

the A (or B) port through the relevant check valve; at the

same time the opposite port allows oil return to tank.

LS pressure reaches the compensator “dead end” directly

from the A or B port, while the check valves lock eventual

pressure oscillations which could affect the compensator

function.

When the solenoid is de-energized, the return spring

pushes the spool thrust washer back against the housing

and the spool returns in its neutral-central position.

Each coil (4) is fastened to the solenoid tube by the ring

nut (7). A pin allows to push the spool under emergency

conditions, when the solenoid cannot be energized, like in

case of voltage shortage.

RE 18301-15/06.2018, Bosch Rexroth AG

4/3 and 4/2 Proportional directional valve elements | L8581… (EDC-P1)

Technical data

General

Valve element with 2 solenoids kg (lbs) 3.95 (8.71)

Valve element with 1 solenoid kg (lbs) 3.60 (7.91)

Ambient Temperature °C (°F) -30....+90 (-22....+194) (NBR seals)

MTTFd 150 years see RE 18350-51

Hydraulic

Maximum pressure at P, A and B ports bar (psi) 310 (4500)

Maximum pressure at T bar (psi) 210 (3050)

Maximum pressure with lever emergency at T bar (psi) 140 (2030)

Max. regulated ﬂ ow at 14 bar (203 psi) l/min (gpm) 59 (15.59)

Max. regulated ﬂ ow at 18 bar (261 psi) l/min (gpm) 65 (17.17)

E-schemes ﬂ ow pattern symmetrical closed pass in the

neutral position (connection from A to T and B to T)

Approx. 2% of the nominal cross-section

Hydraulic ﬂ uid

General properties: it must have physical lubricating

and chemical properties suitable for use in hydraulic

systems such as, for example:

Mineral oil based hydraulic ﬂ uids HL (DIN 51524 part 1).

Mineral oil based hydraulic ﬂ uids HLP (DIN 51524 part 2).

For use of environmentally acceptable ﬂ uids (vegetable or

polyglycol base) please consult us.

Fluid Temperature °C (°F) -30....+100 (-22....+212) (NBR seals)

Permissible degree of ﬂ uid contamination ISO 4572: β

≥75 X=12...15

ISO 4406: class 20/18/15

NAS 1638: class 9

Viscosity range mm

/s 20....380 (optimal 30....46)

Electrical

Voltage type PWM 120 Hz

Voltage tolerance (nominal voltage) % -10 .... +10

Duty Continuous, with ambient temperature ≤ 90°C (194°F)

Coil wire temperature not to be exceeded °C (°F) 180 (356)

Insulation class H

Compliance with Low Voltage Directive LVD 73/23/EC (2006/95/EC), 2004/108/EC

Coil weight kg (lbs) 0.335 (0.739)

Voltage V 12 24

Nominal 100% current A 1.8 1.2

Coil resistance

(nominal at 20°C (68°F))

- Cold value Ω 3.3 7.2

Note

For applications with different speciﬁ cations consult us

Code Voltage [V] Connector type Coil description Marking Coil Mat no.

=OB 01

12 DC EN 175301-803 (Ex. DIN 43650) GP45 01 - 45 K4 12 DC R901022180

=OB 03

12 DC AMP JUNIOR GP45 03 - 45 C4 12 DC R901022680

=OB 07

12 DC DEUTSCH DT 04-2P GP45 07 - 45 K40 12 DC R901272648

=OC 01

24 DC EN 175301-803 (Ex. DIN 43650) GP45 01 - 45 K4 24 DC R901022174

=OC 03

24 DC AMP JUNIOR GP45 03 - 45 C4 24 DC R901022683

=OC 07

24 DC DEUTSCH DT 04-2P GP45 07 - 45 K40 24 DC R901272647

Bosch Rexroth AG, RE 18301-15/06.2018

6 L8581… (EDC-P1) | 4/3 and 4/2 Proportional directional valve elements

Characteristic curves

Characteristic curves Q=Q (I)

0 20 40 60 80 100%A

0 20 40 60 80 100%A 0 20 40 60 80 100%A

0 20 40 60 80 100%A

l/min

gpm

1.6

1.5

1.2

0.9

0.6

0.3

gpm

7.9

gpm

15.85

gpm

20.6

gpm

6.3

gpm

4.7

gpm

15.8

Δp=261psi

Δp= 18bar

Δp=261psi

Δp= 18bar

Δp=261psi

Δp= 18bar

Δp=261psi

Δp= 18bar

Δp=261psi

Δp= 18bar

Δp=261psi

Δp= 18bar

Δp=261psi

Δp= 18bar

Δp=261psi

Δp= 18bar

Δp=203psi

Δp= 14bar

Δp=203psi

Δp= 14bar

Δp=203psi

Δp= 14bar

Δp=203psi

Δp= 14bar

Δp=203psi

Δp= 14bar

Δp=203psi

Δp= 14bar

Δp=203psi

Δp= 14bar

Δp=203psi

Δp= 14bar

0 20 40 60 80 100%A

l/min

gpm

3.2

2.5

2.0

1.5

1.0

0.5

Flow Q

Flow QFlow Q

Flow Q

% of maximum control current

% of maximum control current % of maximum control current

% of maximum control current

Nominal Flow = 1

Flow Q

% of maximum control current

Nominal Flow = 0

Nominal Flow = 4

Nominal Flow = 9 Nominal Flow = Z

Nominal Flow = 3

Nominal Flow = 2

Nominal Flow = 8

The curves refer to the spool fully open.

Measured with hydraulic ﬂ uid ISO-VG32 at 45° ±5 °C

(113° ±9 °F); ambient temperature 20 °C (68 °F).

RE 18301-15/06.2018, Bosch Rexroth AG

4/3 and 4/2 Proportional directional valve elements | L8581… (EDC-P1)

Characteristic curves

The curves refer to the spool fully open.

Measured with hydraulic ﬂ uid ISO-VG32 at 45° ±5 °C

(113° ±9 °F); ambient temperature 20 °C (68 °F).

0 10 20 30 40 50 60 l/min

0 10 15 20 25 30 bar

0 50 100 150 200 250 bar

0 10 20 30 40 50 60 l/min

bar

2.5

1.5

0.5

l/min

bar

psi

43.5

gpm

21,13

gpm

1,05

1,0

0,8

0,6

0,4

0,2

psi

435

400

350

300

250

200

150

100

P>A or P>B

B>T or A>T

0 2 4 6 8 10 12 14 15.8 gpm

0 200 400 600 800 870.2 psi

0 500 1500 2500 3625 psi

0 2 4 6 8 10 12 14 15.8 gpm

Pressure differential across the spool (ΔPls)

Pressure drop ∆p = ∆p(Q) (P

- P

OUT

) to the next section

Nominal ﬂ ow Qnom=Qnom (∆P ls) LS drain

Pressure Δp Flow Q

Flow Q

Pressure Δp

Pressure drop ∆p = ∆p(Q) with spool B2S9

5 section

4 section

3 section

2 section

1 section

Nominal ﬂ ow = Z

Nominal ﬂ ow = 9

Nominal ﬂ ow = 8

Nominal ﬂ ow = 4

Nominal ﬂ ow = 3

Nominal ﬂ ow = 2

Nominal ﬂ ow = 1

Nominal ﬂ ow = 0

Flow Q

Pressure Δp

Pressure p

Flow Q

Bosch Rexroth AG, RE 18301-15/06.2018

8 L8581… (EDC-P1) | 4/3 and 4/2 Proportional directional valve elements

External dimensions and ﬁ ttings

Dimensions [mm (inches)]

External dimensions and ﬁ ttings

()

()()

()

()()

()

1 Solenoid tube Ø 23 mm (0.91 inch).

2 Plug for 2 positions versions (4/2).

3 Ring nut for coil locking (Ø 30.3 mm).

Torque 6 – 7 Nm (4.4 – 5.2 ft-lb).

4 Flange speciﬁ cations for coupling to ED intermediate elements.

5 For tie rod and tightening torque information see data sheet RE

18301-90.

6 Clearance needed for connector removal.

7 A and B ports.

8 Identiﬁ cation label.

9 Optional push-button manual override, 0P type, for spool opening:

it is pressure stuck to the ring nut for coil locking.

Mat no. R933003424.

10 Optional screw type manual override, 0F type, for spool opening:

it is screwed (torque 6-7 Nm (4.4-5.2 ft-lb)) to the tube as

replacement of the coil ring nut. Mat no. R930056486.

11 Optional push-button manual override NP (black) and RP (red)

type, for spool opening. It is screwed (torque 6-7Nm(4.4-5.2 ft-

lb)) to the tube as replacement of the coil ring nut. Mat no.

R930056488(black) - R930056489 (red).

12 Optional twist type manual override, 0T type, for spool opening

and locking in the energised position. It is screwed (torque 6-7Nm

(44-5.2 ft-lb)) to the tube as replacement of the coil ring nut. Mat

no. R930056487

13 Four threaded holes M5 deepth 12mm (0.47 inch) for ﬁ tting a

secondary ﬂ angeable element. Bolts M5 with recommended

strength class DIN8.8: torque 5-6 Nm (3.6-4.4 ft-lb) (only for

version with modular secondary valves).

RE 18301-15/06.2018, Bosch Rexroth AG

4/3 and 4/2 Proportional directional valve elements | L8581… (EDC-P1)

External dimensions and ﬁ ttings

Dimensions [mm (inches)]

()

()()

()

1 Ordering Details: HA (if ﬁ tted to side A) or HB (if ﬁ tted to side B)

2 Ordering Details: VA (if ﬁ tted to side A) or VB (if ﬁ tted to side B)

3 Ordering Details: H1 (if ﬁ tted to side A) or H9 (if ﬁ tted to side B)

4 Ordering Details: V1 (if ﬁ tted to side A) or V9 (if ﬁ tted to side B)

5 Ordering Details: XA (if ﬁ tted to side A) or XB (if ﬁ tted to side B)

6 Ordering Details: X1 (if ﬁ tted to side A) or X9 (if ﬁ tted to side B)

Bosch Rexroth AG, RE 18301-15/06.2018

10 L8581… (EDC-P1) | 4/3 and 4/2 Proportional directional valve elements

External dimensions and ﬁ ttings

Dimensions [mm (inches)]

External dimensions for spool with nominal ﬂ ow 9 and Z

()

() ()

()

1 Flow-boost system only for spool with nominal ﬂ ow 9 and Z.

It always mounted on "b" side of the valve.

RE 18301-15/06.2018, Bosch Rexroth AG

4/3 and 4/2 Proportional directional valve elements | L8581… (EDC-P1)

External dimensions and ﬁ ttings

Dimensions [mm (inches)]

External dimensions for spool with nominal ﬂ ow 9 and Z

()

1 Flow-boost system only for spool with nominal ﬂ ow 9 and Z.

It always mounted on the opposite side of the lever manual

override.

Bosch Rexroth AG, RE 18301-15/06.2018

Bosch Rexroth Oil Control S.p.A.

Oleodinamica LC Division

Via Artigianale Sedrio, 12

42030 Vezzano sul Crostolo

Reggio Emilia - Italy

Tel. +39 0522 601 801

Fax +39 0522 606 226 / 601 802

compact-hydraulics-cdv@boschrexroth.com

www.boschrexroth.com/compacthydraulics

set forth in it, are the exclusive property of Bosch Rexroth Oil Control S.p.a..

It may not be reproduced or given to third parties without its consent.

The data speciﬁ ed above only serve to describe the product. No statements

concerning a certain condition or suitability for a certain application can be

derived from our information. The information given does not release the

user from the obligation of own judgment and veriﬁ cation. It must be

remembered that our products are subject to a natural process of wear and

aging.

Subject to change.

L8581… (EDC-P1) | 4/3 and 4/2 Proportional directional valve elements

Electric connection

Dimensions [mm (inches)]

Electric connection

Protection class: IP 65 when connector with seal is properly

screwed down.

Protection class: IP 65 with female connector

properly ﬁ tted (see drawing).

()

()()

()

Protection class: IP 69 K with female connector

properly ﬁ tted.

()

() ()

()