RE 18301-11/02.2016, Bosch Rexroth AG
4/3 and 4/2 on-off directional valve elements
L8511… (EDC-DZ)
RE 18301-11
Edition: 02.2016
Replaces: 07.12
4/3 and 4/2 on-off directional valve elements
with fl ow sharing control (LUDV concept)
RE 18301-11
Edition: 02.2016
Replaces: 07.2012
General specifi cations
Valve element with direct on-off fl ow sharing control.
It can achieve multiple simultaneous manoeuvres by
distributing the available fl ow to each actuator selected
by the operator, independently from the working
pressure required.
All simultaneous movements go on at the same reduced
speed in case of fl ow shortage.
Each energized actuator receives a pressure
compensated fl ow.
No shuttle valve fi tted.
Control spools directly operated by screwed-in
solenoids with extractable coils.
Wet pin tubes for DC coils, with push rod for mechanical
override; nickel plated surface.
Manual override (push-button, screw type or lever)
available upon request.
Different plug-in connectors available: see ordering
details.
Size 6
Series 00
Maximum operating pressure 310 bar (4500 psi)
Maximum ow at 14 bar (206psi) 48 l/min (12.7 gpm)
Maximum ow at 18 bar (261psi) 54 l/min (15.3 gpm)
Ports connections G 1/2 - SAE8 and Modular
Contents
Ordering details 2
Functional description 4
Technical data 5
Characteristic curves 7
External dimensions and fi ttings 8
Electric connection 10
L8511… (EDC-DZ)
Bosch Rexroth AG, RE 18301-11/02.2016
2 L8511… (EDC-DZ) | 4/3 and 4/2 on-off directional valve elements
Ordering details
Ordering details
01 02 03 04 05 06 07 08 09 10
L 8 5 11 0 _ _
Family
01 Directional Valve elements ED
L
Type
02 Size 6 proportional
8
Confi guration
03 Flow Sharing
5
Coil type
04 C45
11
Spool variants
1)
05 4/3 operated both sides a and b; P, A, B, T closed in neutral
B2
4/2 operated on side a only; P, A, B, T closed in neutral
B3
4/2 operated on side b only; P, A, B, T closed in neutral
B4
4/3 operated on both sides a and b; P closed; A and B
to T in neutral
E2
4/3 operated on side a only; P closed; A and B to T in neutral
E3
4/3 operated on side b only; P closed; A and B to T in neutral
E4
Flow pattern & Nominal fl ow
1) - 2)
06 Both meter in and out, A 35l/min(9.25gpm) -
B 35l/min(9.25gpm)
S8
Both meter in and out, A 48l/min(12.7gpm) -
B 48l/min(12.7gpm)
S9
Only meter in, A 35l/min(9.25gpm) -
B 35l/min(9.25gpm)
5)
I 8
Only meter in, A 48l/min(12.7gpm) -
B 48l/min(12.7gpm)
5)
I 9
Both meter in and out, A 15l/min(3.9gpm) -
B 35l/min(9.25gpm)
5)
38
Both meter in and out, A 24l/min(6.3gpm) -
B 35l/min(9.25gpm)
5)
48
Both meter in and out, A 24l/min(6.3gpm) -
B 48l/min(12.7gpm)
5)
49
Both meter in and out, A 35l/min(9.25gpm) -
B 48l/min(12.7gpm)
5)
89
Voltage supply 07 03 01 00
07 Without coil
–––
00
12V DC
●●●
–OB
13V DC
●●●
–AD
24V DC
●●●
–OC
27V DC
●●●
–AC
48V DC
––
–OD
110V DC
––
–OE
24V DC (21.5 DC)
––
–OV
110V DC (98 DC)
––
–OW
230V DC (207 DC)
––
–OZ
Electric connections
08 Without coils
00
With coils, without mating connector DIN EN 175301-803
01
6)
With coils, with bi-directional diode, without mating
connector vertical Amp-Junior
03
With coils, with bi-directional diode, without mating
connector DT04-2P
07
Ports
09 G 1/2 DIN 3852
2
3/4-16 UNF 2-B (SAE8)
3
Machined for interfacing to modular elements
M
4)
Options
10 Without manual override
00
Push-button type manual override
0P
Screw type manual override
0F
Lever type manual override
3)
_ _
= Available
= Not available
1) The required hydraulic layout and spool variant can be chosen by
consulting page 3.
2) With ∆P (P>A or P>B) 14 bar (203 psi).
3) Each different option for the type of emergency chosen implies a
specifi c ordering code (refer to page 9).
4) See RE18301-45, RE18301-46, RE18301-47, for fl angeable
elements.
5) Available only for E_spool variant.
6) For connectors ordering code see data sheet RE 18325-90.
Symbols
= 2
= 3
= M
RE 18301-11/02.2016, Bosch Rexroth AG
4/3 and 4/2 on-off directional valve elements | L8511… (EDC-DZ)
Ordering details
3
Spool variant and Flow pattern
Both meter in and out Only meter in
=B2 =E2 =E2I
=B3 =E3 =E3I
=B4 =E4 =E4I
Bosch Rexroth AG, RE 18301-11/02.2016
4 L8511… (EDC-DZ) | 4/3 and 4/2 on-off directional valve elements
Functional description
Functional description
4
6
23477
5
1
AB
The sandwich plate design directional valve elements
L8511… are compact direct operated pressure
compensated 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. When energized, each
solenoid (4) displaces the control spool from its neutral-
central position “0” and the metering notches are open;
ow is delivered to the 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 pressure compensated 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 a 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 18301-11/02.2016, Bosch Rexroth AG
4/3 and 4/2 on-off directional valve elements | L8511… (EDC-DZ)
Technical data
5
Technical data
General
Valve element with 2 solenoids kg (lbs) 3.82 (8.42)
Valve element with 1 solenoid kg (lbs) 3.00 (6.61)
Valve element with 2 solenoids and lever type emergency kg (lbs) 4.1 (9.00)
Valve element with 1 solenoid and lever type emergency kg (lbs) 3.25 (7.16)
Ambient Temperature °C (°F) –20....+50 (-4....+122) (NBR seals)
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)
Maximum fl ow l/min (gpm) 48 (12.7)
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) –20....+80 (-4....+176) (NBR seals)
Permissible degree of fl uid contamination ISO 4572: β
x
≥75 X=12...15
ISO 4406: class 20/18/15
NAS 1638: class 9
Viscosity range mm
2
/s 5....420
Electrical
Voltage type PWM DC (AC only with RAC connection)
Voltage tolerance (nominal voltage) % -10 .... +10
Duty Continuous, with ambient temperature ≤ 50°C (122°F)
Coil wire temperature not to be exceeded °C (°F) 150 (302)
Insulation class H
Compliance with Low Voltage Directive LVD 73/23/EC (2006/95/EC), 2004/108/EC
Coil weight with connection EN 175301-803 kg (lbs) 0.335 (0.74)
Voltage V 12 13 24 27 48 110
24
+
RAC
(21,5)
110
+
RAC
(98)
230
+
RAC
(207)
Voltage type DC DC DC DC DC DC AC AC AC
Power consumption W 33 31 33 33 33 35 33 33 35
Nominal 100% current A 2.8 2.30 1.40 1.20 0.7 0.32 1.60 0.34 0.16
Coil resistance (nominal at 20°C (68°F)) Ω 4.24 5.42 17 21.8 69.8 341.8 13.6 285 1229
Note
For applications with different specifi cations consult us
Bosch Rexroth AG, RE 18301-11/02.2016
6 L8511… (EDC-DZ) | 4/3 and 4/2 on-off directional valve elements
Technical data
Code Voltage [V] Connector type Coil description Marking Coil Mat no.
OB 01
12 DC
EN 175301-803
(Ex. DIN 43650)
C4501 12DC 12 DC R933000026
OB 03
12 DC AMP JUNIOR C4503 12DC 12 DC R933000027
OB 07
12 DC DEUTSCH DT 04-2P C4507 12DC 12 DC R933000030
AD 01
13 DC
EN 175301-803
(Ex. DIN 43650)
C4501 13DC 13 DC R933000028
AD 03
13 DC AMP JUNIOR C4503 13DC 13 DC R933000029
AD 07
13 DC DEUTSCH DT 04-2P C4507 13DC 13 DC R933000031
OC 01
24 DC
EN 175301-803
(Ex. DIN 43650)
C4501 24DC 24 DC R933000034
OC 03
24 DC AMP JUNIOR C4503 24DC 24 DC R933003630
OC 07
24 DC DEUTSCH DT 04-2P C4507 24DC 24 DC R933000032
AC 01
27 DC
EN 175301-803
(Ex. DIN 43650)
C4501 27DC 27 DC R933000035
AC 03
27 DC AMP JUNIOR C4503 27DC 27 DC R933000036
AC 07
27 DC DEUTSCH DT 04-2P C4507 27DC 27 DC R933000033
OD 01
48 DC
EN 175301-803
(Ex. DIN 43650)
C4501 48DC 48 DC R933000037
OE 01
110 DC
EN 175301-803
(Ex. DIN 43650)
C4501 110DC 110 DC R933000040
OV 01
24 RAC
EN 175301-803
(Ex. DIN 43650)
C4501 21.5DC 21.5 DC R933000038
OW 01
110 RAC
EN 175301-803
(Ex. DIN 43650)
C4501 98DC 98 DC R933000039
OZ 01
230 RAC
EN 175301-803
(Ex. DIN 43650)
C4501 207DC 207 DC R933000041