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Information on available spare parts:
www.boschrexroth.com/spc
Proportional pressure reducing valve
of 3-way design
Type DRE 4 K
Size 4
Component series 3X
Maximum operating pressure 30 bar
Maximum flow 6 l/min
RE 29181/05.06
Replaces: 05.02
Table of contents
Contents Page
Features 1
Function 2
Ordering code 2
Standard types 2
Symbol 2
Technical data 3, 4
Control electronics 4
Electrical connection 5
Characteristic curves 5
Unit dimensions, mounting cavity and porting pattern 6
H1199-87
Features
– Direct operated proportional valve for reducing the pressure in
port A
– Cartridge valve
– Suitable for controlling directional valves (especially in mobile
applications)
– External control electronics
(separate order – see page 4)
• Analogue amplifiers
• Electronic signal encoders
• Power supply modules
Features 1
Function 2
Ordering code 2
Standard types 2
Symbol 2
Technical data (for applications outside these parameters, please
consult us!) 3
Technical data (for applications outside these parameters, please
consult us!) 4
Control electronics (separate order) 4
Electrical connection, plug-in connector (nominal dimensions in
mm) 5
Characteristic curves (measured with HLP46, ϑ
oil
= 40 °C ± 5
°C) 5
Unit dimensions, mounting cavity and porting pattern (nominal
dimensions in mm) 6
2/6 Bosch Rexroth AG Hydraulics
DRE 4 K RE 29181/05.06
Ordering code
Size 4 = 4
Cartridge valve = K
Component series 30 to 39 = 3X
(
30 to 39: unchanged installation and connection dimensions)
Max. pressure setting in port A 18 bar = 18
Max. pressure setting in port A 30 bar = 30
Voltage rating 24 VDC; max. control current 1.0 A = G24-10
Voltage rating 12 VDC; max. control current 2.2 A = G12-22
(on enquiry)
Further details in clear
text
Seal material
M = NBR seals,
suitable for mineral oil (HL, HLP)
to DIN 51524
Electrical connection
K4 = Without plug-in connector
Individual connection by means of coupler
plug to DIN EN 175301-803
Plug-in connector – separate order,
see page 5
N = With manual override
No code = Without manual override
DRE 4 K 3X K4 M
*
Standard types
Type Material number
DRE 4 K-3X/18G24-10K4M R900959368
DRE 4 K-3X/30G24-10K4M R900959369
DRE 4 K-3X/30G24-10NK4M R900959370
Symbol
Proportional pressure reducing valves of type DRE 4 K reduce
the pressure in port A proportionally to the solenoid current.
They are largely independent of the pressure in port P. These
valves are suitable for controlling directional valves, in particular
in mobile applications. The hydraulic pressure in port A acts via
a spool against the magnetic force. When the proportional sole-
noid is de-energised, a return spring at the spool opens the con-
nection from port A to port T.
The valves are provided for a nominal voltage of 24 VDC.
(12 VDC version on enquiry).
A programmable remote control type THE 6 is available for con-
trolling the valves (separate order, see page 4).
Further electronic signal encoders and electrical amplifier mod-
ules for controlling the valves are available (separate order, see
page 4).
Function
Hydraulics Bosch Rexroth AG
RE 29181/05.06 DRE 4 K
3/6
Hydraulic (measured with HLP46, ϑ
oil
= 40 °C ± 5 °C)
Max. set pres-
sure
Port A –
Pressure stage 18 bar
bar 18
–
Pressure stage 30 bar
bar 30
Max. permissible
inlet pressure
Port P bar 100
Counterpressure
Port T Pressureless (pressure in A is controlled) up to max. 100 bar
(spool opened from P to A)
Max. permissible flow l/min 6
Leakage flow Port T cm
3
/min < 50
Hydraulic fluid Mineral oil (HL, HLP) to DIN 51524;
other hydraulic fluids on enquiry
Hydraulic fluid temperature range °C – 20 to + 80
Viscosity range mm
2
/s 10 to 380
Max. permissible degree of contamination of the hy-
draulic fluid - cleanliness class to ISO 4406 (c)
Class 20/18/15
1)
Hysteresis % < 5
Repeatability % < ± 2 of 18 or 30 bar
Step response
Pressure stage 18 bar
with control block SM12
0 → 100 % ms < 150
100 → 0 % ms < 150
Pressure stage 30 bar 0 → 100 % ms < 200
100 → 0 % ms < 200
1)
The cleanliness classes specified for components must be
adhered to in hydraulic systems. Effective filtration prevents
malfunction and, at the same time, increases the service life
of components.
For the selection of filters, see data sheets RE 50070,
RE 50076, RE 50081, RE 50086 and RE 50088.
Technical data (for applications outside these parameters, please consult us!)
General
Sizes Size 4
Weight kg 0.6
Installation orientation Optional
Storage temperature range °C – 20 to +80
Ambient temperature range °C – 20 to +70
4/6 Bosch Rexroth AG Hydraulics
DRE 4 K RE 29181/05.06
When establishing the electrical connection, properly
connect the protective earth conductor (PE ).
Electrical
Type of voltage DC voltage
Voltage VDC 24 12
1)
Max. control current A 1.0 at 100 % command value 2.2 at 100 % command value
Coil resistance
– at 20 °C
Ω
12 2,4
– at 80 °C
Ω
18.24 3.65
Duty cycle % 100 100
Electrical connection Coupler plug to DIN EN 175301-803
Plug-in connector to DIN EN 175301-803
2)
Type of protection to EN 60529 (VDE 0470-1), DIN 40050-9 IP65 with plug-in connector mounted and locked
Technical data (for applications outside these parameters, please consult us!)
1)
on enquiry
2)
separate order – see page 5
Analogue amplifiers (amplifier modules) VT 11026 to RE 30226
VT 11031 to RE 29760
VT 11032 and VT 11165 to RE 29764
VT 11550 to VT 11552 to RE 29870
Electronic signal encoders VT 10468 to RE 29753
VT 10406 to RE 29754
VT 10399 to RE 29755
Power supply modules VT 11005 to RE 29732
VT 11006 to RE 29729
Control electronics (separate order)
PE
1 2
PE
1 2
Hydraulics Bosch Rexroth AG
RE 29181/05.06 DRE 4 K
5/6
Electrical connection, plug-in connector (nominal dimensions in mm)
Plug-in connector to DIN EN 175301-803
Separate order stating material no. R901017011
(plastic version)
Connection to plug-in connector
to amplifier
1
Fixing screw M3
Tightening torque M
T
= 0.5 Nm
Further details, see RE 08006!
Characteristic curves (measured with HLP46, ϑ
oil
= 40 °C ± 5 °C)
Set pressure in port A in bar →
Command value in % →
Pressure stage 18 bar
Set pressure in port A in bar →
Command value in % →
Pressure stage 30 bar
44 (30 bar)
64 (18 bar)
62 (30 bar)
71 (18 bar)
92,0 (30 bar)
87,5 (18 bar)
28
35
35
81
15
4
6
7
8
3
1.2
1.1
2
28
Ø14
Ø12
29,5
0,01/100mm
Rzmax 4
Bosch Rexroth AG
Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 18-0
Fax +49 (0) 93 52 / 18-23 58
documentation@boschrexroth.de
www.boschrexroth.de
© This document, as well as the data, specifications and other information
set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be
reproduced or given to third parties without its consent.
The data specified 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
verification. It must be remembered that our products are subject to a
natural process of wear and aging.
6/6 Bosch Rexroth AG Hydraulics
DRE 4 K RE 29181/05.06
1.1 Proportional solenoid without manual override
1.2 Proportional solenoid with manual override
2
Plug-in connector (separate order, see page 5)
3
Space required to remove plug-in connector
4 Valve fixing screws
(included in the scope of supply)
4
socket head cap screws ISO 4762 - M4x50 - 10.9-flZn240h-L
(friction coefficient 0.09 to 0.14 to VDA 235-101);
tightening torque M
T
= 2 Nm ± 10% (at 30 bar)
or
4
socket head cap screws ISO 4762 - M4x70 - 10.9-flZn240h-L
(friction coefficient 0.09 to 0.14 to VDA 235-101);
tightening torque M
T
= 2 Nm ± 10% (at 18 bar)
Unit dimensions, mounting cavity and porting pattern (nominal dimensions in mm)
5
Depth of fit
6
O-ring 25.12 x 1.78
7
8
O-ring 10.82 x 1.78
O-ring 9.25 x 1.78
Tolerances to: – General tolerances ISO 2768-mK
– Tolerating principle ISO 8015
Required surface quality of the
valve mounting face
Bosch Rexroth AG
Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 18-0
Fax +49 (0) 93 52 / 18-23 58
documentation@boschrexroth.de
www.boschrexroth.de
© This document, as well as the data, specifications and other information
set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be
reproduced or given to third parties without its consent.
The data specified 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
verification. It must be remembered that our products are subject to a
natural process of wear and aging.
Hydraulics Bosch Rexroth AG
RE 29181/05.06 DRE 4 K
7/6
Notes
Bosch Rexroth AG
Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 18-0
Fax +49 (0) 93 52 / 18-23 58
documentation@boschrexroth.de
www.boschrexroth.de
© This document, as well as the data, specifications and other information
set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be
reproduced or given to third parties without its consent.
The data specified 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
verification. It must be remembered that our products are subject to a
natural process of wear and aging.
8/6 Bosch Rexroth AG Hydraulics
DRE 4 K RE 29181/05.06
Notes
