RE 64655, edition: 2015-01, Bosch Rexroth AG
▶ Size 6
▶ Component series 3X
▶ Maximum control pressure 30 bar
▶ Max. flow 40 l/min
Proportional pressure reducing valve,
direct operated, increasing characteristic curve
Features
▶ Direct operated proportional pressure reducing valve
for reducing the system pressure
▶ Pilot control valve
▶ Screw-in cartridge valve
▶ Suitable for mobile applications
▶ Operation by means of proportional solenoid
▶ In case of power failure, the minimum pressure is set
▶ Recommended control electronics:
Type RA and RC mobile amplifiers
RE 64655
Edition: 2015-01
Replaces: 07.12
H8039
Type MHDRE 06 SK (high-performance)
Contents
Features 1
Ordering codes 2
Valve types 2
Function, section, symbol 3
Technical data 4, 5
Admissible working range 5
Characteristic curves 6, 7
Dimensions 8
Mounting cavity 9
Individual components available 10
Further information 10
Contents
Features 1
Ordering codes
1) 2
Valve types 2
Function, section, symbol 3
Technical data
(For applications outside these parameters, please consult
us!) 4
Technical data
(Please consult us for applications outside these parame-
ters!) 5
Admissible working range 5
Characteristic curves
(measured with HLP46, ϑ
oil
= 40 ± 5 °C) 6
Characteristic curves with tolerance band
(measured with HLP46,
oil
= 40 ± 5 °C) 6
Characteristic curves with tolerance band
(measured with HLP46,
oil
= 40 ± 5 °C) 7
Dimensions
(dimensions in mm) 8
Mounting cavity R/MHDRE 06; 3 main ports
(dimensions in mm) 9
Individual components available 10
Further information 10
Notes 11
Notes 12
2/10 MHDRE 06 SK | Proportional pressure reducing valve
Bosch Rexroth AG, RE 64655, edition: 2015-01
Ordering codes
1)
01 Proportional pressure reducing valve, direct operated MHDRE
02 Size 6 06
03 Increasing characteristic curve S
04 Screw-in cartridge valve K
05 Component series 30 … 39 (30 … 39; unchanged installation and connection dimensions) 3X
06 Maximum control pressure 18 bar 18
Maximum control pressure 20 bar 20
Maximum control pressure 26 bar 26
Maximum control pressure 30 bar 30
07 Proportional solenoid, wet-pin A
Supply voltage
08 Control electronics 12 V DC G12
Control electronics 24 V DC G24
Electrical connection
1)
09 Without mating connector; connector according to DIN EN 175301-803 K4
Without mating connector; with connector DT 04-2P (Deutsch plug) K40
Without mating connector, with connector AMP Junior-Timer C4
Seal material
10 FKM seals V
Observe compatibility of seals with hydraulic fluid used! (Other seals upon request)
11 Further details in the plain text *
01 02 03 04 05 06 07 08 09 10 11
MHDRE 06 S K 3X / A V *
Valve types
1)
Mating connectors; separate order, see data sheet08006.
Type Material number
MHDRE 06 SK3X/18AG12K40V R901220628
MHDRE 06 SK3X/20AG12K40V R901150864
MHDRE 06 SK3X/26AG12K40V R901220722
MHDRE 06 SK3X/30AG12K40V R901220724
Type Material number
MHDRE 06 SK3X/18AG24K40V R901156353
MHDRE 06 SK3X/20AG24K40V R901220641
MHDRE 06 SK3X/26AG24K40V R901220719
MHDRE 06 SK3X/30AG24K40V R901220723
Proportional pressure reducing valve | MHDRE 06 SK 3/10
RE 64655, edition: 2015-01, Bosch Rexroth AG
Function, section, symbol
General
The type MHDRE 06 SK proportional pressure reducing
valve is a direct operated, 3-way version screw-in cartridge
valve. It reduces the control pressure (main port ①) pro-
portionally to the solenoid current and largely works inde-
pendently of the inlet pressure (main port ②).
When the command value = 0 or in the event of power
failure, the minimum pressure is set. Operation is effected
by means of proportional solenoid. The solenoid's interior
is connected to the main port ③ and filled with hydraulic
fluid.
Depending on the electric command value, these valves
can be used to continuously reduce the system pressure.
The valve is suitable for controlling couplings, pumps, and
directional valves, and is also suitable for use in propor-
tional pilot controls (especially in mobile applications).
Basic principle
The valve controls the pressure in the main port ① in
accordance with the current on the solenoid. The “S”
version signifies an increasing characteristic curve, i.e. an
increasing current brings about an increased pressure (see
characteristic curves on pages 6 and 7).
The proportional solenoid converts the electric current
into mechanical force that acts upon the piston via the
armature. The piston controls the connection between the
main ports.
Notes:
The tank pressure that occurs (main port
3
) is added
to the control pressure (main port
1
).
Version “C4” Version
“K40”
Version “K4”
(with mating connector)
① = main port 1 (A)
② = main port 2 (P)
③ = main port 3 (T)
4/10 MHDRE 06 SK | Proportional pressure reducing valve
Bosch Rexroth AG, RE 64655, edition: 2015-01
Technical data
(For applications outside these parameters, please consult us!)
General
Mass kg 0.7
Installation position any — if it is ensured that no air can collect upstream of the valve.
Otherwise, we recommend suspended installation of the valve.
Ambient temperature range °C See “Admissible working range” on page 5
Storage temperature range °C −40 … +80
Salt spray test according to EN ISO 9227 h 720 (NSS test)
Solenoid surface protection Coating according to DIN 50962-Fe//ZnNi with thick film passivation
Hydraulic
Maximum control pressure ▶ Main port ① bar 18; 20; 26; 30
Maximum inlet pressure ▶ Main port ② bar 100
Maximum counter pressure ▶ Main port ③ bar Depressurized (max. 100 bar; the tank pressures that occur are
added to the control pressure (main port ①))
Max. flow l/min See characteristic curves page 6
Maximum leakage ▶ Main port ③ ml/min 120 (50 bar in ②; I = 0 mA, 46 cSt)
Maximum pilot oil ml/min 120 (50 bar in ②; I = I
max
, 46 cSt)
Hydraulic fluid see table below
Hydraulic fluid temperature range °C −40 … +120
Viscosity range mm
2
/s 5 … 400
Maximum admissible degree of contamination of the
hydraulic fluid
Cleanless class according to ISO 4406 (c)
Class 20/18/15
1)
Hysteresis (within the tolerance band) bar ≤ 1.5 (control pressure 18, 20 bar)
≤ 2.0 (control pressure 26, 30 bar)
Step response (T
u
+ T
g
) 0 % → 100 %; 100 % → 0 % ms ≤ 60 (50 bar in ②; 46cSt, q
V
= 0 l/min, dead volume in ① 140 cm
3
)
Repetition accuracy % < 2 % of the maximum control pressure
Load cycles 10 million
Strainer element on the main port ② (P) µm 240
1)
The cleanliness classes specified for the components must be
adhered to in hydraulic systems. Effective filtration prevents faults
and at the same time increases the life cycle of the components.
For the selection of the filters see www.boschrexroth.com/filter.
We recommend using a filter with a minimum retention rate of
ß
10
≧ 75.
Hydraulic fluid Classification Suitable
sealing materials
Standards Data sheet
Mineral base oils HL, HLP NBR, FKM DIN 51524 90220
Bio-degradable ▶ insoluble in water HEES FKM ISO15380 90221
▶ soluble in water HEPG FKM ISO15380
Important information on hydraulic fluids:
▶ For more information and data about the use of other hydraulic
fluids, refer to data sheets above or contact us!
▶ There may be limitations regarding the technical valve data (tem-
perature, pressure range, life cycle, maintenance intervals, etc.).
▶ The flash point of the hydraulic fluid used must be 40 K higher
than the maximum solenoid surface temperature.
▶ Bio-degradable: When using bio-degradable hydraulic fluids that
are also zinc-solving, zinc may accumulate in the fluid (700mg zinc
per pole tube).
Proportional pressure reducing valve | MHDRE 06 SK 5/10
RE 64655, edition: 2015-01, Bosch Rexroth AG
When establishing the electrical connection, the protective
earthing conductor (PE
) has to be connected correctly.
Technical data
(Please consult us for applications outside these parameters!)
2)
Consultation is recommended for use at > 2000 m above sea level.
3)
Due to the surface temperatures of the solenoid coils, the
standards ISO13732-1 and ISO4413 need to be adhered to.
4)
The chopper frequency should be optimized for the application.
The working temperature range should be taken into consideration.
Electrical
Supply voltage V 12 DC 24 DC
Maximum control current A 1.45 0.7
Coil resistance at 20 °C Ω 5 22.5
Duty cycle (ED)
2)
% 100
Maximum coil temperature
3)
°C 185
Protection class according to
DIN EN 60529
▶ Version “K4” IP 65 with mating connector mounted and locked
▶ Version “C4” IP 66 with mating connector mounted and locked
IP 69K with Rexroth mating connector, material no. R901022127
▶ Version “K40” IP 69K with mating connector mounted and locked
Chopper frequency (recommended)
4)
Hz 150
Control electronics Analog amplifier type RA... (Data sheet 95230)
BODAS control unit type RC... (Data sheet 95200)
Design according to VDE 0580
Note:
▶ The technical data was determined at a viscosity of
v = 46 mm
2
/s (HLP46; ϑ
oil
= 40 °C)
▶ The following documentation must be observed: 64020-B1
Hydraulic valves for mobile applications
Admissible working range
Ambient temperature in °C →
Operating voltage in % of nominal voltage →
1 Required operating voltage in % of nominal voltage
2 Admissible continuous application of current in % of rated current
Admissible working range dependent on the ambient temperature
Admissible continuous application of current
in % of rated current →
6/10 MHDRE 06 SK | Proportional pressure reducing valve
Bosch Rexroth AG, RE 64655, edition: 2015-01
Characteristic curves with tolerance band
(measured with HLP46,
oil
= 40 ± 5 °C)
Characteristic curves
(measured with HLP46, ϑ
oil
= 40 ± 5 °C)
Flow in l/min →
Pressure difference in bar →
∆p-q
V
characteristic curves
1 ① → ③
2 ② → ①
Control current in A →
Set pressure at main port ①
in bar
→
Control pressure 18 bar
Proportional pressure reducing valve | MHDRE 06 SK 7/10
RE 64655, edition: 2015-01, Bosch Rexroth AG
Characteristic curves with tolerance band
(measured with HLP46,
oil
= 40 ± 5 °C)
Control current in A →
Control current in A →
Control current in A →
Set pressure at main port ①
in bar
→
Set pressure at main port ①
in bar
→
Set pressure at main port ①
in bar
→
Control pressure 20 bar
Control pressure 26 bar
Control pressure 30 bar
8/10 MHDRE 06 SK | Proportional pressure reducing valve
Bosch Rexroth AG, RE 64655, edition: 2015-01
Dimensions
(dimensions in mm)
1 Mating connector for connector “K4”
(separate order, see data sheet 08006)
2 Mating connector for connector “C4”
(separate order, see data sheet 08006)
3 Mating connector for connector “K40”
(separate order, see data sheet 08006)
4 Space required for removing the mating connector
5 SW28 hexagon; tightening torque M
A
= 10
+2
Nm
6 Solenoid nut, tightening torque M
A
= 5
+1
Nm
7 Strainer element
① = main port 1 (A)
② = main port 2 (P)
③ = main port 3 (T)
LS = Location Shoulder
Proportional pressure reducing valve | MHDRE 06 SK 9/10
RE 64655, edition: 2015-01, Bosch Rexroth AG
Mounting cavity R/MHDRE 06; 3 main ports
(dimensions in mm)
1)
Depth of fit
2)
Visual inspection
Standards:
Workpiece edges DIN ISO 13715
Form and position tolerance DIN EN ISO 1101
General tolerance for
metal-cutting procedures
DIN ISO 2768-mK
Tolerance DIN ISO 8015
Surface condition DIN EN ISO 1302
View “X”
① = main port 1 (A)
② = main port 2 (P)
③ = main port 3 (T)
LS = Location Shoulder
Bosch Rexroth AG, RE 64655, edition: 2015-01
10/10
MHDRE 06 SK | Proportional pressure reducing valve
Bosch Rexroth AG
Hydraulics
Zum Eisengiesser 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 18-0
documentation@boschrexroth.de
www.boschrexroth.de
© All rights reserved by Bosch Rexroth AG, as well as in the case of registration
of industrial property rights. It may not be reproduced or given to third parties
without the consent of Bosch Rexroth AG.
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. This information also does not release the user
from exercising his/her own judgment and conducting his/her own testing.
Our products are subject to a natural process of wear and aging.
Bosch Rexroth AG, RE 64655, edition: 2015-01
10/10 MHDRE 06 SK | Proportional pressure reducing valve
Bosch Rexroth AG
Hydraulics
Zum Eisengiesser 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 18-0
documentation@boschrexroth.de
www.boschrexroth.de
© All rights reserved by Bosch Rexroth AG, as well as in the case of registration
of industrial property rights. It may not be reproduced or given to third parties
without the consent of Bosch Rexroth AG.
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. This information also does not release the user
from exercising his/her own judgment and conducting his/her own testing.
Our products are subject to a natural process of wear and aging.
Individual components available
Further information
▶ Control electronics:
– Analog amplifier typeRA…
Data sheet 95230
– BODAS control unit typeRC…
Data sheet 95200
▶ Hydraulic valves for mobile applications Data sheet 64020-B1
▶ Mineral-oil-based hydraulic fluids Data sheet 90220
▶ Environmentally compatible hydraulic fluids Data sheet 90221
▶ Selection of the filters www.boschrexroth.com/filter
Item Denomination Material no.
998 Nut GZ45-01V BG R961004245
999 Seal kit of the valve R961003854
920 O-ring R900002507
999 920 998
Bosch Rexroth AG
Hydraulics
Zum Eisengiesser 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 18-0
documentation@boschrexroth.de
www.boschrexroth.de
© All rights reserved by Bosch Rexroth AG, as well as in the case of registration
of industrial property rights. It may not be reproduced or given to third parties
without the consent of Bosch Rexroth AG.
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. This information also does not release the user
from exercising his/her own judgment and conducting his/her own testing.
Our products are subject to a natural process of wear and aging.
Proportional pressure reducing valve | MHDRE 06 SK 11/10
RE 64655, edition: 2015-01, Bosch Rexroth AG
Bosch Rexroth AG
Hydraulics
Zum Eisengiesser 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 18-0
documentation@boschrexroth.de
www.boschrexroth.de
© All rights reserved by Bosch Rexroth AG, as well as in the case of registration
of industrial property rights. It may not be reproduced or given to third parties
without the consent of Bosch Rexroth AG.
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. This information also does not release the user
from exercising his/her own judgment and conducting his/her own testing.
Our products are subject to a natural process of wear and aging.
Proportional pressure reducing valve | MHDRE 06 SK 11/10
RE 64655, edition: 2015-01, Bosch Rexroth AG
Notes
Bosch Rexroth AG, RE 64655, edition: 2015-01
12/10
MHDRE 06 SK | Proportional pressure reducing valve
Bosch Rexroth AG, RE 64655, edition: 2015-01
12/10 MHDRE 06 SK | Proportional pressure reducing valve
Bosch Rexroth AG
Hydraulics
Zum Eisengiesser 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 18-0
documentation@boschrexroth.de
www.boschrexroth.de
© All rights reserved by Bosch Rexroth AG, as well as in the case of registration
of industrial property rights. It may not be reproduced or given to third parties
without the consent of Bosch Rexroth AG.
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. This information also does not release the user
from exercising his/her own judgment and conducting his/her own testing.
Our products are subject to a natural process of wear and aging.
Notes
