RE 29175, edition: 2013-06, Bosch Rexroth AG
Proportional pressure reducing valve,
pilot operated
Contents
Features 1
Ordering code 2, 3
Symbols 3
Function, section 4, 5
Technical data 6, 7
Electrical connection 8, 9
Characteristic curves 9 ... 13
Dimensions 14 ... 18
Accessories 18
▶ Size 6
▶ Component series 1X
▶ Maximum operating pressure: 210 bar (DRE)
315 bar (ZDRE)
▶ Maximum flow: 30 l/min
Type DRE(E) and ZDRE(E)
RE 29175 
Edition: 2013-06
Replaces: 01.12
Features
▶ Pilot operated pressure reducing valve in ports A and
P1 with pressure limitation
▶ Operation by means of proportional solenoids
▶ For subplate mounting or sandwich plate design:
Porting pattern according to ISO 4401-03-02-0-05
▶ Low manufacturing tolerance of the command value
pressure characteristic curve due to electrical adjustment
for the operation with external control electronics
▶ Minimum set pressure in ports A or P1, see page 12
▶ Types DREE and ZDREE with integrated electronics (OBE)
▶ CE conformity according to EMC Directive 2004/108/EC
Inhalt
Features 1
Contents 1
Ordering code 2
Ordering code 3
Symbols (① = component side, ② = plate side) 3
Function, section 4
Function, section 5
Technical data
(for applications outside these parameters, please consult
us!) 6
Technical data
(for applications outside these parameters, please consult
us!) 7
Electrical connection (dimensions in mm) 8
Electrical connection 9
Characteristic curves (measured with HLP46,
oil
= 40 °C
±5 °C) 9
Characteristic curves: Type (Z)DRE (measured with HLP46,
oil
= 40 °C ±5 °C) 10
Characteristic curves: Type (Z)DREE (measured with
HLP46,
oil
= 40 °C ±5 °C) 11
Characteristic curves (measured with HLP46,
oil
= 40 °C
±5 °C) 12
Characteristic curves (measured with HLP46,
oil
= 40 °C
±5 °C) 13
Dimensions: Type DRE
(dimensions in mm) 14
Dimensions: Type DREE
(dimensions in mm) 15
Dimensions: Type ZDRE
(dimensions in mm) 16
Dimensions: Type ZDREE
(dimensions in mm) 17
Dimensions 18
Accessories (not included in the scope of delivery) 18
2/18 DRE(E); ZDRE(E) | Proportional pressure reducing valve, pilot operated
Bosch Rexroth AG, RE 29175, edition: 2013-06
Ordering code
01 Subplate mounting no code
Sandwich plate Z
02 Proportional pressure reducing valve DRE
03 For external control electronics no code
With integrated electronics (OBE) E
04 Size 6 6
05 Pressure reduction in channel A (subplate mounting) no code
Pressure reduction in channel P1 (sandwich plate) VP
Position of the mating connector (omitted in case of subplate mounting)
06
1
2
3
4
07 Component series 10 … 19 (10 … 19: Unchanged installation and connection dimensions) 1X
Pressure rating
08 50 bar 50
100 bar 100
210 bar 210
315 bar 315
1)
09 Without check valve M
Supply voltage
10 Direct voltage 24 V G24
11 With manual override N9
Without manual override no code
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
DRE 6 ― 1X / M G24 *
Valve contact surface
(seal ring recesses in the housing)
Valve contact surface
(seal ring recesses in the housing)
Valve contact surface
(seal ring recesses in the housing)
Valve contact surface
(seal ring recesses in the housing)
1)
Only available for "Z" version
Proportional pressure reducing valve, pilot operated | DRE(E); ZDRE(E) 3/18
RE 29175, edition: 2013-06, Bosch Rexroth AG
Type DRE 6… Type ZDRE 6 VP…
Ordering code
Electrical connection
12 Type DRE; ZDRE:
Without mating connector; connector DIN EN 175301-803
Mating connector, separate order, see page 18
K4
Type DREE; ZDREE:
Without mating connector; connector M12
Cable set, separate order, see page 18
K24
Interface electronics
13 Command value 0 to 10 V A1
Command value 4 to 20 mA F1
Type (Z)DRE no code
Seal material
14 NBR seals M
FKM seals V
09 Further details in the plain text
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
DRE 6 ― 1X / M G24 *
Symbols (① = component side, ② = plate side)
Type DREE 6… Type ZDREE 6 VP…
4/18 DRE(E); ZDRE(E) | Proportional pressure reducing valve, pilot operated
Bosch Rexroth AG, RE 29175, edition: 2013-06
The valve types DRE and ZDRE are electrically pilot operated
3-way pressure reducing valves with pressure limitation of
the actuator.
They are used for reducing a system pressure.
Technical set-up:
The valve consists of three main assemblies:
▶ Pilot control valve (1)
▶ Proportional solenoid (2)
▶ Main valve (3) with main control spool (4)
Function:
Type DRE
General function:
▶ Command value-dependent setting of the pressure to be
reduced in channel A via the proportional solenoid (2).
▶ In the depressurized port P, the spring (17) holds the
main control spool (4) in the initial position.
▶ Thus, opening the connection from A to T and blocking
of the connection from P to A.
▶ Pressure connection from port P to the ring channel (5).
▶ Pilot oil flows from the bore (6) to port T, via the flow
controller (7), the nozzle (8) to the pilot control
valve(1), the throttle gap (9) to the longitudinal
groove(10) and the bores (11, 12).
Pressure reduction:
▶ Build-up of the pilot pressure in the control cham-
ber(16) as function of the command value.
▶ Movement of the main control spool (4) to the right,
hydraulic fluid flows from P to A.
▶ Actuator pressure pending in port A to the spring cham-
ber (15) via channel (13) and nozzle (14).
▶ Increase in the pressure in port A to the set pressure of
the pilot control valve (1) leads to the movement of the
main control spool (4) to the left. The pressure in
portA is almost equal to the pressure set at the pilot
control valve (1).
Pressure limitation:
▶ If the pressure in port A exceeds the set pressure of the
pilot control valve (1), the main control spool (4) is
moved further to the left.
▶ Thus, opening of the connection from A to T and limita-
tion of the pressure pending in port A to the set com-
mand value.
Type ZDRE
In principle, the function of this valve corresponds to the
function of type DRE 6.
The pressure is, however, reduced in channel P1.
Function, section
Type DRE 6-1X/...K4...


 



  
Proportional pressure reducing valve, pilot operated | DRE(E); ZDRE(E) 5/18
RE 29175, edition: 2013-06, Bosch Rexroth AG
Type (Z)DREE – with integrated electronics (OBE)
With regard to function and structure, these valves corre-
spond to type (Z)DRE. On the proportional solenoid (2),
there is moreover a housing (18) with the control electronics.
Supply and command value voltage or command value
current are applied to the connector (19).
In the factory, the command value pressure characteristic
curve is adjusted with little manufacturing tolerance.
Function, section

  
 



Type ZDREE 6 VP1-1X/...K24...
(① = component side, ② = plate side)
6/18 DRE(E); ZDRE(E) | Proportional pressure reducing valve, pilot operated
Bosch Rexroth AG, RE 29175, edition: 2013-06
Technical data
(for applications outside these parameters, please consult us!)
hydraulic (measured with HLP46, ϑ
oil
= 40 ±5 °C)
Maximum operating pressure – Port P or P2 bar 315
– Port P1, A, and B bar 210
– Port T bar Separately and to the tank at zero pressure
Maximum set pressure in
channelsP1 and A
– Pressure rating 50 bar bar 50
– Pressure rating 100 bar bar 100
– Pressure rating 210 bar bar 210
– Pressure rating 315 bar bar 315
1)
Minimum set pressure with command value 0 in channels P1 and A
bar See characteristic curves page 12
Pilot flow l/min 0.65
Maximum flow l/min 30
Hydraulic fluid See table page 7
Hydraulic fluid temperature range °C –20 … +80
Viscosity range mm
2
/s 15 ... 380
Maximum admissible degree of contamination of the hydraulic fluid
cleanliness class according to ISO 4406 (c)
Class 20/18/15
2)
Hysteresis % ±2.5 of the maximum set pressure
Repetition accuracy % < ±2 of the maximum set pressure
Linearity – Type (Z)DRE 6 % ±3.5 of the maximum set pressure
Manufacturing tolerance of the com-
mand value pressure characteristic
curve, related to the hysteresis char-
acteristic curve, pressure increasing
– Type (Z)DRE 6 % ±2 of the maximum set pressure
– Type (Z)DREE 6 % ±3 of the maximum set pressure
Step response T
u
+ T
g
10% → 90%
ms ~150 Measured with 1 liter standing
hydraulic fluid column
90%
→ 10%
ms ~150
general
Weight – Type (Z)DRE 6 kg 2.0
– Type (Z)DREE 6 kg 2.1
Installation position Any
Storage temperature range °C –20 … +80
Ambient temperature range °C –20 … +70
1)
Only available for "Z" version.
2)
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
Proportional pressure reducing valve, pilot operated | DRE(E); ZDRE(E) 7/18
RE 29175, edition: 2013-06, Bosch Rexroth AG
Technical data
(for applications outside these parameters, please consult us!)
electrical
Supply voltage V 24 direct voltage
Minimum control current mA 100
Maximum control current mA 1600
Solenoid coil resistance – Cold value at 20 °C Ω 5
– Maximum hot value Ω 7.5
Switch-on duration % 100
Protection class of the valve according to EN 60529 IP 65 with mating connector mounted and locked
Hydraulic fluid Classification Suitable sealing materials Standards
Mineral oils and related hydrocarbons HL, HLP NBR, FKM DIN 51524
Environmentally compatible
– insoluble in water
HETG NBR, FKM
ISO 15380
HEES FKM
– soluble in water HEPG FKM ISO 15380
Flame-resistant
– sater-free HFDU, HFDR FKM ISO 12922
– containing water HFC (Fuchs Hydrotherm 464
Petrofer Ultra Safe 620)
NBR ISO 12922
Important information on hydraulic fluids!
▶ For more information and data on the use of other hydraulic
fluids refer to data sheet 90220 or contact us!
▶ There may be limitations regarding the technical valve data
(temperature, pressure range, service life, maintenance inter-
vals,etc.)!
▶ The flash point of the process and operating medium used
mustbe at least 40 K higher than the maximum solenoid
surfacetemperature.
▶ Flame-resistant – containing water:
– Maximum operating pressure 210 bar
– Maximum hydraulic fluid temperature 60 °C
– Expected life cycle as compared to HLP hydraulic
oil30%to100%
electrical, integrated electronics (OBE)
Supply voltage – Nominal voltage VDC 24
– Lower limit value VDC 18
– Upper limit value VDC 35
Current consumption A ≤ 1.5
Required fuse protection A 2.0 time-lag
Inputs – Voltage V 0 to 10
– Current mA 4 to 20
Protection class of the valve according to EN 60529 IP 65 with mating connector mounted and locked
Conformity CE according to EMC Directive 2004/108/EC
Tested according to EN 61000-6-2 and EN 61000-6-3
8/18 DRE(E); ZDRE(E) | Proportional pressure reducing valve, pilot operated
Bosch Rexroth AG, RE 29175, edition: 2013-06
Electrical connection (dimensions in mm)
Connector pin assignment Contact Allocation interface "A1" Allocation interface "F1"
Supply voltage 1 24 VDC (u(t) = 21 V to 35 V); I
max
≤
1.5 A
Command value input 2 0 to 10 V; R
E
= 20 kΩ 4 to 20 mA; R
E
= 100 Ω
Weight 3 0 V
4 Reference potential command value
Type (Z)DREE




The connection for the protective earthing
conductor is not provided
Connection cross-section:
4 x 0.75 mm
2
shielded
(connect shield in control cabinet)
M12 plug-in connector port
Connector on amplifier
Mating connector and wire colors with pre-assembled cable set
Please order the cable set separately, see page 18
Brown
+UB
White









Black
Blue
0 V
Proportional pressure reducing valve, pilot operated | DRE(E); ZDRE(E) 9/18
RE 29175, edition: 2013-06, Bosch Rexroth AG
Electrical connection
   







Command value in % →
Characteristic curves (measured with HLP46,
oil
= 40 °C ±5 °C)
Pressure in port A depending on the command value (manufacturing tolerance)
without flow
Type (Z)DRE
Pressure in port A in % →
1)
With type (Z)DRE, the manufacturing tolerance at the
external amplifier (type and data sheet see page 7) can
be adjusted using the command value attenuator potenti-
ometer "Gw". Digital amplifiers are adjusted using the
parameter "Limit".
The control current indicated in the technical data must
not be exceeded!
In order to be able to adjust several valves to the same
characteristic curve, the pressure must - with a command
value of 100 % - not exceed the maximum set pressure of
the relevant pressure rating at any valve.




Connection to mating connector
Connection to connector
Type (Z)DRE





    


Minimum supply
voltage in V →
Length in m →
Connection cable for type (Z)DRE
– Recommendation 6-wire, 0.75 or 1 mm
2
plus
protective earthing conductor and screening
– Only connect the screening to PE on the supply side
– Maximum admissible length = 100 m
The minimum supply voltage at the power supply unit
depends on the length of the supply line (see diagram).
10/18 DRE(E); ZDRE(E) | Proportional pressure reducing valve, pilot operated
Bosch Rexroth AG, RE 29175, edition: 2013-06







    





    





    
Type (Z)DRE: Pressure in port P1 or A depending on the command value
Command value in % →
Pressure in P1 or A in bar →
Command value in % →
Pressure in P1 or A in bar →
Command value in % →
Pressure in P1 or A in bar →
Pressure rating 50 bar Type (Z)DRE Pressure rating 100 bar Type (Z)DRE
Pressure rating 210 bar Type (Z)DRE
Characteristic curves: Type (Z)DRE (measured with HLP46,
oil
= 40 °C ±5 °C)


    





Command value in % →
Pressure in P1 or A in bar →
Pressure rating 315 bar Type ZDRE
Proportional pressure reducing valve, pilot operated | DRE(E); ZDRE(E) 11/18
RE 29175, edition: 2013-06, Bosch Rexroth AG
Type (Z)DRE(E): Pressure in port P1 or A depending on the command value
Characteristic curves: Type (Z)DREE (measured with HLP46,
oil
= 40 °C ±5 °C)
Command value in % →
Pressure in P1 or A in bar →
Pressure rating 210 bar Type (Z)DREE
Command value in % →
Pressure in P1 or A in bar →
Pressure rating 100 bar Type (Z)DREE
Command value in % →
Pressure in P1 or A in bar →
Pressure rating 50 bar Type (Z)DREE







    





    





    
Command value in % →
Pressure in P1 or A in bar →
Pressure rating 315 bar Type ZDREE


    





12/18 DRE(E); ZDRE(E) | Proportional pressure reducing valve, pilot operated
Bosch Rexroth AG, RE 29175, edition: 2013-06


  



  

Characteristic curves (measured with HLP46,
oil
= 40 °C ±5 °C)
Minimum set pressure in port P1 or A with command value 0 V (without counter pressure in channel T)
Pressure rating 50 bar
Pressure rating 100 bar/210 bar
Flow in l/min →
Minimal set pressure
in bar →
Flow in l/min →
Minimal set pressure
in bar →
Type DRE A → T Type DRE P → A
Type ZDRE P1 → T Type ZDRE P → P1
Type DRE A → T Type DRE P → A
Type ZDRE P1 → T Type ZDRE P → P1
Pressure rating 315 bar
Flow in l/min →
Minimal set pressure
in bar →
Type ZDRE P1 → T Type ZDRE P → P1


  





Proportional pressure reducing valve, pilot operated | DRE(E); ZDRE(E) 13/18
RE 29175, edition: 2013-06, Bosch Rexroth AG






  







  






  
Characteristic curves (measured with HLP46,
oil
= 40 °C ±5 °C)
Pressure in channel P1 or A – flow
Pressure rating 50 bar
Flow in l/min →
Pressure in channel P1 or A
in bar →
Pressure rating 100 bar
Flow in l/min →
Pressure in channel P1 or A
in bar →
Pressure rating 210 bar
Flow in l/min →
Pressure in channel P1 or A
in bar →
Type DRE A → T Type DRE P → A
Type ZDRE P1 → T Type ZDRE P → P1
Type DRE A → T Type DRE P → A
Type ZDRE P1 → T Type ZDRE P → P1
Type DRE A → T Type DRE P → A
Type ZDRE P1 → T Type ZDRE P → P1
Pressure rating 315 bar
Flow in l/min →
Pressure in channel P1 or A
in bar →
Type ZDRE P1 → T Type ZDRE P → P1








∆p-q
V
characteristic curves
Pressure differential in bar →
Flow in l/min →
Pressure differential in bar →
Flow in l/min →
Type DRE(E) P → A
Type ZDRE(E) P2 → P1
A1 → A2
B1 → B2
T1 → T2
Notice!
The shown ∆p value corresponds to the minimum pressure
available in port P (P2) minus the maximum pressure to be
controlled in port A (P1).





  




14/18 DRE(E); ZDRE(E) | Proportional pressure reducing valve, pilot operated
Bosch Rexroth AG, RE 29175, edition: 2013-06
Dimensions: Type DRE
(dimensions in mm)
Valve mounting screws and subplates see page 18.
Notice!
The dimensions are nominal dimensions which are
subject to tolerances.












 











 


1 Proportional solenoid without manual override
2 Name plate
3 Valve housing
4 Identical seal rings for ports A, B, P and T
5 Mating connector, separate order, see page 18
6 Space required for removing the mating connector
7 Porting pattern according to ISO 4401-03-02-0-05
8 Proportional solenoid with manual override
0,01/100
Rzmax 4
Required surface quality of the
valve contact surface
Proportional pressure reducing valve, pilot operated | DRE(E); ZDRE(E) 15/18
RE 29175, edition: 2013-06, Bosch Rexroth AG
Dimensions: Type DREE
(dimensions in mm)
Valve mounting screws and subplates see page 18.
Notice!
The dimensions are nominal dimensions which are
subject to tolerances.
0,01/100
Rzmax 4
Required surface quality of the
valve contact surface











 















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1 Proportional solenoid without manual override
2 Name plate
3 Valve housing
4 Identical seal rings for ports A, B, P and T
5 Mating connector, separate order, see page 18
6 Space required for removing the mating connector
7 Porting pattern according to ISO 4401-03-02-0-05
8 Proportional solenoid with manual override
9 Integrated electronics (OBE)
16/18 DRE(E); ZDRE(E) | Proportional pressure reducing valve, pilot operated
Bosch Rexroth AG, RE 29175, edition: 2013-06
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Dimensions: Type ZDRE
(dimensions in mm)
Item explanations see type DRE on page 14,
valve mounting screws and subplates see page 18.
Notice!
The dimensions are nominal dimensions which are
subject to tolerances.
0,01/100
Rzmax 4
Required surface quality of the
valve contact surface
① = component side
② = plate side
Proportional pressure reducing valve, pilot operated | DRE(E); ZDRE(E) 17/18
RE 29175, edition: 2013-06, Bosch Rexroth AG
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Dimensions: Type ZDREE
(dimensions in mm)
Item explanations see type DREE on page 15,
valve mounting screws and subplates see page 18.
Notice!
The dimensions are nominal dimensions which are
subject to tolerances.
0,01/100
Rzmax 4
Required surface quality of the
valve contact surface
① = component side
② = plate side
Bosch Rexroth AG, RE 29175, edition: 2013-06
18/18
DRE(E); ZDRE(E) | Proportional pressure reducing valve, pilot operated
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
© 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.
Dimensions
Accessories (not included in the scope of delivery)
Subplates
Data sheet
Size 6 45052
Hexagon socket head cap screws
Material number
Type DRE(E) 4x ISO 4762 - M5 x 50 - 10.9-flZn-240h-L
(friction coefficient μ
total
= 0.09 to 0.14)
tightening torque M
A
= 7 Nm ±10%
Type ZDRE(E) 4x ISO 4762 - M5 - 10.9-flZn-240h-L
(friction coefficient μ
total
= 0.09 to 0.14)
tightening torque M
A
= 7 Nm ±10%
Notice: The tightening torque of the hexagon socket head cap screws refers to the maximum operating pressure!
Mating connector for type (Z)DRE Data sheet Material number
Mating connector (black) DIN EN 175301-803 08006 R901017011
Proportional amplifier for type (Z)DRE Data sheet Material number
VT-MSPA1-10 in modular design
VT-VSPD-1 in Euro-card format
VT-VSPA1-10 in Euro-card format
30223
30523
30100
R901142355
R901077287
R901152628
Cable sets for type (Z)DREE Material number
Cable set VT-SSPA1-1X/M12/1/V00 Assembled cable with straight mating connector R901241656
Cable set VT-SSPA1-1X/M12/2/V00 Assembled cable with angular mating connector R901241651
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
© 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.
Proportional pressure reducing valve, pilot operated | DRE(E); ZDRE(E) 19/18
RE 29175, edition: 2013-06, Bosch Rexroth AG
Bosch Rexroth AG, RE 29175, edition: 2013-06
20/18
DRE(E); ZDRE(E) | Proportional pressure reducing valve, pilot operated