RE 26564, edition: 2019-01, Bosch Rexroth AG
Pressure reducing valve,
direct operated
Features
▶ For subplate mounting
▶ Porting pattern according to ISO4401-03-02-0-05
(withor without locating hole)
▶ 5pressure ratings
▶ 4 adjustment types, optionally:
– Rotary knob
– Grub screw with hexagon and protective cap
– Lockable rotary knob with scale
– Rotary knob with scale
▶ Check valve, optional
▶ Corrosion-protected design
Contents
Features 1
Ordering code 2
Symbols 3
Function, section 4
Technical data 5
Characteristic curves 6
Dimensions 7, 8
Further information 8
▶ Size6
▶ Component series 5X
▶ Maximum operating pressure 315bar
▶ Maximum flow 60 l/min
RE 26564 
Edition: 2019-01
Replaces: 05.11
H7743
Type DR 6 DP
Inhalt
Features 1
Contents 1
Ordering code 2
Symbols 3
Function, section 4
Technical data
(For applications outside the stated values, please ask us!)
5
Characteristic curves
(measured with HLP46, ϑ
oil
= 40 ±5°C) 6
Dimensions
(dimensions in mm) 7
Dimensions 8
Further information 8
2/8 DR 6 DP | Pressure reducing valve
Bosch Rexroth AG, RE 26564, edition: 2019-01
Ordering code
01 Pressure reducing valve, direct operated, size6 DR 6 DP
Adjustment type
02 Rotary knob 1
Grub screw with hexagon and protective cap 2
Lockable rotary knob with scale 3
1)
Rotary knob with scale 7
03 Component series 50 … 59 (50 … 59: unchanged installation and connection dimensions) 5X
Maximum secondary pressure
04 25bar 25
75bar 75
150bar 150
210bar 210
315bar (Only with adjustment type "2" and without check valve) 315
05 Internal pilot oil supply, external pilot oil return Y
06 With check valve no code
Without check valve M
Corrosion resistance
07 None no code
Improved corrosion protection (240h salt spray test according to ENISO9227); (only version "1" and "2") J3
Seal material (observe compatibility of seals with hydraulic fluid used, see page5)
08 NBR seals no code
FKM seals V
Observe compatibility of seals with hydraulic fluid used.
09 Without locating hole no code
With locating hole /60
2)
With locating hole and locking pin ISO8752-3x8-St /62
10 Further details in the plain text
01 02 03 04 05 06 07 08 09 10
DR 6 DP – 5X / Y *
1)
H-key with the material no. R900008158 is included in the scope
of delivery.
2)
Locking pin ISO8752-3x8-St, material no. R900005694
(separate order)
Notes:
▶ For valve types for use in potentially explosive areas, refer to
datasheet07011.
▶ Preferred types and standard units are contained in the EPS
(standard price list).
Pressure reducing valve | DR 6 DP 3/8
RE 26564, edition: 2019-01, Bosch Rexroth AG
Symbols
Without check valve "M" With check valve "no code"
M
A
PT
(Y)
M
A
PT
(Y)
M
6
T(Y)AP
1825734
4/8 DR 6 DP | Pressure reducing valve
Bosch Rexroth AG, RE 26564, edition: 2019-01
Function, section
Signal and pilot oil are supplied internally via the control
line (6) from channel A.
If the pressure in channel A increases further due to an
external force effect at the actuator, it pushes the control
spool (2) even further against the compression spring (3).
In this way, channel A is connected to the channel T(Y) via
the control edge (8) at the control spool (2). Hydraulic
fluid is discharged into the tank to an extent that the
pressure can only slightly increase.
The leakage oil discharge from the spring chamber (7) is
always effected externally via the channel T(Y).
For the free flow back from channel A to P, acheck
valve(5) can optionally be installed.
A pressure gauge connection (1) allows for the control of
the secondary pressure.
The valve type DR 6 DP is a direct operated pressure
reducing valve in 3-way version, i.e. with pressure
limitation of the secondary circuit.
It is used to reduce a system pressure. The secondary
pressure is set using the adjustment type (4).
The valve is open in initial position. Hydraulic fluid can
flow from channel P to channel A without restrictions. The
pressure in channel A is simultaneously applied via the
control line (6) at the piston area opposite the
compression spring (3). If the pressure in channel
Aexceeds the value set at the compression spring (3), the
control spool (2) moves into control position and keeps
the set pressure in channel A at aconstant level.
Type DR 6 DP1-5X/.Y…
Pressure reducing valve | DR 6 DP 5/8
RE 26564, edition: 2019-01, Bosch Rexroth AG
general
Weight kg ca. 1.2
Installation position any
Ambient temperature range °C –30 … +80 (NBR seals)
–20 … +80 (FKM seals)
MTTF
D
values according to ENISO13849 Years 150 ... 1200 (for more information see datasheet08012)
hydraulic
Maximum operating pressure ▶ Port P bar 315
Maximum secondary pressure ▶ Port A bar 25; 75; 150; 210; 315
Maximum counter pressure ▶ Port T(Y) bar 160
Maximum flow l/min 60
Hydraulic fluid see table below
Hydraulic fluid temperature range °C –30 … +80 (NBR seals)
–20 … +80 (FKM seals)
Viscosity range mm
2
/s 10 … 800
Maximum admissible degree of contamination of the
hydraulic fluid, cleanliness class according to ISO4406 (c)
class 20/18/15
1)
Technical data
(For applications outside the stated values, please ask us!)
1)
The cleanliness classes specified for the components must be
adhered to in hydraulic systems. Effective filtration prevents
faults and simultaneously increases the life cycle of the
components.
For the selection of filters, see www.boschrexroth.com/filter.
Hydraulic fluid Classification Suitable sealing materials Standards Datasheet
Mineral oils HL, HLP, HLPD, HVLP, HVLPD NBR, FKM DIN51524 90220
Bio-degradable ▶ Insoluble in water HETG FKM
ISO15380
90221HEES FKM
▶ Soluble in water HEPG FKM ISO15380
Flame-resistant ▶ Water-free HFDU (glycol base) FKM
ISO12922 90222HFDU (ester base) FKM
HFDR FKM
▶ Containing water HFC (Fuchs: Hydrotherm 46M,
Fuchs Renosafe 500;
Petrofer: Ultra Safe 620;
Houghton: Safe 620;
Union: Carbide HP5046)
NBR
ISO12922 90223
Important information on hydraulic fluids:
▶ For further information and data on the use of other hydraulic
fluids, please refer to the data sheets above or contact us.
▶ There may be limitations regarding the technical valve data
(temperature, pressure range, life cycle, maintenance
intervals,etc.).
▶ The ignition temperature of the hydraulic fluid used must be
50Khigher than the maximum surface temperature.
▶ Bio-degradable and flame-resistant – containing water: If
components with galvanic zinc coating (e.g. version "J3" or "J5")
or parts containing zinc are used, small amounts of dissolved zinc
may get into the hydraulic system and cause accelerated aging of
the hydraulic fluid. Zinc soap may form as achemical reaction
product, which may clog filters, nozzles and solenoid
valves-particularly in connection with local heat input.
▶ Flame-resistant – containing water:
Due to increased cavitation tendency with HFC hydraulic fluids,
the life cycle of the component may be reduced by up to 30% as
compared to the use with mineral oil HLP. In order to reduce the
cavitation effect, it is recommended - if possible specific to the
installation - to back up the return flow pressure in ports T to
approx.20% of the pressure differential at the component.
A →
TP
→ A
0
50
100
150
200
250
300
315
350
4050 20 0204
060
3
2
1
4
5
10
15
20
25
0
10 20 30 40 50 60
0
6/8 DR 6 DP | Pressure reducing valve
Bosch Rexroth AG, RE 26564, edition: 2019-01
Characteristic curves
(measured with HLP46, ϑ
oil
= 40 ±5°C)
Notes:
▶ The curve development is maintained if the pressure is set
lower according to the pressure rating.
▶ The characteristic curves apply to the pressure at the valve
output p
T
= 0 bar across the entire flow range.
1 P → A (minimum pressure differential)
2 A → T(Y) (minimum pressure differential)
3 ∆p only via check valve
4 ∆p via check valve and fully opened control cross-section
Flow in l/min →
Flow in l/min →
Secondary pressure in bar →
Pressure differential in bar →
p
A
-q
V
characteristic curves ∆p-q
V
characteristic curves
Rzmax 4
0,01/100
32145
132
7
G
F
1
F
2
F
3
F
4
T(Y)
P
A
B
1124; 5
6
313
2
1089
11
15 14
39.5
Ø32
189
209
Ø40
50
23318
Ø35
20
40
41
52.5
27.5
199
12.584.5
4 x Ø12.2; 14 4 x Ø5.4
Ø39
6.7
45
Pressure reducing valve | DR 6 DP 7/8
RE 26564, edition: 2019-01, Bosch Rexroth AG
Dimensions
(dimensions in mm)
Required surface quality
ofthe valve contact surface
1 Name plate
2 Adjustment type "1"
3 Adjustment type "2"
4 Adjustment type "3"
5 Adjustment type "7"
6 Space required to remove the key
7 Valve mounting bores
8 Lock nut SW24
9 Hexagon, wrench size10
10 Identical seal rings for ports A, B, P, T(Y)
11 Pressure gauge connection G1/4; 12 deep; internal
hexagonSW6
12 Without check valve
13 With check valve
14 Port B without function
15 Porting pattern according to ISO4401-03-02-0-05
(with or without locating hole); (with locating hole for locking
pin ISO 8752-3x8-St; version "/60")
Notice:
The dimensions are nominal dimensions which are subject
totolerances.
Valve mounting screws and subplates, see page8.
Bosch Rexroth AG, RE 26564, edition: 2019-01
8/8 DR 6 DP | Pressure reducing valve
BoschRexrothAG
Industrial Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 /  40 30 20
my.support@boschrexroth.de
www.boschrexroth.de
©All rights reserved to BoschRexrothAG, also regarding any disposal,
exploitation, reproduction, editing, distribution, as well as in the event
ofapplications for industrial property rights.
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
Subplates (separate order) with porting pattern according
toISO4401-03-02-0-05 see datasheet45100.
Valve mounting screws (separate order)
Size Quantity Hexagon socket head cap screws Material number
6 4 ISO4762 - M5 x 50 - 10.9-CM-Fe-ZnNi-5-Cn-T0-H-B
friction coefficient µ
total
= 0.09 … 0.14; tightening torque M
A
= 7Nm ±10%
R913043758
or
4 UNC 10-24 UNC x 2" ASTM-A574
Friction coefficient µ
total
= 0.19 to 0.24; tightening torque M
A
= 11Nm [8.2 ft-lbs] ±15%
Friction coefficient µ
total
= 0.12 to 0.17; tightening torque M
A
= 8Nm [5.9 ft-lbs] ±10%
R978800693
Further information
▶ Hydraulic valves for industrial applications Operating instructions07600-B
▶ Subplates Data sheet45100
▶ Hydraulic fluids on mineral oil basis Data sheet90220
▶ Environmentally compatible hydraulic fluids Data sheet90221
▶ Flame-resistant, water-free hydraulic fluids Data sheet90222
▶ Flame-resistant hydraulic fluids - containing water (HFAE, HFAS, HFB, HFC) Data sheet90223
▶ Reliability characteristics according to ENISO13849 Data sheet08012
▶ Use of non-electrical hydraulic components in an explosive environment(ATEX) Data sheet07011
▶ Selection of filters www.boschrexroth.com/filter
▶ Information on available spare parts www.boschrexroth.com/spc