RE25715, edition: 2022-05, Bosch Rexroth AG
Features
▶ Screw-in cartridge valve
▶ 6 pressure ratings
▶ 4 adjustment types, optionally:
– Hexagon (partially with protective cap)
– Rotary knob with scale
– Lockable rotary knob with scale
– Hand wheel
▶ Corrosion-protected design
Contents
Features 1
Ordering code 2
Function, section, symbol 3
Technical data 4
Characteristic curves 5
General information 5
Dimensions 6
Mounting cavity 7
Accessories 8
Further information 8
▶ Size2
▶ Component series 2X
▶ Maximum operating pressure 420bar
▶ Maximum ow 2l/min
H8070
Pressure relief valve,
direct operated
DBD .. K
RE25715
Edition: 2022-05
Replaces: 2020-10
Inhalt
Features 1
Contents 1
Ordering code 2
Function, section, symbol 3
Technical data
(For applications outside these values, please consult
us!) 4
Characteristic curves
(measured with HLP46, ϑ
oil
=40 ±5°C) 5
Dimensions
(dimensions in mm) 6
Mounting cavity: DBD. 2K; 2 main ports; thread M24x1.5
(dimensions in mm) 7
Accessories 8
Further information 8
2/8 DBD..K | Pressure relief valve
BoschRexrothAG, RE25715, edition: 2022-05
Ordering code
01 Pressure relief valve, direct operated DBD
Adjustment type
02 Hexagon with protective cap S
1)
Rotary knob with scale L
Lockable rotary knob with scale A
Hand wheel H
03 Size2 2
04 Screw-in cartridge valve K
05 Component series 20…29(20…29: unchanged installation and connection dimensions) 2X
Pressure rating
06 Set pressure up to 25bar 25
Set pressure up to 50bar 50
Set pressure up to 100bar 100
Set pressure up to 200bar 200
Set pressure up to 315bar 315
Set pressure up to 420bar 420
Set pressure
07 Without setting no code
Set, adjustable – …
2)
Set; sealed, not adjustable (only with adjustment type "S") P …
2); 3)
Corrosion resistance
08 None no code
High corrosion protection(720h salt spray test according to ENISO9227) (only with adjustment type "S") J5
1)
Seal material (observe compatibility of seals with hydraulic uid used, seepage4)
09 NBR seals no code
FKM seals V
Low-temperature version (only with adjustment type "S") MT
10 Further details in the plain text *
01 02 03 04 05 06 07 08 09 10
DBD 2 K 2X / *
1)
Protective cap for version "J5" not included in the scope
of delivery.
Protective cap available as individual part (material
no.R900135501)
2)
Specify set pressure (smallest setting interval 10 bar)
Order example:
Set pressure 280 bar, adjustable→DBDS 2 K2X/315-180
Set pressure 140 bar, sealed→DBDS 2 K2X/200P140
3)
Not with version "J5"
1
2
51234
6
Pressure relief valve | DBD..K 3/8
RE25715, edition: 2022-05, Bosch Rexroth AG
Pressure valve typeDBD.. K refers to direct operated
pressure relief valves to be installed in block designs.
They are used to limit a system pressure. The system
pressure can be set steplessly via the adjustment type(5).
In the initial position the valve is closed. Via control
line(1) and ball(2), the pressure in the main port ① acts
on the spring plate(3). If the pressure in the main port ①
rises above the value set at the compression spring(4),
the ball(2) opens and the hydraulic fluid flows into the
main port ②.
Version "P":
Pressure adjustment with lead seal and protective cap(6)
for adjustment type "S".
Function, section, symbol
①=Main port1 (P)
②=Main port2 (T)
Type DBDS 2 K2X/…(P)…
4/8 DBD..K | Pressure relief valve
BoschRexrothAG, RE25715, edition: 2022-05
Technical data
(For applications outside these values, please consult 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 com-
ponents.
For the selection of filters, seewww.boschrexroth.com/filter.
Hydraulic
Maximum operating pressure ▶ Input bar 420
▶ Output bar 315
Maximum set pressure bar 25; 50; 100; 200; 315; 420
Maximum flow l/min 2 (recommended 1.5)
Hydraulic fluid seetable below
Hydraulic fluid temperature range °C see "ambient temperature range"
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)
General
Weight kg approx.0.3
Installation position any
Ambient temperature range °C –30 ... +80 (NBR seals)
–20 … +80 (FKM seals)
-45…+70 (low-temperature version)
MTTF
D
values according to ENISO13849 years 150 ... 1200 (for more information seedata sheet08012)
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,
Renosafe500;
Petrofer: UltraSafe620; Hough-
ton: Safe620;
Union: CarbideHP5046)
NBR
ISO12922 90223
Important information on hydraulic uids:
▶ 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 the 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 compo-
nent.
0 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,8 2,0
50
100
150
200
250
300
350
400
450
Pressure relief valve | DBD..K 5/8
RE25715, edition: 2022-05, Bosch Rexroth AG
Operating pressure inbar →
Flow inl/min →
Characteristic curves
(measured with HLP46, ϑ
oil
=40 ±5°C)
p-q
V
characteristic curves
Notes:
▶ The characteristic curves apply for output pressure p
T
= 0 bar
in the entire flow range and were measured without housing
resistance.
▶ Hydraulic counter pressures in the main port2 (T) add 1:1 to
the response pressure of the valve set in the adjustment type.
Example:
– Pressure adjustment of the valve due to spring preload (item
4 on page3) p
spring
=200bar
– Hydraulic counter pressure in the main port2 (T):
p
hydraulic
=50bar
– ⇒ Response pressure=p
spring
+ p
hydraulic
=250bar
▶ The characteristic curves shown are determined with the
associated p
max
version ("pressure rating").
▶ The characteristic curves apply for operation as individual
assembly "DBDx 2". If used as pilot control valve, the cracking
pressure of the overall assembly (e.g. 2/2 directional cartridge
valve) is not necessarily identical to the one of a set pilot
control cartridge.
▶ Pressure adjustments are made with a test stand quantity of
Q=1 l/min
1.2
1.4
1.3
1.1
2
2
2
3
4
3
3
4
SW22
SW22
SW10
SW30
Ø30
Ø30
Ø35
1
max. 80
max. 52
24
42
32,5
18
6/8 DBD..K | Pressure relief valve
BoschRexrothAG, RE25715, edition: 2022-05
Dimensions
(dimensions in mm)
1.1 Adjustment type"S", hexagon with protective cap
1.2 Adjustment type"L", rotary knob with scale
1.3 Adjustment type"A", lockable rotary knob with scale
1.4 Adjustment type"H", hand wheel
2
Lock nut
3 Hexagon SW30, tightening torque when screwing in
M
A
=60
+5
Nm
4 Embossed typedesignation
①=Main port1 (P)
②=Main port2 (T)
Rz1max 8
Rz1max 8
M24 x 1.5
Ø28H7
Rz 32
+0.4‒0.2
0.02
A
A
max Ø10.5
0.0025- / Ptmax 20
11.5
1
27.5
min 8
1)
max. Ø8.6
15.5
+0.5
32.5
+0.2
1 x 45°
30°
1
2
Pressure relief valve | DBD..K 7/8
RE25715, edition: 2022-05, Bosch Rexroth AG
Mounting cavity: DBD. 2K; 2 main ports; thread M24x1.5
(dimensions in mm)
①=Main port1 (P)
②=Main port2 (T)
1)
Depth of fit
BoschRexrothAG, RE25715, edition: 2022-05
8/8 DBD..K | Pressure relief valve
© 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 specied 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 verication.
It must be remembered that our products are subject to anatural process of
wear and aging.
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
Further information
▶ Hydraulic uids on mineral oil basis Datasheet90220
▶ Environmentally compatible hydraulic uids Datasheet90221
▶ Flame-resistant, water-free hydraulic uids Datasheet90222
▶ Flame-resistant hydraulic uids - containing water (HFAE, HFAS, HFB, HFC) Datasheet90223
▶ Hydraulic valves for industrial applications Operating instruc-
tions07600-B
▶ General product information on hydraulic products Datasheet07008
▶ Use of non-electrical hydraulic components in explosive atmospheres (ATEX) Datasheet07011
▶ Assembly, commissioning and maintenance of industrial valves Datasheet07300
▶ Selection of lters www.boschrexroth.com/filter
▶ Information on available spare parts www.boschrexroth.com/spc
Cap element for use in the mounting cavity "DBD..2K"
Sealing material Material no.
Free passage "P to T" NBR R900737632
Connection "P to T" blocked NBR R900765751
Accessories
Notice:
▶ FKM upon request