RE 25850 

Edition: 2021-10
Replaces: 2019-07

Pressure relief valve,

pilot-operated

Type DB; DBW
▶ Size 52
▶ Component series 3X
▶ Maximum operating pressure 315 bar
▶ Maximum flow 2,000 l/min

H7178

Features Contents

▶ For flange connection Features 1

▶ For subplate mounting Ordering code 2, 3
▶ 3 adjustment types for pressure adjustment, optionally: Symbols 4
– Sleeve with hexagon and protective cap Function, section, symbol 5
– Rotary knob Technical data 6
– Lockable rotary knob Characteristic curves  7
▶ Solenoid-actuated unloading via a built-on directional Dimensions 8 … 10
spool valve Mating connectors 16
▶ Pilot oil return, internal or external General information 16
▶ Remote control port, optional Further information 16
▶ Main spool insert optionally as seat or spool version Type-examination tested safety valve type DB(W)…E,
▶ CE conformity according to the Low-Voltage Directive Component series 3X, according to the
2014/35/EU for electrical voltages > 50 VAC or Pressure Equipment Directive 2014/68/EU
> 75 VDC Ordering code 11
Deviating technical data 12
Deviating dimensions 12
Safety instructions 13
Characteristic curves 14, 15

RE 25850, edition: 2021-10, Bosch Rexroth AG

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Ordering code

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18
DB 52 – 3X / U K4 *

01 Pressure relief valve DB

02 Without directional valve no code ◊

With attached directional valve W◊

03 Size 52 52

04 P T
normally closed A 1)
A B

P T
normally open B 1) ◊
A B

Type of connection
05 Subplate mounting P◊
Flange connection F◊

Adjustment type for pressure adjustment

06 Rotary knob 1
Sleeve with hexagon and protective cap 2◊
Lockable rotary knob 3 2)

Main spool
07 Seat version –

08 Component series 30 … 39 (30 … 39: unchanged installation and connection dimensions) 3X

Pressure rating
09 Set pressure up to 100 bar 100
Set pressure up to 315 bar 315 ◊

Pilot oil supply and pilot oil return (see also Symbols on page 4)
10 Internal pilot oil supply and pilot oil return –◊
External pilot oil supply, internal pilot oil return X
Internal pilot oil supply, external pilot oil return Y
External pilot oil supply and pilot oil return XY

11 Valve for minimum cracking pressure 3 bar U

12 Without directional valve no code ◊

With directional spool valve (data sheet 23178) 6E 1) ◊

13 Direct voltage 24 V G24 1) ◊

AC voltage 230 V 50/60 Hz W230 1)

14 With concealed manual override N9 1) ◊

With manual override N 1)
Without manual override no code

Electrical connection
15 Without mating connector; connector DIN EN 175301-803 K4 1; 3)

Bosch Rexroth AG, RE 25850, edition: 2021-10

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Ordering code

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18
DB 52 – 3X / U K4 *

Seal material (observe compatibility of seals with hydraulic fluid used, see page 7)
16 NBR seals no code ◊
FKM seals V

Equipment Directive
17 Without type-examination procedure no code ◊
Type-examination tested safety valves according to Pressure Equipment Directive 2014/68/EU 4) E

18 For further details, see the plain text

1) Ordering code only necessary with version with mounted

directional valve ("DBW"). Notice: ◊ = Preferred type
2) H-key with material no. R900008158 is included in the scope of
delivery.
3) Mating connectors, separate order, see page 16.
4) See ordering code on page 11.

RE 25850, edition: 2021-10, Bosch Rexroth AG

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Symbols

Type DB…–… Type DB…X… Type DB…Y… Type DB…XY…

P P P P

T T X T Y T X Y

Type DBW…–… Type DBW…X…
P P
P T P T
normally open normally open

A B A B
T T X
P T P T
normally closed normally closed

A B A B

Type DBW…Y… Type DBW…XY…
P P
P T P T
normally open normally open

A B A B
T Y T X Y
P T P T
normally closed normally closed

A B A B

Bosch Rexroth AG, RE 25850, edition: 2021-10

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Function, section, symbol

Pressure valves of type DB and DBW are pilot-operated is thus released. The hydraulic fluid flows from channel P
pressure relief valves. They are used for the limitation (DB) to channel T maintaining the set operating pressure.
or limitation and solenoid-actuated unloading (DBW) of The pressure relief valve can be unloaded by means of
a system pressure. remote control or switched to another pressure value
The pressure relief valves basically consist of the pilot via port X (8).
control valve (1) with pressure adjustment element (2),
main valve (3) with main spool insert (4) and directional Pressure relief valves type DBW
valve (5), optional. The function of this valve is basically the same as that
of valve type DB. The unloading of the main spool (4) is,
Pressure relief valve type DB however, achieved by controlling the mounted directional
The pressure applied by the system acts on the main valve (5).
spool (4). At the same time, pressure is applied to the To reduce the tank pressure peaks when switching to
spring-loaded side of the main spool (4) and to the pilot depressurized circulation by operating the directional
control valve (1) via the control lines (6) which are valve, the main spool in spool version (4.1) can be used.
equipped with nozzles. If the system pressure exceeds the
value set at the spring (7), the poppet (10) of the pilot
control valve opens. The hydraulic fluid on the
spring-loaded side of main spool (4) now flows via the
spring chamber of the pilot control valve (1) to the tank,
either internally via port T, or externally, via port Y. Due to
the combination of jets in the control lines, a pressure
drop results at the main spool, the connection from P to T

5 1 2 7 4.1 4.2 3

Principle:

P X

M
A B

P T

P
10 8 6
Y X T P
Type DBW 52 BP2.3X/…XYU6EG24N9K4

4.1 Spool version

T Y
4.2 Seat version
With version "DBW …Y…", the connection
T–Y is closed.

RE 25850, edition: 2021-10, Bosch Rexroth AG

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Technical data
(For applications outside these values, please consult us!)

General
Weight ▶ DB ... kg approx. 27
▶ DBW ... kg approx. 28.5
Installation position any
Ambient temperature ▶ DB ... °C –30 ... +80 (NBR seals)
range –15 ... +80 (FKM seals)
▶ DBW ... °C –20 ... +50 (NBR seals)
–15 ... +50 (FKM seals)
Conformity ▶ CE according to Low-Voltage Directive EN 60204-1:2006-01 and DIN VDE 0580, classified as component
2014/35/EU tested according to

Hydraulic
Maximum operating ▶ Port P, T, X bar 315
pressure
Maximum counter ▶ Port Y – DB ... bar 315
pressure – DBW …Y bar 210 with DC solenoid
▶ Port T – DBW … bar 160 with AC solenoid
Minimum set pressure bar flow-dependent (see characteristic curves page 6)
Maximum set pressure bar 100; 315
Maximum flow l/min 2000
Hydraulic fluid see table page 7
Hydraulic fluid temperature range °C –20 ... +80 (NBR seals)
–15 ... +80 (FKM seals)
Viscosity range mm2/s 10 ... 380
Maximum admissible degree of contamination of the Class 20/18/15 1)

hydraulic fluid, cleanliness class according to ISO 4406 (c)

1) The cleanliness classes specified for the components must be

adhered to in hydraulic systems. Effective filtration prevents faults Notice:
and at the same time increases the life cycle of the components. ▶ Technical data for directional spool valve
see data sheet 23178.
▶ Technical data for connection flange see data sheet 45501.
▶ Deviating technical data for type-examination tested safety
valves can be found on page 12.

Bosch Rexroth AG, RE 25850, edition: 2021-10

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Technical data
(For applications outside these values, please consult us!)

Hydraulic fluid Classification Suitable sealing Standards Data sheet

materials
Mineral oils HL, HLP, HLPD, HVLP, HVLPD NBR, FKM DIN 51524 90220
Bio-degradable ▶ Insoluble in water HETG FKM
ISO 15380
HEES FKM 90221
▶ Soluble in water HEPG FKM ISO 15380
Flame-resistant ▶ Water-free HFDU (glycol base) FKM
HFDU (ester base) FKM ISO 12922 90222
HFDR FKM
▶ Containing water HFC (Fuchs: Hydrotherm 46M, NBR
Renosafe 500;
Petrofer: Ultra Safe 620; ISO 12922 90223
Houghton: Safe 620;
Union: Carbide HP5046)
▶ Flame-resistant – containing water:
Important notices on hydraulic fluids:
– Due to the increased cavitation tendency with HFC hydraulic
▶ For further information and data on the use of other hydraulic
fluids, the life cycle of the component may be reduced by
fluids, please refer to the data sheets above or contact us.
up to 30% as compared to the use with mineral oil HLP.
▶ There may be limitations regarding the technical valve data
In order to reduce the cavitation effect, it is recommended – if
(temperature, pressure range, life cycle, maintenance
possible specific to the installation – backing up the return
intervals, etc.).
flow pressure in ports T to approx. 20% of the pressure
▶ The ignition temperature of the hydraulic fluid used must be 50 K
differential at the component.
higher than the maximum surface temperature.
▶ Bio-degradable and flame-resistant – containing water: If – Dependent on the hydraulic fluid used, the maximum ambient
components with galvanic zinc coating (e.g. version "J3" or "J5") and hydraulic fluid temperature must not exceed 50 °C. In order
or parts containing zinc are used, small amounts of dissolved zinc to reduce the heat input into the component, a maximum duty
may get into the hydraulic system and cause accelerated aging of cycle of 50% in continuous operation has to be set for on/off
the hydraulic fluid. Zinc soap may form as a chemical reaction valves (measuring time 300 s). If this is not possible due to the
product, which may clog filters, nozzles and solenoid function, an energy-reducing control of these components is
valves – particularly in connection with local heat input. recommended, e.g. via a PWM plug-in amplifier.

Characteristic curves
(measured with HLP46, ϑoil = 40 ±5 °C)

Inlet pressure dependent on the flow Minimum set pressure dependent on the flow 1)
12
Inlet pressure in bar →

300
Minimum set pressure

10

8
in bar →

200
6

4
100
2

0 400 800 1200 1600 2000 0 400 800 1200 1600 2000
Flow in l/min → Flow in l/min →

1) The characteristic curves apply for output pressure pT = 0 bar in

Notice: the entire flow range
The characteristic curves were measured with external,
depressurized pilot oil return.
With internal pilot oil return, the inlet pressure increases by the
output pressure present in port T.

RE 25850, edition: 2021-10, Bosch Rexroth AG

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Dimensions: Subplate mounting

(dimensions in mm)

9 17 22 21 23 24 8 9
216.5 50.5
202.5
199

15
15

6 7

91.5 (98)
85.5 (92)

11 5 1
11
10 10

Ø25.1H11

Ø34
61

44 M8 x 1

Y Y
3
SW6
SW19
12
SW30
T T
Ø60H11

X
Ø50

SW32
135
182

100±0.2
101

77
50±0.2

Ø6

P 15
P
25

25
30

16 G1; 18 14
40
115±0.2 Ø41; 7
Ø26
154 5 84
Ø18 130
18
150
0.01/100 207
142
Rz1max 8
218

Required surface quality of the valve SW19

SW32
contact surface for installation of the 12
valve without subplate.
Ø60

2 11 19
Notice:
Please use the existing mounting bores to fix the valve so that
4
28
the reaction forces can be absorbed in a risk-free manner.

Item explanations can be found on page 10.

Ø60

Deviating dimensions for version "E" see page 12.

11 19
SW32 59 20
12 SW30
Bosch Rexroth AG, RE 25850, edition: 2021-10
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Dimensions: Flange connection

(dimensions in mm)

22 21 23 24 8 9
216.5 50.5
9 202.5
199

15
15

31 60
6 7

91.5 (98)
85.5 (92)

11 5 1
11
10 10
Ø34
G1/2; 14

Ø34
61

X Y
20

4 x M16 3
SW6
T SW19 12
45°

Ø20
T SW30
Ø14 ±2
98 SW32
182
100±0.2

45°
77

Ø45

P P 15
25
30

13
G1; 18 74
Ø41; 7 84
18 115±0.2 130
148 150
14
207
142
218

SW32 SW19
12
Ø60

2 11
19
Notice: 4
Please use the existing mounting bores to fix the valve so that 28
the reaction forces can be absorbed in a risk-free manner.
Ø60

Item explanations can be found on page 10.

Deviating dimensions for version "E" see page 12.
11 19
59
SW32
12 SW30 20

RE 25850, edition: 2021-10, Bosch Rexroth AG

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Dimensions

1 Pilot control valve Valve mounting screws (separate order)

▶ Subplate mounting
2 Adjustment type "1"
6 hexagon socket head cap screws ISO 4762 - M16 x 150 - 10.9
3 Adjustment type "2" (friction coefficient µtotal = 0.09 … 0.14)
4 Adjustment type "3" Tightening torque MA = 229 Nm ±10%
5 Main valve Material no. R913000154

6 Directional spool valve NG6, see data sheet 23178

▶ Flange connection
7 Mating connector without circuitry for connector "K4"
2 hexagon socket head cap screws ISO 4762 - M12 - 10.9
(separate order, see page 16 and data sheet 08006)
8 Mating connector with circuitry for connector "K4"
(separate order, see page 16 and data sheet 08006) Connection flanges (separate order), see data sheet 45501
9 Space required for removing the mating connector
10 Dimension for valve with DC solenoid
11 Dimension () for valve with AC solenoid
12 Lock nut, tightening torque MA = 10+5 Nm
13 Connection flanges (T and P), see data sheet 45501
14 Pressure gauge connection, tightening torque
MA = 225 Nm ±10%
15 Name plate
16 Identical seal rings for ports P and T
17 Identical seal rings for ports X and Y
18 Valve mounting bores
19 Maximum dimension with unloaded valve
20 Space required to remove the key
21 Dimension for valve with manual override "N"
22 Dimension for valve with concealed manual override "N9"
23 Dimension for valve without manual override
24 Space required to remove the coil
25 Locking pin

Bosch Rexroth AG, RE 25850, edition: 2021-10

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Ordering code: Type-examination tested safety valves, version "DB(W)…E" 1)

Maximum flow qVmax in l/min Set response

with pilot oil return overpressure
Designation Component marking external "Y" internal "–" p in bar
2 3 4 5 6 7
TÜV.SV. – 734.46.F.G.p 1000 500 50 … 110
DB 52 3X/ U E
1500 1000 111 … 210
1 2 3 4 5 6 7 8
2000 1500 211 … 315
DBW 52 3X/ U6 E TÜV.SV. – 734.46.F.G.p

1 Directional valve, normally closed A

Directional valve, normally open B

2 Subplate mounting P
Flange connection F

Adjustment type for pressure adjustment

3 Rotary knob (pressure adjustment sealed, unloading or setting of a lower response pressure possible) 1
With sealed protective cap (no adjustment/unloading possible) 2

Main spool
4 Seat version –
Spool version L

Pressure
5 To be entered by the customer, e.g. pressure adjustment ≥ 50 bar and in 5 bar steps possible e.g. 150

Pilot oil supply and pilot oil return

6 Internal pilot oil supply and pilot oil return – 2; 3)
Pilot oil supply internal, pilot oil return external (recommendation) Y 3)

Electrical specifications
7 See page 2 e.g.
EG24N9K4

Seal material
8 NBR seals no code
FKM seals V

Value entered at the factory

1) Component series 3X, according to the Pressure Equipment

Directive 2014/68/EU
2) Dash "–" only necessary with version with attached directional
valve (DBW)
3) External pilot oil supply "X" not possible!

RE 25850, edition: 2021-10, Bosch Rexroth AG

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Deviating technical data: Type-examination tested safety valves, version "DB(W)…E" 1)

General
Conformity CE according to Pressure Equipment Directive 2014/68/EU

Hydraulic
Version "DB../.." "DB../..Y" "DBW../.." "DBW../..Y"
Maximum counter pressure ▶ Port Y bar – 0 – 0
▶ Port T bar 2) pT < 15 2) pT < 15
Maximum flow see table page 11 as well as characteristic curves page 14 … 15
Hydraulic fluid Mineral oil (HL, HLP) according to DIN 51524
Hydraulic fluid temperature range (= TS) °C –10 … +60
Viscosity range mm2/s 12 … 230

1) Component series 3X, according to Pressure Equipment Directive

2014/68/EU (For applications outside these parameters,
please consult us!)
2) See characteristic curves and explanatory notes for maximum
admissible counter pressures on page 14 … 15

Deviating dimensions: Type-examination tested safety valves, version "DB(W)…E" 1)

(dimensions in mm)

Ø60
11

Ø34

SW19 1.2
2
83

80

1.1

1.1 Adjustment type "1" – rotary knob

1.2 Adjustment type "2", hexagon with safety cap
2 Lock nut, tightening torque MA = 10+5 Nm

Bosch Rexroth AG, RE 25850, edition: 2021-10

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Safety instructions: Type-examination tested safety valves, version "DB(W)…E" 1)

▶ Before ordering a type-examination tested safety valve,

Application notes must always be observed
it must be observed that for the desired response
▶ In the plant, the response pressure specified in the
overpressure p, the maximum admissible flow qV max
component marking is set with a flow of 12 l/min
of the safety valve must be larger than the maximum
(version "Y" with 9 l/min).
possible flow of the system/accumulator to be secured.
▶ The maximum admissible flow stated in the component
▶ According to the Pressure Equipment Directive
marking (= numerical value instead of the character "G"
2014/68/EU, the increase in the system pressure due to
in the component marking, see page 11) must not be
the flow must not exceed 10% of the set response
exceeded.
pressure (see component marking page 11).
It applies to:
▶ Discharge lines (ports T and Y) of safety valves must
– Pilot oil return external ("Y") without counter
end in a risk-free manner. An accumulation of fluids in
pressure in the discharge line Y; admissible counter
the discharge system must not be possible
pressure in the discharge line (port T) < 15 bar
(see data sheet AD2000 A2).
– Pilot oil return internal ("no code"). The maximum
▶ If a lead seal at the safety valve is removed, the
flow is only admissible without counter pressure
approval according to the PED becomes void.
in the discharge line (port T).
▶ The requirements of the Pressure Equipment Directives
2014/68/EU and of data sheet AD2000 A2 must be
With internal pilot oil return, the system pressure
generally observed!
increases by the counter pressure in the discharge
line (port T) with increasing flow (observe AD2000 -
data sheet A2 - item 6.3).
To ensure that this increase in system pressure caused
by the flow does not exceed 10% of the set response
pressure, the admissible flow has to be reduced
dependent on the counter pressure in the discharge
line (port T) see diagrams page 14 … 15).

Notice:
Possible unloading via the directional valve must not be
applied for safety-relevant functions. If unloading is
required for safety-relevant functions, an additional
safety valve must be installed.

1) Component series 3X, according to the Pressure Equipment

Directive 2014/68/EU

RE 25850, edition: 2021-10, Bosch Rexroth AG

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Characteristic curves: Counter pressure in the discharge line

In principle, the valve should be operated without counter Interpolation of intermediate values from the diagram
pressure in the discharge line, if possible. In case of 1. At the axis pT, mark 1/10 of the value of pA.
counter pressure in the discharge line, the maximum 2. Determine the next lower and the next higher
possible flow is reduced. There is a relationship between characteristic curve for this point. The point marked
maximum counter pressure pT in the discharge line and at pT divides the section between lower and higher
flow qV, which can be seen from the following characteristic curve on the pT axis with a certain
characteristic curve. Characteristic curves for intermediate percentage.
values of the response pressure which are not listed 3. At the qVmax axis, divide the section between next lower
must be determined by means of interpolation. and next higher characteristic curve in the same
When the flow approaches zero, the maximum counter percentage as the section at the pT axis. From the zero
pressure pT is in each case 10% of the response pressure. position flow on the qVmax axis determined in that way,
With increasing flow, the maximum counter pressure draw a straight line to the value on the pT axis marked
pT decreases. before.
4. Mark the system flow to be secured at the qVmax axis.
5. Read off the maximum counter pressure for this value
using the line at the pT axis drawn before.

Bosch Rexroth AG, RE 25850, edition: 2021-10

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Characteristic curves: Counter pressure in the discharge line

Diagram for determining the maximum counter pressure pT in the discharge line at port T of the valve dependent on the
flow qVmax for valves DB(W) …-3X/…E with different response pressures pA.

pA pT
in bar in bar
Characteristic Response
curves pressure pA
31,5
in bar
300 30 1 50
2 110
3 115
4 210
21,5 5 215
21 6 315
200 20
Characteristic curves for
6 intermediate values can be
generated by interpolation.
150 15
5 Further explanations can be
found on page 14 and 15.
11,5
11
100 10
4
3
5
1 2

0
0 500 1000 1500
Flow in l/min →

pA Response pressure in bar Determination of the maximum counter pressure

pT Maximum counter pressure in the discharge line (port T)

Example 1 (with already existing characteristic curve):
in bar
Flow of the system / accumulator to be secured: qVmax = 500 l/min
(sum of all possible counter pressures; also see AD2000
Safety valve set to: pA = 210 bar.
data sheet - A2)
Read off the maximum counter pressure pT of approx. 10 bar from
pT max = 10% x pA (with qV = 0 l/min) according to PED
the diagram (see arrows, dashed line " ").
2014/68/EU
qVmax Maximum flow in l/min Example 2 (with interpolated characteristic curve):
Flow of the system / accumulator to be secured: qVmax = 500 l/min
Safety valve set to: pA = 150 bar.
Value to be marked at the axis referred to as
pT: 1/10 x 150 bar = 15 bar.
Read off the maximum counter pressure pT of approx. 7.5 bar from
the diagram (see arrows, dashed/dotted line " ").

RE 25850, edition: 2021-10, Bosch Rexroth AG

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Accessories (separate order)

Mating connectors and cable sets

Pos. Designation Version Short Material Data sheet
1) designation number
7, 8 Mating connector; Without circuitry, M16 x 1.5, 12 … 240 V, "a" Z4 R901017010 08006
for valves with "K4" connector, Without circuitry, M16 x 1.5, 12 … 240 V, "b" R901017011
2-pole + PE, design A
With indicator light, M16 x 1.5, 12 … 240 V Z5L R901017022
With rectifier, M16 x 1.5, 80 … 240 V RZ5 R901017025
With indicator light and Z-diode-suppressor, Z5L1 R901017026
M16 x 1.5, 24 V

1) See dimensions on page 8 and 9.

General information
▶ The unloading function (directional valve function with Example:
version "DBW") must not be used for safety functions! Pressure adjustment of the valve by spring preload
▶ With version "B", the lowest adjustable pressure (item 7 on page 5) in the pilot control valve/adjustment
(circulation pressure) is set in case of power failure or type pspring = 200 bar
cable break. With version "A", the pressure limiting
function is set in case of power failure or cable break. Hydraulic counter pressure in port T with internal pilot oil
▶ Hydraulic counter pressures in port T with internal pilot return phydraulic  = 50 bar
oil return and/or port Y with external pilot oil return
add 1:1 to the response pressure of the valve set at the => Response pressure = pspring +  phydraulic = 250 bar
pilot control.

Further information

▶ Directional spool valve Data sheet 23178

▶ Connection flanges Data sheet 45501
▶ 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
▶ Hydraulic valves for industrial applications Operating instructions 07600-B
▶ General product information on hydraulic products Data sheet 07008
▶ Assembly, commissioning and maintenance of industrial valves Data sheet 07300
▶ Information on available spare parts www.boschrexroth.com/spc

Bosch Rexroth AG © All rights reserved to Bosch Rexroth AG, also regarding any disposal,

Industrial Hydraulics exploitation, reproduction, editing, distribution, as well as in the event of
Zum Eisengießer 1 applications for industrial property rights.
97816 Lohr am Main, Germany The data specified above only serve to describe the product. No statements
Phone +49 (0) 93 52 / 40 30 20 concerning a certain condition or suitability for a certain application can be
my.support@boschrexroth.de derived from our information. The information given does not release the user
www.boschrexroth.de 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.

Bosch Rexroth AG, RE 25850, edition: 2021-10