Inhalt
Table of contents 1
Features 1
Ordering code, symbols 2
Function, section 3
Technical data 4
Characteristic curve (measured with HLP 46; J
oil
= 40 °C ±
5°C
,
ν = 35 mm
2
/s) 4
Unit dimensions (dimensions in mm) 5
Unit dimensions (dimensions in mm) 6
Unit dimensions (dimensions in mm) 7
Examples of application 8
1/8
Pressure relief valve
(Pilot control valve)
Type (Z)DBT/DZT
Size 6
Component series 1X
Maximum operating pressure 315 bar
Maximum flow 3 l/min
RE 25724/03.10
Replaces: 01.05
Table of contents
Contents Page
Features 1
Ordering code, symbols 2
Function, section 3
Technical data 4
Characteristic curve 4
Unit dimensions 5 to 7
Examples of application 8
Features
– Directly operated valve for the limitation of the system
pressure
– Application as pilot control valve
– For plate and control panel mounting
Information on available spare parts:
www.boschrexroth.com/spc
Type ZDBT
TB 0240
2/8 Bosch Rexroth AG Hydraulics (Z)DBT / DZT RE 25724/03.10
Ordering code, symbols
Type Material no. Examples of application Symbols
DBT–G1–1X/160 0 811 104 007
P
T
DBT–G1–1X/315 0 811 104 013 For control panel
DBT–G7–1X/160
0 811 104 021
DBT–XP8–1X/160 0 811 104 100
DBT–XP8–1X/315 0 811 104 101
DBT–XP2–1X/160 0 811 104 102
DBT–XP2–1X/315 0 811 104 103 Sandwich plate for
subplate mounting
DBT–XP7–1X/160 0 811 104 104
DBT–XP7–1X/315 0 811 104 105
DBT–XP3–1X/160 0 811 104 106
DBT–XP3–1X/315 0 811 104 107
DBT–XP1–1X/160 0 811 104 108
DBT–XP1–1X/315 0 811 104 109
ZDBT–XP8–1X/160 0 811 104 110
ZDBT–XP8–1X/315 0 811 104 111
ZDBT–XP2–1X/160 0 811 104 112 Sandwich plate for
subplate mounting
ZDBT–XP2–1X/315 0 811 104 113
ZDBT–XP7–1X/160 0 811 104 114
ZDBT–XP7–1X/315 0 811 104 115
ZDBT–XP3–1X/160 0 811 104 116
ZDBT–XP3–1X/315 0 811 104 117
ZDBT–XA8–1X/160 0 811 104 118
A
T
ZDBT–XA8–1X/315 0 811 104 119 For subplate
mounting
ZDBT–XA2–1X/160 0 811 104 120
ZDBT–XA2–1X/315
0 811 104 121
Low pressure
High pressure
DZT–XB2–1X/315 0 811 104 123
Pressure cut-off valve for subplate mounting
P
B
T
DZT–XB2–1X/60 0 811 104 124
DZT–XA2–1X/60 0 811 104 125
P
A
T
DZT–XA2–1X/160 0 811 104 126
DZT–XA2–1X/315
0 811 104 127
52
P
3
1
4
Hydraulics Bosch Rexroth AGRE 25724/03.10 (Z)DBT / DZT 3/8
Function, section
If the hydraulic force equals the force set at the adjusting el-
ement (4), the valve controls the set pressure. As the valve
poppet (2) lifts off the valve seat (3), the excess pressure fluid
can flow off from P to T.
If the spring (5) is completely without load, a minimal pressure
of 3 bar (spring pretensioning force) is reached.
These valves are basically used as pilot control valves for the
indirect control of major flow.
Type DBT pressure relief valves are seat design remote con-
trol valves and allow for the limitation of the system pressure.
The valve is adjusted manually by the adjusting device (4).
The valves basically consist of housing (1),
valve poppet (2)
and corresponding valve seat (3). In unloaded position, the
valve poppet (2) applies pressure to the valve seat (3) locking
the connection between P and T port.
Type DBT-XP2-1X
20
10
15
0
5
0 1 2 3 4
4/8 Bosch Rexroth AG Hydraulics (Z)DBT / DZT RE 25724/03.10
Technical data
general
Installation position Any
Storage temperature range °C –20...+80
Ambient temperature range °C –20...+70
Weight kg 2.0
hydraulic (measured with HLP 46; J
oil
= 40 °C ± 5 °C, ν = 35 mm
2
/s)
Maximum operating
pressure
– Port P bar 350
Maximum set
pressure
– Pressure rating 60 bar bar 60 (only possible for type DZT)
– Pressure rating 160 bar bar 160
– Pressure rating 315 bar bar 315
– Pressure rating 350 bar bar 350
Minimal set pressure bar 3
Return flow – Port T bar Separately depressurized to the tank
Maximum flow l/min 3
Hydraulic fluid Mineral oil (HL, HLP) according to DIN 51524
Other hydraulic fluids upon request!
Hydraulic fluid temperature range °C –20...+80
Viscosity range mm
2
/s 15...380
Max admissible degree of contamination of the hydraulic
fluid - cleanliness class according to ISO 4406 (c)
Class 20/18/15
1)
Hysteresis % < 5 of the max. set pressure
Control oil volume (V
x
) (only pressure on/off valves)
cm
3
< 0,5
Characteristic curve (measured with HLP 46; J
oil
= 40 °C ± 5°C
,
ν = 35 mm
2
/s)
Δp = f (q
V
)
1)
The cleanliness classes specified for the components must
be adhered to in hydraulic systems. Effective filtration pre-
vents faults and at the same time increases the service life
of the components.
For the selection of filters, see data sheets 50070, 50076,
50081, 50086, 50087 and 50088.
Flow in l/min
→
Pressure differential in bar →
45
105,5
95,5
70
G
1
/4
40
5,5
G
3
/8
5 2
R
P
314
6,5
ø
4 x
57
ø
73
ø
23
ø
64
ø
44
ø
45
ø
24
ø
Hydraulics Bosch Rexroth AGRE 25724/03.10 (Z)DBT / DZT 5/8
Unit dimensions (dimensions in mm)
Type DBT-G1-1X/...
Valve mounting screws (separate order)
4 M6 hexagon socket head cap screws
Screw length as required
1 Hand wheel
2 Rotary knob
3 Valve mounting bores
4 Pressure gauge connection
5 Lock nut
48
114,5
30
8,25
60,5
49
41
24
5
2
P
T
3
14
25
0,01/100
Rt 4
6
47
F
1
T
P
F
2
F
4
F
3
15
8
72
72
6/8 Bosch Rexroth AG Hydraulics (Z)DBT / DZT RE 25724/03.10
Unit dimensions (dimensions in mm)
Type DBT-X...
Type ZDBT-X...
1 Name plate or second flange surface
2 Adjustment type
3 Lock nut
4 Valve mounting bores
5 O-rings Ø9.25 x 1.78 (P, T ports)
6 Machined valve mounting face,
porting pattern according to ISO 4401-03-02-0-05.
Subplates according to data sheet 45052
(separate order)
Required surface quality of the
valve mounting face
Valve mounting screws (separate order)
– Type DBT
4 hexagon socket head cap screws
ISO 4762-M5x50-10.9-flZn-240h-L
(friction coefficient µ
total
= 0.09 – 0.14);
Tightening torque M
A
= 7 Nm ±10 %
or
4 hexagon socket head cap screws ISO 4762-M5x50-10.9
(friction coefficient µ
total
= 0.12 – 0.17);
Tightening torque M
A
= 8.9 Nm ±10 %
– Type ZDBT
4 hexagon socket head cap screws
ISO 4762-M5-10.9-flZn-240h-L
(friction coefficient µ
total
= 0.09 – 0.14);
Tightening torque M
A
= 7 Nm ±10 %
or
4 hexagon socket head cap screws ISO 4762-M5-10.9
(friction coefficient µ
total
= 0.12 – 0.17);
Tightening torque M
A
= 8.9 Nm ±10 %
Screw length as required
8,25
7
APBT
0,01/100
Rt 4
8
47
F
1
T
P
F
2
F
4
F
3
15
8
2,5
72
AB
48
121
65
30 37
32
6
T
P
AB
53
25
ø
4 5
1
Hydraulics Bosch Rexroth AGRE 25724/03.10 (Z)DBT / DZT 7/8
Type DZT-X...
Unit dimensions (dimensions in mm)
1 Name plate
2 Adjusting element
3 Lock nut
4 Valve mounting bores
5 Pressure gauge connection for control pressure X, G1/4
6 Pressure gauge connection for system pressure A, G1/4
7 O-rings Ø10 x 1.5 (ports P, A, B, T)
8 Machined valve mounting face,
porting pattern according to ISO 4401-03-02-0-05.
Subplates according to data sheet 45052
(separate order)
Valve mounting screws (separate order)
4 hexagon socket head cap screws
ISO 4762-M5x50-10.9-flZn-240h-L
(friction coefficient µ
total
= 0.09 – 0.14);
Tightening torque M
A
= 7 Nm ±10 %
or
4 hexagon socket head cap screws ISO 4762-M5x50-10.9
(friction coefficient µ
total
= 0.12 – 0.17);
Tightening torque M
A
= 8.9 Nm ±10 %
Screw length as required
Required surface quality of the
valve mounting face
8/8 Bosch Rexroth AG Hydraulics (Z)DBT / DZT RE 25724/03.10
Bosch Rexroth AG
Hydraulics
Zum Eisengießer 1
97816 Lohr am Main, Germany
Phone +49 (0) 93 52 / 18-0
Fax +49 (0) 93 52 / 18-23 58
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 state-
ments 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.
Examples of application
Remote control
Alternative
Alternative
Pressure release, electric
2 pressure ratings
2. Pressure range
Block installation valves
Pressure release and 2
pressure stages
