DBET; DBETE 1/10
RE 29 165/07.97
Overview of contents
Proportional pressure relief valve
Types DBET and DBETE
Nominal size 6
Series 5X
Maximum operating pressure 350 bar
Maximum flow 2 L/min
H/A/D 6079/98
Features
Contents Page
Features 1
Ordering details 2
Preferred types 2
Symbols 2
Function, section 3
Technical data 4 and 5
Electrical connections, control electronics 5 and 6
Characteristic curves 7 and 8
Unit dimensions 9
Type DBETE-5X/.G24K31…
with integrated control electronics
– Direct actuated valve for the limitation of a system pressure
– Actuated via a proportional solenoid
– For subplates:
Porting pattern to DIN 24 340, form A6
subplates to catalogue sheet RE 45 052,
(separate order, see page 9)
– Control electronics for type DBET:
• Amplifiers VT-VSPA1-1, VT-VSPD-1 and VT 2000 in Euro-
card format (separate order, see page 5)
• Amplifier type VT 11 030 of modular design
(separate order, see page 5)
– Integrated control electronics for type DBETE:
• Low sample spread of the command value-pressure
characteristic curve
• Independently adjustable up and down ramps
RE 29 165/12.98
Replaces: 07.97
RE 29 165/12.98
RE 29 165/07.97
Rexroth Hydraulics 2/10 DBET; DBETE
T
P
T
P
Ordering details
Symbols
Preferred types
Type DBETE
Material no. Type
00528808 DBETE-5X/50G24K31M
00560201 DBETE-5X/100G24K31M
00946670 DBETE-5X/200G24K31M
00936987 DBETE-5X/315G24K31M
For external control electronics (type DBET)
Further details in clear text
M = NBR seals,
suitable for mineral oils
(HL, HLP) to DIN 51 524
V = FKM seals
Electrical connections
for DBET:
K4 = With component plug DIN 43 650-AM2
Without plug-in connector
Plug-in connector – separate order,
see page 5
For DBETE:
K31 = With component plug to
E DIN 43 563-AM6-3
Without plug-in connector
Plug-in connector – separate order,
see page 5
G24 = Supply voltage for the
control electronics 24 V DC
Proportional
pressure reflief valve
For external control electronics = No code
With integrated control electronics = E
Series 50 to 59 = 5X
(50 to 59: unchanged installation and connection dimensions)
Pressure stage
Up to 50 bar =50
Up to 100 bar = 100
Up to 200 bar = 200
Up to 315 bar = 315
Up to 350 bar = 350
Special types of protecton on request!
DBET – 5X / G24
*
With integrated control electronics (type DBETE)
RE 29 165/12.98
DBET; DBETE 3/10 Rexroth Hydraulics
RE 29 165/07.97
P
T
2 1 4 3 3.1
5
6
Function, section
Type DBET (for external control electronics)
The type DBET proportional pressure relief valves are remote control
valves of poppet design and are used to limit a system pressure. They
are actuated by a proportional solenoid. With these valves, the system
pressure to be limited can be infinitely set in relationship to the
electrical command value.
These valves mainly consist of the housing (1), a proportional
solenoid (2), the valve seat (3) and the valve poppet (4).
The proptional solenoid converts electrical current proportionally into
a mechanical force. An increase of the current causes a proportionally
higher solenoid force. The armature chamber of the solenoid is filled
with pressure fluid and is pressure tight.
The setting of the system pressure is carried out command value-
dependent via the proportional solenoid (2). The solenoid force
pushes the valve poppet onto the seat (3). The pressure present in
port P of the system acts on the valve poppet (4) and thus against
the force of the proportional solenoid. If the hydraulic force on the
valve poppet (4) is equal to the solenoid force then the valve controls
the set pressure by lifting the valve poppet off the valve seat (3),
and thus permitting pressure fluid to flow from P to T. With minimum
control current, relates to the zero command value, the minimum
setting pressure is set.
Type DBETE (with integrated control electronics)
The function and design of these valves is the same as the type DBET.
The proportional solenoids are fitted with an additional housing (5)
which contains the control elelctronics. Supply and command value
voltages are applied at the component plug (6).
The command value-pressure characteristic curve (zero point at valve
seat (3.1) and the increase at the
I
max
potentiometer (R30) in the
control electronics) are factory pre-set with a low example spread.
The ramp time for pressure increase and decrease may be set
independently from each other at two potentiometers.
For further details regarding the integrated electronics see page 6.
RE 29 165/12.98
RE 29 165/07.97
Rexroth Hydraulics 4/10 DBET; DBETE
Technical data (for applications outside these parameters, please consult us!)
General
Installation optional
Storage temperature range °C – 20 to + 80
Ambient temperature range DBET °C – 20 to + 70
DBETE °C – 20 to + 50
Weight DBET kg 2
DBETE kg 2.1
Hydraulic (measured at
ν
= 41 mm
2
/s,
ϑ
= 50 °C)
Operating pressure (port P) bar max. permissible 350
Max. set pressure Pressure stage 50 bar bar 50
Pressure stage 100 bar bar 100
Pressure stage 200 bar bar 200
Pressure stage 315 bar bar 315
Pressure stage 350 bar bar 350
Min. settable pressure at 0 command value bar see characteristic curves on page 8
Return pressure (port T) separate and at zero pressure to tank
Flow L/min max. 2
Pressure fluid mineral oils (HL, HLP) to DIN 51 524
further pressure fluids on request!
Pressure fluid temperature range °C – 20 to + 80
Viscosity range mm
2
/s 15 to 380
Degree of contamination Max. permissible degree of Filter recommendation
contamination of the pressure with a minimum retention
fluid is to NAS 1638 rate of
β
x
≥ 75
class 9 x = 10
Hysteresis (see command value-pressure characteristic curve) ± 1.5 % of max. settable pressure
Repeatability < ± 2 % of max. settable pressure
Linearity ± 3.5 % of max. settable pressure
Example spread of the command value- DBET ± 2.5 % of max. settable pressure
pressure characteristic curves, referring
to the hysteresis characteristic curve,
pressure increasing DBETE ± 1.5 % of max. settable pressure
Switching time ms 30 bis 150 (system dependent)
RE 29 165/12.98
DBET; DBETE 5/10 Rexroth Hydraulics
RE 29 165/07.97
PE
12
PE
1
2
30
27,5
30
36
53
27,5
Ø22,5
A
B
C
D
E
F
Ø6,5…11
91
0,5
Technical data (for applications outside these parameters, please consult us!)
Electrical
Supply voltage 24 V DC
Min. control current DBET and DBETE mA 100
Max. control current DBET mA 800
DBETE mA 1600
Coil resistance Cold value at 20°C Ω 19.5 for DBET; 5,4 Ω for DBETE
Max. warm value Ω 28.8 for DBET; 7,8 Ω for DBETE
Duty continuous
Electrical connections DBET with component plug to DIN 43 650-AM2
1)
separate order, plug-in connector to DIN 43 650-AF2/Pg11
1)
see below DBETE with component plug to E DIN 43 563-AM6-3
plug-in component plug to E DIN 43 563-BF6-3/Pg11
1)
Valve protection to DIN 40 050 IP 65
Control electronics
– for DBETE integrated into the valve, see page 6
– For DBET
• Amplifier in Eurocard format analogue VT-VSPA1-1 to catalogue sheet RE 30 111
(separate order) VT 2000 to catalogue sheet RE 29 904
digital VT-VSPD-1 to catalogue sheet RE 30 123
• Amplifier of modular design (separate order) analogue VT 11 030 to catalogue sheet RE 29 741
Electrical connections
For type DBET (for external control electronics)
For type DBETE (with integrated control electronics)
For pin allocation see block circuit diagram on page 6
Plug-in connector to E DIN 43 563-BF6-3/Pg11
separate order under material no. 00021267
(plastic version)
Plug-in connector to DIN 43 650-AF2/Pg11
separate order under material no. 00074684
Connections at plug-in connector
To amplifier
Connections at component plug
(seal)
Note: For details regarding the environmental simulation test covering EMC (electro-magnetic compatibility), climate and
mechanical loading see RE 29 165-U (declaration regarding environmental compatibility).
RE 29 165/12.98
RE 29 165/07.97
Rexroth Hydraulics 6/10 DBET; DBETE
R 30 R 43
I
max
R 13
+
–
0 V
+U
+7,5 V
-7,5 V
+
R 14
+U
=
=
I
D
E
F
C
B
A
n.c.
I
min
U
U
300 Hz
=
MP1
MP2
n.c.
1,6 A =
0,352 V
22
24
26
28
30
20 40 60 80 100
0,75 mm
2
1 mm
2
Integrated electronics for type DBETE
Supply voltage
Power supply with rectification
Single phase rectification or three phase full bridge: U
eff
= 22 to 33 V
Residual ripple at power supply: < 5 %
Output current: I
eff
= max. 1.4 A
Supply cable: – Recommendation 5-core 0.75 or 1 mm
2
with
protective conductor and screen
– External diameter 6.5 to 11 mm
– Screen to 0 V supply voltage
– Max. permissible length 100 m
The minimum supply voltage at the power supply is dependent on
the length of the supply cable (see diagram).
With lengths > 50 m a capacitor of 2200 µF must be fitted in the
supply line near the valve.
0V ref. potential
Block circuit diagram / terminal allocation of the integrated electronics
The control of the integrated electronics is at the two differential
amplifier ports D and E.
The ramp generator produces a delayed increase or decrease of the
solenoid current from a command value jump (0 to 10 V or 10 to
0 V). The increase time may be set at potentiometer R14 and the
decrease time of the solenoid current at potentiometer R13.
The maximum ramp time of 5 s is only possible over the full command
value range. With smaller command value changes the ramp time
shortens correspondingly.
Via the characteristic curve generator,the command value solenoid
current characteristic curve is so matched to the valve that unlinearities
in the hydraulics are compensated for and a linear command value
pressure characteristic curve is obtained.
The current controller controls the solenoid current independent of
the solenoid coil resistance.
The increase of the command value-current characteristic curve and
thus also the increase of the command value-pressure characteristic
curve of the proportional pressure valve may be altered at the
potentiometer R30.
The potentiometer R43 is used for the setting the bias current. This
adjustment should not be altered. If necessary, the zero point of the
command value-pressure characteristic curve may be set at the valve
seat.
The power stage of the electronics for the control of the proportional
solenoid is in the form of a chopper amplifier. It is pulse width
modulated with a pulse frequency of 300 Hz.
The solenoid current may be measured at the test sockets MP1 and
MP2. A voltage drop of 0.352 V at the measuring resistance relates
to a solenoid current of 1.6 A.
Function
Com. value 0 to 10 V
Supply voltage:
U
eff
: 22 to 33 V
Chopper
amplifier
Ramp
"up"
Ramp
"down"
Internal ref. point
Measuring
resistance
R = 0.22 Ω
Oscillator
Solenoid
Power supply
Ramp
generator
Differential
amplifier
Characteristic
curve generator
Current
controller
0 V
Length of supply cable in m →
Min. supply voltage in V →
DBET; DBETE 7/10 Rexroth Hydraulics
RE 29 165/07.97
0 20 40 60 80 100
20
40
60
80
100
0 20 40 60 80 100
20
40
60
80
100
0 0,4 0,8 1,2 1,6 2,0
10
20
30
40
50
60
0 0,4 0,8 1,2 1,6 2,0
20
40
60
80
100
120
0 0,4 0,8 1,2 1,6 2,0
40
80
120
160
200
240
280
0 0,4 0,8 1,2 1,6 2,0
40
80
120
160
200
240
280
320
350
0 0,4 0,8 1,2 1,6 2,0
50
100
150
200
250
300
350
400
Characteristic curves (measured at
ν
= 41 mm
2
/s and
ϑ
=50°C)
Pressure stage 50 bar
Flow in L/min →
Pressure stage 200 bar
Pressure stage 100 bar
Pressure stage 315 bar
Pressure stage 350 bar
The characteristic curves were measured
without back pressure in port T.
Pressure in port P in bar →
Pressure in port P in % →
Pressure in port P in % →
Command value in % → Command value in % →
Pressure in port P in relation to the command value (q
V
= 0.8 L/min)
DBETEDBET
Pressure in port P in relation to the flow
Flow in L/min →
Pressure in port P in bar →
Flow in L/min →
Pressure in port P in bar →
Flow in L/min →
Pressure in port P in bar →
Flow in L/min →
Pressure in port P in bar →
RE 29 165/07.97
Rexroth Hydraulics 8/10 DBET; DBETE
0 0,4 0,8 1,2 1,6 2,0
0,5
1,0
1,5
2,0
2,5
0 0,4 0,8 1,2 1,6 2,0
0,5
1,0
1,5
2,0
2,5
0 0,4 0,8 1,2 1,6 2,0
0,5
1,0
1,5
2,0
2,5
0 0,4 0,8 1,2 1,6 2,0
1
2
3
4
5
0 0,4 0,8 1,2 1,6 2,0
1
2
3
4
5
Characteristic curves (measured at
ν
= 41 mm
2
/s and
ϑ
=50°C)
Min. settable pressure in port P with command value 0
Flow in L/min →
Min. settable pressure in bar →
Pressure stage 50 bar
Pressure stage 200 bar
Pressure stage 100 bar
Pressure stage 315 bar
Pressure stage 350 bar
Flow in L/min →
Min. settable pressure in bar →
Flow in L/min →
Min. settable pressure in bar →
Flow in L/min →
Min. settable pressure in bar →
Flow in L/min →
Min. settable pressure in bar →
The characteristic curves were measured
without back pressure in port T.
Note: So that the minimum settable pressure can be achieved the bias current must not exceed 100 mA.
DBET; DBETE 9/10 Rexroth Hydraulics
RE 29 165/07.97
0,01/100mm
R 4
max
65
2
1
4
7
75
22
49
86
15
Ø19,5
9
T
P
22
89
16,5
64
38
16,5
18,5
Ø 5,5
Ø 10
177,5
245,5
40,5
±0,1
0,75
45
1,5
31
±0,1
32,5
±0,1
T
P
Unit dimensions (Dimensions in mm)
Required surface finish of
mating piece
1 Proportional solenoid
2 Valve housing
3 Name plate
4 R-rings 9.81 x 1.5 x 1.78
5 Space required to remove the plug-in connector
6 Plug-in connector to DIN 43 650-AF2/Pg 11
(separate order, see page 5)
7 Integrated control electronics (type DBETE)
with component plug,
plug-in connector to E DIN 43 563-BF6-3/Pg11
(separate order, see page 5)
8 Blind counter bore
9 Porting pattern to DIN 24 340; form A6
Subplates to catalogue sheet RE 45 052 and valve fixing screws must
be separately ordered.
Subplates: G 341/01 (G 1/4)
G 342/01 (G 3/8)
G 502/01 (G 1/2)
Valve fixing screws: M5 x 30 DIN 912-10.9;
M
A
= 8.9 Nm
(with integrated control electronics)
RE 29 165/12.98
All rights reserved – Subject to revision 10/10 DBET; DBETE
RE 29 165/07.97
Mannesmann Rexroth AG
Rexroth Hydraulics
D-97813 Lohr am Main
Jahnstraße 3-5 • D-97816 Lohr am Main
Telefon 0 93 52 / 18-0
Telefax 0 93 52 / 18-23 58 • Telex 6 89 418-0
The specified data is for product description
purposes only and may not be deemed to be
guaranteed unless expressly confirmed in the
contract.
Mannesmann Rexroth Limited
Cromwell Road, St Neots,
Huntingdon, Cambs, PE19 2ES
Tel: (01480) 476041
Fax: (01480) 219052
Notes
RE 29 165/12.98
