p
A
[bar]
p
T
[bar]
50
40
30
35
25
20
15
10
5
32
6
31,5
36
q
Vmax
[l/min]
0
60
100
200
315
350
400
500
0
5
10
17
1
2
3
4
5
6
7
10/12
DBD
| Pressure relief valve
Bosch Rexroth AG
, RE 25710, edition: 2016-07
Characteristic curves:
Counter pressure in the discharge line
Diagram for determining the maximum counter pressure
p
T
in the discharge line at port T of the valve dependent on the
flow
q
Vmax
for valves DBD.
4
...1X/...E with different response pressures
p
A
.
p
A
Response pressure in bar
p
T
Maximum counter pressure in the discharge line (port T)
in bar
q
Vmax
Maximum flow in l/min
Determination of the maximum counter pressure
Example
(with already existing characteristic curve):
Flow of the system / accumulator to be secured:
q
Vmax
= 5 l/min
Safety valve set to:
p
A
= 500 bar.
Read off the maximum counter pressure
p
T
of approx. 36 bar from
the diagram (see arrows, characteristic curve 7).
Characteristic
curves
Response pressure
p
A
in bar
1
60
2
100
3
200
4
315
5
320
6
350
7
500
Characteristic curves for
intermediate values can be generated
by interpolation. Further
explanations can be found on
page 9.
