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Example with already
existing characteristic
curve (DBA40...1X/...E)
9.3.2 Counter pressure diagram DBA40...1X/...E
Diagram for determining the maximum admissible counter pressure p
discharge line at tank port T of the valve dependent on the flow q
DBA40...1X/...E with different response pressures p
discharge.
p
p
T
A
in bar
in bar
Table 17: Counter pressure diagram DBA40...1X/...E
p
response pressure in bar
A
p
maximum admissible counter pressure in the discharge line (port T) in bar
T
q
maximum flow in l/min
Vmax
p
10 % x p
(with q
Tmax
A
Table 18: Assignment characteristic curve - response pressure p
Characteristic curve
1
2
3
4
5
6
7
8
Characteristic curves for intermediate values can be generated by interpolation.
Flow of the system / accumulator to be secured: q
Safety valve set to: p
= 350 bar
A
See arrows in diagram:
p
(320 l/min; 350 bar) = 16.2 bar
T
= 0 l/min)
V
30
60
65
110
115
210
215
350
RE 25880-B/10.18, DBA...1X/...E, Bosch Rexroth AG
Operation
in the
T
for valves
Vmax
with internal pilot oil
A
A
Response pressure p
in bar
A
= 320 l/min
Vmax
37/56
q
in l/min
Vmax
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