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9.3 Operation with counter pressure in the discharge line
In principle, the safety valve should be operated without counter pressure in the
discharge line, if possible. In case of counter pressure in the discharge line, the
maximum flow possible is reduced. There is a relationship between maximum
admissible counter pressure p
seen from the following diagrams. Characteristic curves for intermediate values
of the response pressure which are not listed must be determined by means of
interpolation.
When the flow approaches zero, the maximum admissible counter pressure p
in each case 10% of the response pressure. With increasing flow, the maximum
admissible counter pressure p
9.3.1 Operation with counter pressure in the discharge line of type DBD.4K1X/..E
Fig. 1: Diagram DBD.4K1X/..E
Diagram for determining the maximum admissible counter pressure p
discharge line at port T of the safety valve dependent on the flow q
valves DBD.4K1X/..E with different response pressures p
p
Response pressure in bar
A
Maximum admissible counter pressure in the discharge line (port T) in bar
p
T
q
Maximum flow in l/min
Vmax
Area I Interpolation area I, for valves DBD.4K1X/..E with response pressure
p
=60...315 bar and maximum flow q
A
Area II Interpolation area II, for valves DBD.4K1X/..E with response pressure
p
=320...500 bar and maximum flow q
A
in the discharge line and flow q
T
decreases.
T
=10 l/min
Vmax
=17 l/min
Vmax
RE 25402-B/10.21, DBD...1X/..E, Bosch Rexroth AG
Operation
35/56
, which can be
V
is
T
in the
T
for safety
Vmax
A
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