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Interpolation of
intermediate values from
the diagram
Example 1 with
already existing
characteristic curve
Example 2 with
interpolated
characteristic curve
9.3.1 Counter pressure diagram DB(W)10...5X/...E
Diagram for determining the maximum admissible counter pressure p
discharge line at tank port T of the valve dependent on the flow q
DB(W)10...5X/...E with different response pressures p
discharge.
Table 13: Counter pressure diagram DB(W)10...5X/...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
Area I Interpolation area I, for valves DB(W)10...5X/...E with response pressure
p
=30...60 bar and maximum flow q
A
Area II Interpolation area II, for valves DBD(W)10...5X/...E with response pressure
p
=65...300 bar and maximum flow q
A
1.
At the axis referred to as p
2.
From the marked point, draw a straight line within the interpolation area to the
zero position flow on the axis referred to as q
area I and/or 200 l/min for interpolation area II).
3.
Mark the system flow to be secured at the axis referred to as q
4.
Read off the maximum admissible counter pressure for this value using the line at
the axis referred to as p
Flow of the system / accumulator to be secured: q
Safety valve set to: p
= 350 bar
A
Read off the maximum admissible counter pressure of approx. 26 bar from the
diagram (see arrows, characteristic curve 6).
Flow of the system / accumulator to be secured: q
Safety valve set to: p
= 150 bar
A
Value to be marked at the axis referred to as p
=130 l/min
Vmax
=200 l/min
Vmax
, mark 1/10 of the value of response pressure p
T
Vmax
drawn before.
T
Vmax
Vmax
: 1/10 · 150 bar = 15 bar,
T
RE25802-B/09.19, DB(W)...5X/...E, Bosch Rexroth AG
Operation
in the
T
for valves
Vmax
with internal pilot oil
A
(here 130 /min for interpolation
.
Vmax
= 50 l/min
= 50 l/min
35/56
.
A
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