
EB 2551-2 EN
3-5
Design and principle of operation
Table 3-1:
Technical data · All pressures in bar (gauge)
Valve size
DN
65
80
100
125
150
200
2)
250
2)
Pressure rating
PN 16, 25 or 40
Max. permissible temperature
150 °C
1)
Set point range (continuously
adjustable)
1 to 11 bar
Minimum diff. pressure ∆p
min
0.4 bar
0.5 bar
0.6 bar
Max. perm. differential pressure ∆p
16 bar
12 bar
10 bar
Max. perm. upstream pressure p
1
16 bar
Conformity
·
1)
Valve body made of cast iron (EN-GJL-250), DN 125 to 250: max. 130 °C, taking into account the
material table in DIN 4747-1 for the use of the regulator in hot-water district heating networks.
2)
DN 200 and 250 as well as set point range 1 to 16 bar (not typetested) available on request. It is
not possible to type test valves in DN 200 and 250 since the test specification only applies to
K
VS
380 at the maximum. However, their design and function are identical to those of the typetest
-
ed valve sizes.
Table 3-2:
K
VS
coefficients and x
FZ
values · Terms for noise level calculation according to
VDMA 24422 (edition 1.89)
Valve size
DN
65
80
100
125
150
200
250
K
VS
coefficient
50
80
125
190
280
420
500
Value at K
VS
0.3
1)
1.6
1.7
2.0
2.4
3.0
5.0
x
FZ
value
0.40
0.35
0.30
1)
Despite installing a strainer upstream of the regulator, dirt particles may impair the valve shut-off
depending on the size of the strainer mesh. On using the SAMSON Type 2 NI Strainer, the
maximum leakage rate may correspond to the specified value at K
VS
0.3 due to the clogging up of
the valve. This value is then significant on sizing the safety valve or safety excess pressure valve in
the plant.
Summary of Contents for 33-7
Page 12: ...1 8 EB 2551 2 EN ...
Page 14: ...2 2 EB 2551 2 EN ...
Page 22: ...3 8 EB 2551 2 EN ...
Page 34: ...5 8 EB 2551 2 EN ...
Page 38: ...7 2 EB 2551 2 EN ...
Page 48: ...11 2 EB 2551 2 EN ...
Page 50: ...12 2 EB 2551 2 EN ...
Page 52: ...13 2 EB 2551 2 EN ...
Page 57: ......