Samson 33-7, Mounting And Operating Instructions, Page: 19 / 58

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.