Samson 2479, Mounting And Operating Instructions

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EB 3132-3 EN 3-7
Design and principle of operation
Table 3-1: Technical data · Valve · All pressures in bar (gauge)
Valve size DN 15 20 25 32 1) 40 1) 50 1)
K
VS
coefficient
Body with
screwed ends
0.4 2) 1.0 2) 2.5 4.0 2) 6.3 8.0 12.5 16.0 20.0
Flanged body – 12.5 20.0 25.0
x
FZ
value
Body with
screwed ends
0.6 0.55 0.5 0.45
Flanged body – 0.45 0.4
Pressure rating PN 25
Max. permissible differential pressure
∆p across the valve
20 bar 16 bar
Max. permissible valve temperature Liquids 150 °C
Differential pressure set point Adjusted to 0.2 bar
Conformity
1)
Additional version: valve with flanged body made of spheroidal graphite iron (EN-GJS-400-18-LT)
2)
Special version
Table 3-2: Flow rate set point ranges
Flow rate set point ranges
V
for water in m³/h
Δp
set point
Δp
plant
+ Δp
restriction
Δp
plant
Calculation
for plant
Δp
restriction
Differential
pressure
across the
restriction
DN 15 20 25 32 40 50
K
VS
0.4 1) 1.0 1) 2.5 4.0 1) 6.3 8.0 12.5 16.0 20.0
V
min.
0.01 0.12 0.2 0.5 0.8 0.8 2 3 4
0.2 bar 0.1 bar 0.1 bar
V
max.
0.14 0.45 0.85 1.8 2.6 3.6 7.1 8.5 10.7
0.3 bar 0.1 bar 0.2 bar V
max.
0.2 0.64 1.2 2.5 3.6 4.2 10.0 12.5 15.0
– 1.3 2) 2.3 2) 3.5 2) 5.8 2) 9.1 2) 14.1 2)
1) Special version
2)
An increase in noise level can be expected when the specified flow rate is exceeded, even if cavita -
tion does not occur (see AGFW (German District Heating Association) document FW 514).
See Fig. 3-3 to calculate the minimum required differential pressure Δpmin between the flow
pipe and return flow pipe .