EB 2512 EN
19
Design and principle of operation
Table 3:
K
VS
coefficients and x
FZ
values · Terms for noise level calculation according to
VDMA 24422 (edition 1.89)
Valve size
DN
15
20
25
32
40
50
65
80
100
K
VS
1)
· Standard version
4.0
6.3
8.0
16
20
32
50
80
125
x
FZ
0.5
0.45
0.4
0.35
K
VS
1)
· Special version
1.0
1.0 · 4.0
4.0 · 8.0
32
2)
80
x
FZ
0.6
0.5
0.45
0.4
K
VS
1)
· With flow divider
3.0
5.0
6.0
12
15
25
38
42
66
1)
K
VS
≤4: valve without balancing bellows
2)
Max. permissible ∆p: 25 bar
Table 4:
Materials · Material numbers according to DIN EN
Valve
Type 2412
Nominal pressure
PN 16
PN 25
PN 40
Max. permissible temperature
300 °C
350 °C
Body
Cast iron
EN-GJL-250
Spheroidal
graphite iron
EN-GJS-400-18-LT
Cast steel
1.0619
Stainless steel
1.4408
Seat
CrNi steel
CrNiMo steel
Plug
Material
CrNi steel
CrNiMo steel
Seal
PTFE with 15 % glass fiber · EPDM · NBR · FKM
Guide bushing
CrNi steel
Balancing bellows and bellows
seal
Stainless steel 1.4571
Actuator
Type 2413
Diaphragm actuator
Bellows actuator
Diaphragm cases
Sheet steel S 235 JR (St 37-2)
1)
–
Diaphragm
EPDM · FKM· NBR · EPDM
with PTFE protective facing
–
Bellows housing
–
1.5415/1.4301 (stainless steel only)
Bellows
–
1.4571
1)
In corrosion-resistant version (CrNi steel)
