4
Siemens
N4212en
Smart Infrastructure
2019-06-04
Ball valve characteristic curve
Through-port
Flow rate k
v
/ k
vs
0,8
0,6
0,4
0,2
0
1
0
20
40
60
80 90°
4
2
1
1
D
0
3
a
Rotational angle
Flow characteristics
0…100 %
-> A
─
AB equal percentage, n
gl
= 3.9 per VDI / VDE 2173
3-port
Flow rate k
v
/ k
vs
0,8
0,6
0,4
0,2
0
1
0
20
40
60
80 90°
4
2
1
1
D
0
2
a
Rotational angle
Through-port
0…100 %
-> A
─
AB equal percentage, n
gl
= 3.9 per VDI / VDE 2173
Bypass
0…100 %
-> B
─
AB linear, k
vs
greater than 70 % of A
─
AB
