3
Siemens
N4212en
Smart Infrastructure
2019-06-04
Sizing
Flow diagram:
40
25
16
10
6,3
2,5
1,6
1
4
63
Low
n
o
is
e
o
p
e
ra
ti
o
n
---
Δ
p
max
for VAG61.. and VBG61.., for details, see table on equipment combinations
Δ
p
max
= Maximum permissible differential pressure over the ball valve, valid for the entire
positioning range of the ball valve rotary actuator unit; if low noise operation is desired, we
recommend a maximum permissible differential pressure of 200 kPa
Δ
p
v100
= Differential pressure over the fully opened ball valve and over the control path at a volume
flow V
100
100
= Volume flow through the fully opened ball valve
100 kPa
= 1 bar
≈
10 mWS
1 m
3
/h
= 0.278 l/s water at 20 °C
