User Manual

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Siemens Control device PN25, safety function to DIN EN 14597 CE1N4389en
Building Technologies 10.01.2011
Sizing
Δp
max
= Maximum permissible differential pressure across the valve, valid for the entire actuating
range of the motorized valve
Δp
v100
= Differential pressure across the fully open valve and the valve’s control path by a volume
flow V
100
V

100
= Volume flow through the fully open valve (H
100
)
100 kPa = 1 bar ≈ 10 mWC
1 m
3
/h = 0.278 l/s water at 20 °C
Flow k
v
/ k
vs
0,8
0,6
0,4
0,2
0
1
0 0,2 0,4 0,6 0,8 1
Stroke H / H
100
0…30 % → linear
30…100 % → equal percentage
n
gl
= 3 as per
VDI / VDE 2173
Flow diagram
Valve flow
characteristic