Data Sheet for Product

6/14
Siem ens Modulating control valves with magnetic actuator, PN 16 CE1N4361en
Building Technologies 2018-02-05
100 200 300 500 1000
[kPa]
p
1
0,20
0,42
0,30
0,15
0,10
0,05
p
v
p
1
1
0
0
[
%
]
m
[kg/h]
3 5 7
10
1
4
1 2 3 5 7 10 [bar]
2 3 5 7
10
2
4 2 3 5 7
10
3
4 2 3
k
V
S
3
0
k
V
S
1
,
5
k
V
S
3
k
V
S
5
k
V
S
8
k
V
S
1
2
k
V
S
2
0
k
V
S
0
,
6
b
a
MVF461H...
4361D 02
.
For saturated steam and superheated steam the differential pressure Χp
max
across the
valve should be close to the critical pressure ratio.
Pressure ratio = %100
p
pp
1
31
√
,
p
1
= absolute pressure before valve in kPa
p
3
= absolute pressure after valve in kPa
Subcritical range Supercritical range
%42%100
p
pp
1
31
;√
,
%42%100
P
pp
1
31
″√
,
Pressure ratio < 42% subcritical Pressure ratio ″ 42% supercritical
(not recommended)
k
ppp
m
k
vs
√
,√
√<
)(
.
313
24
%
k
p
m
k
vs
√√<
1
48
%
.
m
%
= steam quantity in kg/h
k = factor for superheating of steam = 1 + 0.0013 · ΧT (k = 1 for saturated steam)
ΧT = temperature differential in K between saturated steam and superheated steam
Example
given saturated steam 133.54 °C
p
1
= 300 kPa (3 bar)
m
%
= 110 kg/h
pressure ratio = 12 %
saturated steam 133.54 °C
p
1
= 300 kPa (3
bar)
m
%
= 110 kg/h
pressure ratio ≥ 42 %
(supercritical permitted)
required k
vs
, valve type k
vs
, valve type
procedure
100
12
1
13
p
pp
√
,<
).( barkPap 642264
100
30012
300
3
<
√
,<
h/m.
)(
.k
vs
3
7441
264300264
110
24 <√
,√
√<
hmk
vs
/,,
3
0831
300
110
48 <√√<
selected k
vs
= 5 m
3
/h  MVF461H20-5 k
vs
= 3 m
3
/h  MVF461H15-3
Saturated steam flow
chart
Recommendation
Calculation of the k
vs
value for steam