Manual RadiatoR ValVes -
MikrotherM
7
Diagram DN 32 (11/4“)
angle / straight
0121-05 / 0122-05
*) screwdriver rotations
Sample calculation
target: Preset value
Given:
Heat flow
º
= 2210 W
temperature spread
Δt = 20 K (70/50°C)
Pressure loss in manual valve dn 15 Δp
v
= 30 mbar
solution: Mass flow
ª
=
º
/ (c · Δt) = 2210 / (1,163 · 20) = 95 kg/h
screw driver turns from
diagram dn 15
= 6.5 turns
10
20 30
50
100
200 300 500
1000
2000
ª “
30
0,57
0,79
1,42 2,2
3,8
5,3
DM
æ 8,9
6,6
EM
æ 10,1
2
¥ /æ
60
50
30
20
10
5
3
2
1
0,1
0,2
0,3
0,5
∆
p
[kPa
]
3000 5000
50
30
3
4
5
6 7 8
10
12
12
7,9
600
500
300
200
100
20
10
1
2
3
5
6000
5000
3000
2000
1000
500
300
200
100
10
20
30
50
∆
p
[mm WS
]
∆
p
[mbar
]
*)
cv =
kv
0,86
kv = cv · 0,86
