7.4 - Dimensioning of the Dilution Water Valve
68
SBT-2400 Appendix
M2041/5en
©BTG 2006
NOTE!
Use the curve for 85º valve opening when calculating the correction factor.
EXAMPLE:
Calculated K
v
-value = 75.4
Pipe line dimension = 60 mm. (D)
Selected valve size 50 (d)
which has a K
v
-value of 130 at 75º opening.
Check that selected valve K
v
is sufficient, see Fig 15.
= 1.2 which gives a correction factor of 0.78
The valve K
v
will be 0.80 x 130 = and the valve size 50 is sufficient.
0,7
0,4
0,5
0,6
0,3
0,8
0,9
1,0
1
2
3
4
5
D
d
a
°
= 85
d
D
a
A
a
°
= 80
a
°
= 75
a
°
= 70
Fig 13 Correction factor for
reduced bores
Correction factor
d = valve bore
D = Pipe line diameter
α
= opening
D
d
----
