Standard - WEKA AG

WEKA AG, CH-8344 Bäretswil & CH-2300 La Chaux-de-Fonds, Switzerland
Phone +41 43 833 4343 - Fax +41 43 833 4329- Schürlistrasse 8, CH-8344 Bäretswil
Phone +41 32 925 97 00 - Fax +41 32 926 54 22 - Allée du Quartz 1, CH-2300 La Chaux-de-Fonds
WEKA Specification no. 19911004 – WEKA Cryogenic Valves
info@weka-ag.ch - www.weka-ag.ch
19. September 2007 - FHo / Page 6 of 7
Heat load by thermal conductivity of solids on cryogenic valves PN25 (Standard)
Heat load for any cryogenic length “h”:
I
L(h = )
IL(h = 875,300 K − K) × 875
=
( W )
h =
h
(mm)
DN2, DN4, DN6 600
875
DN8 600
875
DN10 600
875
DN15 600
875
DN20 600
875
DN25 600
875
DN32 600
875
DN40-36 600
875
DN40 600
875
DN50 600
875
DN65 600
875
DN80 875
1000
DN100 875
1000
DN125 875
1200
DN150 875
1200
I L (300K-4K)
(W)
0.28
0.19
0.42
0.29
0.48
0.33
0.69
0.47
0.94
0.64
1.37
0.94
1.54
1.06
2.19
1.50
2.92
2.01
3.79
2.60
5.35
3.67
5.24
4.58
7.35
6.41
10.08
7.24
14.51
10.39
I L (300K-20K)
(W)
0.27
0.19
0.41
0.28
0.47
0.32
0.68
0.46
0.93
0.63
1.36
0.93
1.53
1.05
2.18
1.49
2.91
1.99
3.77
2.59
5.32
3.65
5.21
4.56
7.31
6.37
10.03
7.21
14.44
10.34
I L (300K-77K)
(W)
0.25
0.17
0.37
0.26
0.43
0.30
0.62
0.42
0.84
0.58
1.23
0.84
1.38
0.95
1.97
1.35
2.62
2.33
3.40
2.33
4.79
3.29
4.69
4.11
6.65
5.79
9.14
6.56
13.18
9.42
L:\_Dokumentationen\Cryo_Datenblätter\_Originale\19911004-E-2002.doc