9 cavitation coefficient z for 75% duty, 10 pressure-temperature-diagram, Breakaway torques – Richter NKLP-C Series Butterfly Valves User Manual
Page 10: Cavitation coefficient z for 75% duty, Pressure-temperature-diagram, Series nks-c, nksp-c, nkl-c, nklp-c, 8 breakaway torques
Series NKS-C, NKSP-C, NKL-C, NKLP-C
Page 10
9520-072-en
Revision 01
TM 8176
Edition 03/2011
1.8 Breakaway torques
Nom. size
Md
erf
Md
S
Md
H
Md
T
[mm]
[inch]
[Nm]
[Nm]
[Nm]
[Nm]
50
2“
26 159
103
105
65
2½"
36 159
103
105
80
3“
46 159
103
105
100
4“
60 335
216
222
125
5"
80 335
216
222
150
6“
110 608
393
402
200
8“
167 456
295
302
250
10“
278 664
457
469
300
12“
333 664
457
469
350
14“
450 1227
845
866
400
16“
500 1227
845
866
450
18"
600 1519
2004
2053
500
20"
650 1519
2004
2053
600
24"
890 3170
4181
4283
700
28"
1500 3170
4181
4283
750
30"
2000 5418
7147
7321
800
32"
2300 5418
7147
7321
900
36"
2700 5418
7147
7321
1000
40"
3400 10374
7147
7321
Md
erf
= incl. 10% safety Md
H
= Hastelloy stem
Md
S
= Stainless steel stem Md
T
= Titanium stem
1.9 Cavitation coefficient z for
75% duty
Nom. size
at kv/kvs = 75 %
[mm]
[inch]
z
50
2“
0,60
65
2½"
0,46
80
3“
0,47
100
4“
0,27
125
5"
0,40
150
6“
0,38
200
8“
0,29
250
10“
0,48
300
12“
0,45
350
14“
0,48
400
16“
0,56
450
18"
0,49
500
20"
0,49
600
24"
0,48
700
28"
0,29
750
30"
0,30
800
32"
0,30
900
36"
0,31
1000
40"
0,40
1.10 Pressure-temperature-diagram
When used in the minus temperature range, the regulations applicable in the country in question must be
observed.