7 pressure-temperature-diagram, 9 cavitation coefficient z for 75% duty, Pressure-temperature-diagram – Richter NKP Series Butterfly Valves User Manual
Page 7: Breakaway torques, Cavitation coefficient z for 75% duty, 8 breakaway torques
400
16“
97,0
69,0
--
--
15,0
Actuator see data of the manufacturer
1.7 Pressure-temperature-diagram
When used in the area of application of ASME,
the low temperature of ASTM A395 is limited to
– 20 °F (– 29 °C).
A special material is used for the disc/stem unit for
operating limits under °+ 14° F to – 76 °F
(– 10 °C to – 60 °C).
When used in the minus temperature range,
the regulations applicable in the country in
question must be observed.
According to AD 2000
According to ASME B16.42
1.8 Breakaway torques
Nom. size
Md
erf
Md
max
[mm]
[inch]
[Nm]
[Nm]
50
2“
20
100
80
3“
46
180
100
4“
63
360
150
6“
128
725
200
8“
185
775
250
10“
287
1435
300
12“
410
1775
350
14“
550
3000
400
16“
650
3500
1.9 Cavitation coefficient z for
75% duty
Nom. size
(bei kv/kvs = 75 %)
[mm]
[inch]
z
50
2“
0,32
80
3“
0,30
100
4“
0,29
150
6“
0,26
200
8“
0,23
250
10“
0,19
300
12“
0,16
350
14“
0,14
400
16“
0,12