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コントロールユニット Jafar 4497のPDF 取扱説明書をオンラインで閲覧またはダウンロードできます。Jafar 4497 11 ページ。 Concentric butterfly valves
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DN
ISO
[mm]
5211
P/N
Δp
40
F05
50
F05
65
F05
80
F05
100
F07
125
F07
150
F07
200
F10
250
F10
300
F10
350
F10
400
F14
500
F14
600
F16
700
F25
800
F25
900
F25
1000
F25
1200
F30
Table 2. Operating torque values for gas media
* Applicable to networks which conduct chemically inert gases (e.g. air without oil). For the remaining gas group,
a separate document is available: "P/N 4497 Operating Manual for Gas Applications".
•
The minimum valve switchover time (to close or open) dependent on the DN size (nominal diameter) is listed
in Table 2:
Table 3. Minimum valve switchover time
The valve switchover time is the minimum time to close or open the valve connected to a pump which delivers a
medium. The time values listed in Table 2 are calculated with the following formula:
T –> switchover time (s)
L –> piping length (m)
2
g –> 9.81(m/s
)
h –> nominal pressure in metres of sweet water
column
The listed time values are calculated for: L=500(m), V= 4(m/s), k= 1.25. If the closing time is shorter, it is
mandatory to install water hammer dampers (and standard safety valves are unfit for this application).
OPERATING MANUAL
Closing/opening torque value on valve shaft required
for (Nm),
gas media*
1.0 [MPa]
110
156
329
438
625
1,313
1,719
3,469
5,000
9,219
11,719
13,281
15,625
17,188
DN (mm)
Switchover time (s)
40-350
400-600
700-800
900-1200
∙
=
∙ ℎ ∙ ( − 1)
k –> shockwave pressure rise factor, calculated in
07-2021
4497
16
24
31
43
66
10
16
40
50
∙ √
V –> flow rate (m/s)
relation to the nominal pressure (1-1.25)
1.6 [MPa]
24
35
43
70
94
156
219
368
506
781
1,594
2,344
4,000
5,781
11,719
14,063
17,188
19,531
22,031
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