球墨鑄鐵管法蘭螺栓孔數(shù)
規(guī)格DN
mm
PN10
孔數(shù)
PN16
PN25
10
4
15
20
25
32
40
50
65
8
80
100
125
150
200
12
250
300
16
350
400
450
500
600
700
24
800
900
28
1000
1200
1400
36
1600
1800
44
2000
48