Metso Neles BW Series, Installation Maintenance And Operating Instructions

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18 2 BW 70 en
10.8 Valve screws – Clamping torque
Permissible clamping torque for screws of category A193
Gr. B7(M) and A193 Gr. B8M2 with standard metric thread,
according to DIN 13. The values are only valid for standard
configuration.
Table 5 Tightening of gland packing
Shaft diameter at
packing [mm]
Body class Stud
Spring outside
diameter d [mm]
Compression
h1-h2 [mm]
Height uncompressed
h1 [mm]
Height compressed
h2 [mm]
30
900, 1500
M12 35.5
1.6
2.1
37.2
35.6
35.1
2500
35
900, 1500
1.6
2.1 35.6
35.1
2500
40
900, 1500
1.7
2.2 35.5
35
2500
45
900, 1500
M16 45
2.1
2.9
44
41.9
41.1
2500
50
900, 1500
2.4
2.9 41.6
41.1
2500
55
900, 1500
2.4
3.2 41.6
40.8
2500
65
900, 1500
M20 50
2.3
2.7
50.4
48.1
47.7
2500
70
900, 1500
2.3
2.9 48.1
47.5
2500
75
900, 1500
2.3
3
48.1
47.4
2500
85
900, 1500
2.6
3.5 47.8
46.9
2500
95
900, 1500
M30 71
3.4
4.5
69.4
66
64.9
2500
105
900, 1500
3.7
4.9 65.7
64.5
2500
120 900, 1500 4.2 65.2
135 900, 1500 4.7 64.7
Table 6 Clamping torque, for standard configuration only
Thread
Cover tube & cover plate Sealing element
Clamping torque / Nm Preload force / N Clamping torque / Nm Preload force / N
M8x1,25 15 9900 21 14000
M10x1,5 29 15400 41 22000
M12x1,75 51 22900 72 32500
M16x2 123 42100 175 60000
M20x2,5 240 65900 340 94000
M24x3 416 95000 590 125500
M30x3,5 830 151000 1180 215700
M36x4 1440 220000 2050 314000
M42x4,5 2300 303000 3250 432800
M48x5 3450 396000 4900 565700
M56x5,5 5500 545000 7800 778500