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KTM VIRGO SERIES N TRUNNION MOUNTED BALL VALVES
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
14 RECOMMENDED TIGHTENING TORQUES
FOR FASTENERS AND PLUGS
NOTES
1. Ensure that all the nuts/bolts are tightened to the
torque values as specified in below Tables.
2. Torque values for carbon and low alloy steel
material are for dry and non-lubricated fasteners.
3. Torque values for austenitic stainless steel
material are with anti-seize lubricant.
4. Apply pipe thread sealant to the threads of the
drain and vent plugs.
5. 1 Nm = 0.737 ft·lb
FOR METRIC SERIES (Nm)
Thread size
(Metric)
Pitch
L7M, B7M
M8
1.25
M10
1.50
M12
1.75
M14
2.00
M16
2.00
M18
2.50
M20
2.50
M22
2.50
M24
3.00
M27
3.00
M30
3.50
M33
3.50
M36
4.00
M39
4.00
M42
4.50
M45
4.50
M48
5.00
M52
5.00
M56
5.50
M60
5.50
Non-coated bolts / nuts
Low resistance bolt /
stud material
B8M
B8M
Class 1
Class 2
15
6
18
30
11
36
52
19
62
83
31
99
126
47
150
174
65
207
243
91
289
327
122
327
415
155
415
601
224
492
814
303
511
1097
409
688
1410
526
884
1810
675
1135
2241
835
1406
2780
1036
1744
3348
1248
2100
4298
1602
2696
5343
1991
3352
6624
2469
4155
High resistance bolt /
stud material
L7, B7
Gr 660
L7M, B7M
20
16
40
32
69
55
108
88
165
134
228
185
103
318
258
143
428
348
191
544
441
245
787
639
351
1066
866
477
1436
1167
639
1845
1500
824
2370
1925
1052
2934
2384
1306
3639
2957
1613
4383
3561
1948
5626
4572
2488
6995
5683
3098
8671
7046
3824
Coated bolts / nuts
Low resistance bolt /
stud material grade
B8M
B8M
Class 1
Class 2
9
3
11
18
7
21
31
12
37
49
18
58
74
28
88
38
123
53
143
71
191
91
200
131
287
178
299
238
401
307
517
392
660
487
819
601
1012
726
1222
927
1561
1155
1943
1425
2399
High resistance bolt /
stud material
L7, B7
Gr 660
12
10
24
19
40
33
64
52
97
79
135
110
187
152
250
203
320
261
459
373
625
507
836
680
1078
876
1377
1119
1710
1389
2112
1716
2571
2072
3257
2646
4056
3295
5006
4067
22
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