14 | Baker Hughes
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Assembly Torque Requirements
Valve Size
ANSI
Class
Bolting Requirements
Torque Requirements
Minimum
Maximum
Pre-Load
inch
mm
Qty.
Size (inch)
Lbs.Ft
N.m
Lbs.Ft
N.m
Lbs.Ft
N.m
.75
& 1
20 &
25
150 & 300
4
1/2
"
-13NC-2A
25
34
66
89
5
7
600
4
1/2
"
-13NC-2A
25
34
66
89
5
7
900 & 1500
4
1
"
-8NC-2A
125
169
560
759
45
61
2500
4
1
"
-8NC-2A
125
169
560
759
45
61
1.5
& 2
40 &
50
150 & 300
8
1/2
"
-13NC-2A
25
34
66
89
5
7
600
8
1/2
"
-13NC-2A
25
34
66
89
5
7
900 & 1500
8
7/8"
-9NC-2A
100
136
300
407
30
41
1.5
40
2500
8
7/8"
-9NC-2A
100
136
300
407
30
41
2
50
2500
8
1-1/8
"
-7NC-2A
160
217
640
868
60
81
3
80
150 & 300
6
5/8"
-11NC-2A
45
61
132
179
10
14
600
8
3/4
"
-10NC-2A
80
108
230
312
20
27
900 & 1500
8
1-1/8
"
-8NC-2A
225
305
830
1125
75
102
4
100
150 & 300
8
5/8"
-11NC-2A
45
61
132
179
10
14
600
8
1
"
-8NC-2A
125
169
560
759
45
61
900 & 1500
8
1-1/2
"
-8NC-2A
400
542
2100
2847
115
156
6
150
150 & 300
12
5/8"
-11NC-2A
45
61
132
179
10
14
600
12
1
"
-8NC-2A
125
169
560
759
45
61
8
200
150 – 600
12
1-1/4
"
-8NC-2A
235
319
1200
1627
100
136
Notes: 1. Do not exceed Maximum Torque values listed.
2. Tighten in increments until required torque levels are reached.
3. Reject assembly if metal-to-metal contact is not achieved after reaching Maximum Torque.
4. Torque requirements shown are for standard B7 studs and 2H nuts.
Bellows Bonnet Assembly Torque Requirements
Bolting Requirements
Torque Requirements
Minimum
Maximum
Increments
Pre-Load
Qty.
Size (inch)
Lbs.Ft
N.m
Lbs.Ft
N.m
Lbs.Ft
N.m
Lbs.Ft
N.m
8
1/2
"
-13NC-2A
20
27
30
41
5
7
5
7
8
5/8"
-11NC-2A
25
34
55
75
10
14
5
7
Notes: 1. Do not exceed Maximum Torque values listed.
2. Tighten in increments noted until required torque levels are reached.
3. Torque requirements shown are for standard B7 studs and 2H nuts.
Valve
Size
mm
in.
25
&
40
1
&
1- 1/2
900
31
230
250
34
Min.
daN.m
Carbon Steel Bolting
Max.
Ft. Lbs.
daN.m
Ft. Lbs.
ANSI Class
Stud (9)
20 to 50 3/4 to 2
150 - 300
600
4,5
33
37
5
1/2” -13 NC - 2A
200
8
150 - 300
26
192
207
28
1- 1/4” - 8 NC - 2A
1
2
3
4
5
6
7
8
1
2
3
4
1
2
3
4
10
8
5
6
7
11
12
9
1
2
3
5
6
4
Size
Qty
8
12
1500
35
260
295
40
1” - 8 NC - 2A
4
2500
40
295
370
50
5,5
40
48
6,5
80
3
150
300
600
8
60
63
8,5
5/8” -11 NC - 2A
6
19
140
148
20
3/4” -10 NC - 2A
8
100
4
150 - 300
600
8,5
63
70
9,5
5/8” -11 NC - 2A
8
28
207
220
30
1” -8 NC - 2A
8
150
6
150 - 300
600
8,5
63
66
9
5/8” -11 NC - 2A
12
28
207
221
30
1” -8 NC - 2A
12
8
60
63
8,5
5/8” -11 NC - 2A
6
23
170
184
25
Min.
daN.m
Stainless Steel Bolting
Max.
Ft. Lbs.
daN.m
Ft. Lbs.
3,5
26
30
4
26
192
207
28
4,5
33
37
5
23 *
170 *
184 *
25 *
7
52
59
8
28
207
221
30
9
66
74
10
Req’d. Torque
28
207
221
30
*
Only on 21000 threaded tr
im valves. For quick-change tr
im valves, use following torques
.........
Figure 11 – Bolting Torques and Tightening Sequence