0 valve maintenance – Flowserve Cast Globe Valves User Manual
Page 16
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Globe Valves FCD ADENIM0011-00
16
5.0 VALVE MAINTENANCE
(Continued)
5.5
Bolting Torque Values
At regular intervals not-more than six-months, check the tightness of all bolting. Bolted bonnet valves should have
the body-bonnet bolting torqued to the values shown in Table 1.
1.
Torque values specified on certified assembly drawings always superseded this manual.
2.
The maximum torque values are provided for guidance in field work where higher torques may be required
because of material conditions such as rust and oxides.
TABLE 1
BODY - BONNET BOLTING TORQUE (ft-lb)
Maximum
The following torque values are provided for guidance in field work. The torque values provided for design were developed using an
assumed friction coefficient of 0.2. These maximum torque valves provide for a range of friction coefficients without damage to the
designated bolting material.
A193
A193
A564
A453
A574
STUD SIZE
B7 - B16
B8 &B8M
630-1100
660
5/16 - 18
11
6.5
13
12
15
3/8 - 16
20
12
23
20
26
7/16 -14
30
19
36
30
44
1/2 - 13
45
28
55
50
67
9/16 -12
70
40
80
70
-
5/8 - 11
90
56
110
100
130
3/4 - 10
165
100
195
165
230
7/8 - 9
270
160
310
280
375
1 - 8
400
240
470
420
560
1 1/8 - 8
600
350
690
600
800
1 ¼ - 8
800
500
970
850
1140
1 3/8 - 8
1100
675
1320
1200
1500
1 ½ - 8
1500
900
1750
1600
1970
1 5/8 - 8
1900
1150
2250
2000
-
1 ¾ - 8
2400
1450
2850
2500
3100
1 7/8 - 8
3000
1800
3500
3200
-
2 - 8
3700
2200
4300
3900
4600
2 1/8 - 8
4400
2650
5200
4700
-
2 ¼ - 8
5300
3200
6200
5600
6900
2 ½ - 8
7400
4400
8600
8000
9400
2 ¾ - 8
8700
5900
11600
10400
12800
3 - 8
11400
7800
15200
13000
16900