Flowserve Cast Globe Valves - Manual (Page 16)

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 Torque values specified on certified assembly drawings always superseded this manual.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