Flowserve 1878 Double-Disc Gate Valve - Manual (Page 16)

16
11.0 BOLTING TORQUE VALUES
At intervals of 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 below:
Torque (ft-lb)
STUD SIZE SA193-B7 SA453-660
Nominal Maximum Nominal Maximum
5/8-11 59 90 50 100
3/4-10
104 165 88 175
NOTE: The above table provides nominal design torque values and maximum torque
values using an assumed friction coefficient of 0.2. The maximum torque values provide for
material conditions such as rust and oxides that exist after equipment is in service.
All torque values listed shall be measured in foot-pounds.