RESILIENT-SEATED CARTRIDGE STYLE
FNW7XX
BUTTERFLY VALVE
INSTALLATION INSTRUCTIONS
FNW.COM
We reserve the right to modify or improve the designs or
specifications of our products at any time without notice.
9
Piping Bolt Tightening Procedure
•
Clean the bolts and nuts and apply lubricant to them.
•
Do not use rusty or damaged bolts and nuts.
•
Tighten the bolts and nuts by hands. Tighten the bolts and nuts in any desired order with approx. 20% of specified tightening torque.
•
Tighten the bolts and nuts, alternate diagonally with approx. 70% of the specified tightening torque.
•
Tightening the bolts and nuts, alternate diagonally with approx. 100% of the specified tightening torque.
•
Bolts that are tightened once may become loose due to stress relaxation of the piping gaskets. Be sure to perform re-tightening
repeatedly until the bolts and nuts are tightened evenly.
RECOMMENDED BOLT TIGHTENING TORQUE (CLASS 150) FOR METAL FLANGE
Size of Valve
Inch
Size of Bolt
Recommended Torque
ft/lbs
2"
5/8" 13UNC
40
2-1/2"
5/8" 13UNC
40
3"
5/8" 13UNC
40
4"
5/8" 13UNC
40
5"
3/4" 10UNC
50
6"
3/4" 10UNC
50
8"
3/4" 10UNC
50
10"
7/8" 9 UNC
80
12"
7/8" 9 UNC
80
14"
1" 8 UNC
120
16"
1" 8 UNC
120
18"
1-1/8" 7 UNC
200
20"
1-1/8" 7 UNC
200
24"
1-1/4" 7 UNC
260
28"
1-1/4" 7 UNC
260
30"
1-1/4" 7 UNC
260
32"
1-1/2" 6 UNC
440
36"
1-1/2" 6 UNC
440
40"
1-1/2" 6 UNC
440
42"
1-1/2" 6 UNC
440
48"
1-1/2" 6 UNC
440
NOTICE:
These values above are for the class 150 Metal Flange only and it is recommended to use the minimum torque as higher
torque can increase the compression on the valve seat. If using thermoplastic flange such as PVC, refer to the thermoplastic
manufacturers recommended bolt torque value.