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HIGH PERFORMANCE BUTTERFLY VALVE
FIGURE HPA
15
Thread size
(inch)
Torque
(Nm)
3/8
18–25
1/2
46–65
9/16
67–95
5/8
170–190
3/4
252–280
7/8
342–380
1
460–508
1-1/8
594–660
1-1/4
756–840
1-3/8
1054–1544
1-1/2
1125–1250
1-5/8
1752–2575
1-3/4
2194–3228
1-7/8
2704–3984
2
3288–4849
Table 3
Tightening torque values
APPENDIX A
TECHNICAL INFORMATION
A1. References
Design/pressure-temperature ratings
API 609
Butterfly Valves: Lug- and wafer-type
ASME B 16.34
Valves: flanged, threaded and welding ends
Face-to-face dimensions
API 609
Face-to-face and end-to-end dimensions of valves
End connections
ASME B16.5
Pipe flanges and flanged fittings (NPS 1/2 through NPS 24)
ASME B16.47
Large diameter steel flanges (NPS 26 through NPS 60)
Fire test
API 607
Fire test for soft seated quarter-turn valves
A2. Tightening sequence and torque
Tighten bolts evenly and diagonally opposite to each other or in a crisscross pattern.
Use the torque figures as shown in Table 3.
Fig. 8
Tightening sequence for 12 bolts
