Owner manual

Resilient Seated Butterfly Valves – Flange Bolt Tensioning Data
All information herein is proprietary and condential and may not be copied or reproduced without the expressed written consent of BRAY INTERNATIONAL, Inc.
The technical data herein is for general information only. Product suitability should be based solely upon customer’s detailed knowledge and experience with their application.
Mounting : 22
Series 22/23 Installation - Flange Bolt Torque Chart, 150 lb Flanges
Valve Size Normal Torque Range Max Torque Range
In mm Ft-lbs N-m Ft-lbs N-m
2 50 30 40 35 50
2.5 65 30 40 35 50
3 80 35 50 40 55
4 100 35 - 40 50 - 55 40 55
5 125 35 - 45 50 - 60 50 65
6 150 35 - 50 50 - 65 65 90
8 200 45 - 55 60 - 75 80 110
10 250 55 - 75 75 - 100 100 135
12 300 65 - 110 90 - 150 120 165
14 350 75 - 120 100 - 165 140 190
16 400 75 - 120 100 - 165 140 190
18 450 85 - 130 115 - 175 170 230
20 500 85 - 130 115 - 175 180 245
24 600 100 - 150 135 - 205 220 300
The torque values are based on using new, coarse-
threaded, lubricated fasteners. Up to 15% may be
added to the Normal Torque Range values when using
non-lubricated fasteners. However, the maximum
torque should not be exceeded.
Flange gaskets are normally not used for installation
of S22/23 valves. Flange leakage may be caused by
combination of out-of-parallel and/or misaligned
flanges, and surface damage on the flange face and/or
the face of the valve seat. In such cases, suitable flange
gaskets may be used to control flange leakage.
Torque values specified by manufacturers of certain
flanges, for example plastic flanges, could be lower than
the values specified above. In such cases, the flange
manufacturers’ torque values must not be exceeded.
Use flange gaskets if necessary to secure flange seal.