Bray 31U - Manual (Page 19)

Resilient Seated Butterfly Valves – Flange to Valve Bolting Guide
All information herein is proprietary and confidential 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 : 19
Note: Please refer to Appropriate Bray Technical
Drawings for Dimensions and Bolting information
for the highlighted holes.
ASME Class 150 = 26” Valves and larger
ASME Class 300 = 14” Valves and larger
ASME Class 650 = 10” Valves and larger
Valve Body
Raised
Face
Flange
Raised
Face
Flange
Washer Washer
**Minimum Bolt
Engagement
Must Be Equal to
Diameter of Bolt
** Lug Style Bolting
** Wafer Style Bolting
Valve Body
Raised
Face
Flange
Flange Width
Including Raise Face
If Necessary
Washer
Width
Bolt
Length
Minimum Bolt
Engagement
Equal to
Bolt Diameter
++ + =
Flange Width
Including Raise Face
If Applicable
Washer
Width
+ + =
Please refer to ASME B-16.5 or B-16.47 for Flange and Bolt Dimension Information
Valve Face to Face
Washer Washer
Flat Face
Flange
Flat Face
Flange
Washer Washer
Overall
Length
+ Flange
Width x2
Including Raise Face
If Applicable
Washer
Width
x2
Width
of Nut
x2
4 Threads
(2 Per Side)
+ =
** Note: Please refer to Appropriate
Bray Dimensional Drawings for
specific valve drilling information
on Wafer and Lug Valves 20” and larger.
Examples of Typical Flange to Valve Bolting*
* Double flange style bolting not shown.
** Lug threads may be tapped from both sides and therefore tap may not be continuous.
+