Bray 31U - Manual (Page 2)

Resilient Seated
Butterfly Valves
Technical Manual - Table of Contents
Topic Page(s)
Introduction to Torques ........................................3
Reduced Disc Diameter Bray Valves 30/31/3A ..6
Seating & Unseating Torques ..............................7
20/21, 30/31 Imperial (Lb-Ins) ...............................8
20/21, 30/31 Metric (N-m) ....................................9
32/33, 35/36 .........................................................10
Imperial (Lb-Ins) & Metric (N-m)
22/23 Imperial (Lb-Ins) & Metric (N-m) ................11
Dynamic Torque Factors
Imperial (Lb-In/psi) ................................................12
Metric (N-m/bar) ...................................................13
Valve Sizing Coefficients .................................. 14
Imperial (Cv) .........................................................15
Metric (Kv) ............................................................17
Flange to Valve Bolting Guide .............................19
Flange Bolt Tensioning Data ................................20
Standard Metal Specifications
20/21 & 22/23 .......................................................23
30/31, 31H, 3A/3AH, 31U ......................................24
32/33, 35/36, 35F, 36H ..........................................25
All statements, technical information, and recommendations in this bulletin are for
general use only. Consult Bray representatives or factory for the specific requirements
and material selection for your intended application. The right to change or modify
product design or product without prior notice is reserved.