Recommended practices, calculations, and data for correctly specifying and using butterfly valves in any water piping system. Second edition.

Updated from the 2001 edition, this new manual has expanded equations for eccentricity torque, added torque sign conventions and double offset disc design varia

"The purpose of this manual is to present a recommended method for calculating operating torque, head loss, and cavitation for quarter-turn valves typically use

Recommended methods for calculating operating torque, head loss, and cavitation for quarter-turn valves typically used in water works service. M49 also provides