This video with Miami-Dade (FL) Fire Captain Bill Gustin examines the function and requirements for valves that control the flow of water into fire suppression systems and onto a fire.
ALSO
Video: Fire Suppression Systems, Part 1: Follow the Water
Standpipe Operations: Preparation
Standpipe Operations: Stretching and Advancing Hose
Standpipe Operations, Part 1: Preparing for Fire Attack